Replace NotNullAttribute with thrown exceptions

samples/MvcSample.Web/project.json

@@ -18,15 +18,7 @@
         "Microsoft.AspNet.Server.WebListener": "1.0.0-*",
         "Microsoft.AspNet.Session": "1.0.0-*",
         "Microsoft.AspNet.StaticFiles": "1.0.0-*",
-        "Microsoft.Framework.Configuration.Json": "1.0.0-*",
-        "Microsoft.Framework.PropertyHelper.Sources": {
-            "version": "1.0.0-*",
-            "type": "build"
-        },
-        "Microsoft.Framework.NotNullAttribute.Sources": {
-            "type": "build",
-            "version": "1.0.0-*"
-        }
+        "Microsoft.Framework.Configuration.Json": "1.0.0-*"
     },
     "frameworks": {
         "dnx451": { },

samples/TagHelperSample.Web/project.json

@@ -15,9 +15,7 @@
     "Microsoft.AspNet.Server.IIS": "1.0.0-*",
     "Microsoft.AspNet.Server.WebListener": "1.0.0-*",
     "Microsoft.AspNet.StaticFiles": "1.0.0-*",
-    "Microsoft.AspNet.Tooling.Razor": "1.0.0-*",
-    "Microsoft.Framework.NotNullAttribute.Sources": { "type": "build", "version": "1.0.0-*" },
-    "Microsoft.Framework.PropertyHelper.Sources": { "version": "1.0.0-*", "type": "build" }
+    "Microsoft.AspNet.Tooling.Razor": "1.0.0-*"
   },
   "frameworks": {
     "dnx451": { },

src/Microsoft.AspNet.Mvc.TagHelpers/AnchorTagHelper.cs

@@ -147,14 +147,15 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 TagBuilder tagBuilder;
                 if (Route == null)
                 {
-                    tagBuilder = Generator.GenerateActionLink(linkText: string.Empty,
-                                                              actionName: Action,
-                                                              controllerName: Controller,
-                                                              protocol: Protocol,
-                                                              hostname: Host,
-                                                              fragment: Fragment,
-                                                              routeValues: routeValues,
-                                                              htmlAttributes: null);
+                    tagBuilder = Generator.GenerateActionLink(
+                        linkText: string.Empty,
+                        actionName: Action,
+                        controllerName: Controller,
+                        protocol: Protocol,
+                        hostname: Host,
+                        fragment: Fragment,
+                        routeValues: routeValues,
+                        htmlAttributes: null);
                 }
                 else if (Action != null || Controller != null)
                 {

src/Microsoft.AspNet.Mvc.ViewFeatures/Controller.cs

@@ -104,8 +104,8 @@ namespace Microsoft.AspNet.Mvc
         /// </summary>
         /// <remarks>
         /// <see cref="Controllers.IControllerActivator"/> activates this property while activating controllers.
-       ///  If user code directly instantiates a controller, the getter returns an empty
-       /// <see cref="Mvc.ActionContext"/>.
+        ///  If user code directly instantiates a controller, the getter returns an empty
+        /// <see cref="Mvc.ActionContext"/>.
         /// </remarks>
         [ActionContext]
         public ActionContext ActionContext
@@ -147,10 +147,13 @@ namespace Microsoft.AspNet.Mvc
 
                 return _metadataProvider;
             }
-
-            [param: NotNull]
             set
             {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
                 _metadataProvider = value;
             }
         }
@@ -169,10 +172,13 @@ namespace Microsoft.AspNet.Mvc
 
                 return _url;
             }
-
-            [param: NotNull]
             set
             {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
                 _url = value;
             }
         }
@@ -191,10 +197,13 @@ namespace Microsoft.AspNet.Mvc
 
                 return _objectValidator;
             }
-
-            [param: NotNull]
             set
             {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
                 _objectValidator = value;
             }
         }
@@ -259,10 +268,13 @@ namespace Microsoft.AspNet.Mvc
 
                 return _tempData;
             }
-
-            [param: NotNull]
             set
             {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
                 _tempData = value;
             }
         }
@@ -525,8 +537,13 @@ namespace Microsoft.AspNet.Mvc
         /// <remarks>Callers should cache an instance of <see cref="JsonSerializerSettings"/> to avoid
         /// recreating cached data with each call.</remarks>
         [NonAction]
-        public virtual JsonResult Json(object data, [NotNull] JsonSerializerSettings serializerSettings)
+        public virtual JsonResult Json(object data, JsonSerializerSettings serializerSettings)
         {
+            if (serializerSettings == null)
+            {
+                throw new ArgumentNullException(nameof(serializerSettings));
+            }
+
             var disposableValue = data as IDisposable;
             if (disposableValue != null)
             {
@@ -981,8 +998,13 @@ namespace Microsoft.AspNet.Mvc
         /// </summary>
         /// <returns>The created <see cref="BadRequestObjectResult"/> for the response.</returns>
         [NonAction]
-        public virtual BadRequestObjectResult HttpBadRequest([NotNull] ModelStateDictionary modelState)
+        public virtual BadRequestObjectResult HttpBadRequest(ModelStateDictionary modelState)
         {
+            if (modelState == null)
+            {
+                throw new ArgumentNullException(nameof(modelState));
+            }
+
             return new BadRequestObjectResult(modelState);
         }
 
@@ -993,8 +1015,13 @@ namespace Microsoft.AspNet.Mvc
         /// <param name="value">The content value to format in the entity body.</param>
         /// <returns>The created <see cref="CreatedResult"/> for the response.</returns>
         [NonAction]
-        public virtual CreatedResult Created([NotNull] string uri, object value)
+        public virtual CreatedResult Created(string uri, object value)
         {
+            if (uri == null)
+            {
+                throw new ArgumentNullException(nameof(uri));
+            }
+
             var disposableValue = value as IDisposable;
             if (disposableValue != null)
             {
@@ -1011,14 +1038,19 @@ namespace Microsoft.AspNet.Mvc
         /// <param name="value">The content value to format in the entity body.</param>
         /// <returns>The created <see cref="CreatedResult"/> for the response.</returns>
         [NonAction]
-        public virtual CreatedResult Created([NotNull] Uri uri, object value)
+        public virtual CreatedResult Created(Uri uri, object value)
         {
+            if (uri == null)
+            {
+                throw new ArgumentNullException(nameof(uri));
+            }
+
             var disposableValue = value as IDisposable;
             if (disposableValue != null)
             {
                 Response.RegisterForDispose(disposableValue);
             }
-            
+
             return new CreatedResult(uri, value);
         }
 
@@ -1119,8 +1151,12 @@ namespace Microsoft.AspNet.Mvc
         /// </summary>
         /// <param name="context">The action executing context.</param>
         [NonAction]
-        public virtual void OnActionExecuting([NotNull] ActionExecutingContext context)
+        public virtual void OnActionExecuting(ActionExecutingContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
         }
 
         /// <summary>
@@ -1128,8 +1164,12 @@ namespace Microsoft.AspNet.Mvc
         /// </summary>
         /// <param name="context">The action executed context.</param>
         [NonAction]
-        public virtual void OnActionExecuted([NotNull] ActionExecutedContext context)
+        public virtual void OnActionExecuted(ActionExecutedContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
         }
 
         /// <summary>
@@ -1141,9 +1181,19 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> instance.</returns>
         [NonAction]
         public virtual async Task OnActionExecutionAsync(
-            [NotNull] ActionExecutingContext context,
-            [NotNull] ActionExecutionDelegate next)
+            ActionExecutingContext context,
+            ActionExecutionDelegate next)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (next == null)
+            {
+                throw new ArgumentNullException(nameof(next));
+            }
+
             OnActionExecuting(context);
             if (context.Result == null)
             {
@@ -1160,9 +1210,14 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public virtual Task<bool> TryUpdateModelAsync<TModel>(
-            [NotNull] TModel model)
+            TModel model)
             where TModel : class
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
             return TryUpdateModelAsync(model, prefix: string.Empty);
         }
 
@@ -1177,10 +1232,20 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public virtual Task<bool> TryUpdateModelAsync<TModel>(
-            [NotNull] TModel model,
-            [NotNull] string prefix)
+            TModel model,
+            string prefix)
             where TModel : class
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            if (prefix == null)
+            {
+                throw new ArgumentNullException(nameof(prefix));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(
@@ -1204,11 +1269,26 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public virtual Task<bool> TryUpdateModelAsync<TModel>(
-            [NotNull] TModel model,
-            [NotNull] string prefix,
-            [NotNull] IValueProvider valueProvider)
+            TModel model,
+            string prefix,
+            IValueProvider valueProvider)
             where TModel : class
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            if (prefix == null)
+            {
+                throw new ArgumentNullException(nameof(prefix));
+            }
+
+            if (valueProvider == null)
+            {
+                throw new ArgumentNullException(nameof(valueProvider));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(
@@ -1243,11 +1323,21 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public Task<bool> TryUpdateModelAsync<TModel>(
-            [NotNull] TModel model,
+            TModel model,
             string prefix,
-            [NotNull] params Expression<Func<TModel, object>>[] includeExpressions)
+            params Expression<Func<TModel, object>>[] includeExpressions)
            where TModel : class
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            if (includeExpressions == null)
+            {
+                throw new ArgumentNullException(nameof(includeExpressions));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(
@@ -1282,11 +1372,21 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public Task<bool> TryUpdateModelAsync<TModel>(
-            [NotNull] TModel model,
+            TModel model,
             string prefix,
-            [NotNull] Func<ModelBindingContext, string, bool> predicate)
+            Func<ModelBindingContext, string, bool> predicate)
             where TModel : class
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            if (predicate == null)
+            {
+                throw new ArgumentNullException(nameof(predicate));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(
@@ -1323,12 +1423,27 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public Task<bool> TryUpdateModelAsync<TModel>(
-            [NotNull] TModel model,
+            TModel model,
             string prefix,
-            [NotNull] IValueProvider valueProvider,
-            [NotNull] params Expression<Func<TModel, object>>[] includeExpressions)
+            IValueProvider valueProvider,
+            params Expression<Func<TModel, object>>[] includeExpressions)
            where TModel : class
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            if (valueProvider == null)
+            {
+                throw new ArgumentNullException(nameof(valueProvider));
+            }
+
+            if (includeExpressions == null)
+            {
+                throw new ArgumentNullException(nameof(includeExpressions));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(
@@ -1364,12 +1479,27 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public Task<bool> TryUpdateModelAsync<TModel>(
-            [NotNull] TModel model,
+            TModel model,
             string prefix,
-            [NotNull] IValueProvider valueProvider,
-            [NotNull] Func<ModelBindingContext, string, bool> predicate)
+            IValueProvider valueProvider,
+            Func<ModelBindingContext, string, bool> predicate)
             where TModel : class
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            if (valueProvider == null)
+            {
+                throw new ArgumentNullException(nameof(valueProvider));
+            }
+
+            if (predicate == null)
+            {
+                throw new ArgumentNullException(nameof(predicate));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(
@@ -1403,10 +1533,20 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public virtual Task<bool> TryUpdateModelAsync(
-            [NotNull] object model,
-            [NotNull] Type modelType,
+            object model,
+            Type modelType,
             string prefix)
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            if (modelType == null)
+            {
+                throw new ArgumentNullException(nameof(modelType));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(
@@ -1442,12 +1582,32 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="Task"/> that on completion returns <c>true</c> if the update is successful.</returns>
         [NonAction]
         public Task<bool> TryUpdateModelAsync(
-            [NotNull] object model,
-            [NotNull] Type modelType,
+            object model,
+            Type modelType,
             string prefix,
-            [NotNull] IValueProvider valueProvider,
-            [NotNull] Func<ModelBindingContext, string, bool> predicate)
+            IValueProvider valueProvider,
+            Func<ModelBindingContext, string, bool> predicate)
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            if (modelType == null)
+            {
+                throw new ArgumentNullException(nameof(modelType));
+            }
+
+            if (valueProvider == null)
+            {
+                throw new ArgumentNullException(nameof(valueProvider));
+            }
+
+            if (predicate == null)
+            {
+                throw new ArgumentNullException(nameof(predicate));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(
@@ -1478,8 +1638,13 @@ namespace Microsoft.AspNet.Mvc
         /// <returns><c>true</c> if the <see cref="ModelState"/> is valid; <c>false</c> otherwise.</returns>
         [NonAction]
         public virtual bool TryValidateModel(
-            [NotNull] object model)
+            object model)
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
             return TryValidateModel(model, prefix: null);
         }
 
@@ -1492,9 +1657,14 @@ namespace Microsoft.AspNet.Mvc
         /// <returns><c>true</c> if the <see cref="ModelState"/> is valid;<c>false</c> otherwise.</returns>
         [NonAction]
         public virtual bool TryValidateModel(
-            [NotNull] object model,
+            object model,
             string prefix)
         {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
             if (BindingContext == null)
             {
                 var message = Resources.FormatPropertyOfTypeCannotBeNull(

src/Microsoft.AspNet.Mvc.ViewFeatures/DependencyInjection/MvcViewFeaturesMvcBuilderExtensions.cs

@@ -1,9 +1,8 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
 using Microsoft.AspNet.Mvc;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.Framework.DependencyInjection
 {
@@ -18,9 +17,19 @@ namespace Microsoft.Framework.DependencyInjection
         /// <param name="builder">The <see cref="IMvcBuilder"/>.</param>
         /// <param name="setupAction">The <see cref="MvcViewOptions"/> which need to be configured.</param>
         public static IMvcBuilder AddViewOptions(
-            [NotNull] this IMvcBuilder builder,
-            [NotNull] Action<MvcViewOptions> setupAction)
+            this IMvcBuilder builder,
+            Action<MvcViewOptions> setupAction)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (setupAction == null)
+            {
+                throw new ArgumentNullException(nameof(setupAction));
+            }
+
             builder.Services.Configure(setupAction);
             return builder;
         }

src/Microsoft.AspNet.Mvc.ViewFeatures/DependencyInjection/MvcViewFeaturesMvcCoreBuilderExtensions.cs

@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
@@ -11,24 +11,38 @@ using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Mvc.ViewFeatures.Internal;
 using Microsoft.Framework.DependencyInjection.Extensions;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
 
 namespace Microsoft.Framework.DependencyInjection
 {
     public static class MvcViewFeaturesMvcCoreBuilderExtensions
     {
-        public static IMvcCoreBuilder AddViews([NotNull] this IMvcCoreBuilder builder)
+        public static IMvcCoreBuilder AddViews(this IMvcCoreBuilder builder)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
             builder.AddDataAnnotations();
             AddViewServices(builder.Services);
             return builder;
         }
 
         public static IMvcCoreBuilder AddViews(
-            [NotNull] this IMvcCoreBuilder builder,
-            [NotNull] Action<MvcViewOptions> setupAction)
+            this IMvcCoreBuilder builder,
+            Action<MvcViewOptions> setupAction)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (setupAction == null)
+            {
+                throw new ArgumentNullException(nameof(setupAction));
+            }
+
             builder.AddDataAnnotations();
             AddViewServices(builder.Services);
 
@@ -41,9 +55,19 @@ namespace Microsoft.Framework.DependencyInjection
         }
 
         public static IMvcCoreBuilder ConfigureViews(
-            [NotNull] this IMvcCoreBuilder builder,
-            [NotNull] Action<MvcViewOptions> setupAction)
+            this IMvcCoreBuilder builder,
+            Action<MvcViewOptions> setupAction)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (setupAction == null)
+            {
+                throw new ArgumentNullException(nameof(setupAction));
+            }
+
             builder.Services.Configure(setupAction);
             return builder;
         }

src/Microsoft.AspNet.Mvc.ViewFeatures/IViewComponentResult.cs

@@ -3,7 +3,6 @@
 
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.ViewComponents;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc
 {
@@ -16,7 +15,7 @@ namespace Microsoft.AspNet.Mvc
         /// Executes the result of a <see cref="ViewComponent"/> using the specified <paramref name="context"/>.
         /// </summary>
         /// <param name="context">The <see cref="ViewComponentContext"/> for the current component execution.</param>
-        void Execute([NotNull] ViewComponentContext context);
+        void Execute(ViewComponentContext context);
 
         /// <summary>
         /// Asynchronously executes the result of a <see cref="ViewComponent"/> using the specified
@@ -24,6 +23,6 @@ namespace Microsoft.AspNet.Mvc
         /// </summary>
         /// <param name="context">The <see cref="ViewComponentContext"/> for the current component execution.</param>
         /// <returns>A <see cref="Task"/> that represents the asynchronous execution.</returns>
-        Task ExecuteAsync([NotNull] ViewComponentContext context);
+        Task ExecuteAsync(ViewComponentContext context);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/Internal/ICanHasViewContext.cs

@@ -2,12 +2,11 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
 {
     public interface ICanHasViewContext
     {
-        void Contextualize([NotNull] ViewContext viewContext);
+        void Contextualize(ViewContext viewContext);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/Internal/NullView.cs

@@ -1,10 +1,10 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
 {
@@ -14,8 +14,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
 
         public string Path => string.Empty;
 
-        public Task RenderAsync([NotNull] ViewContext context)
+        public Task RenderAsync(ViewContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             return Task.FromResult(0);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Internal/ValidationHelpers.cs

@@ -5,8 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.AspNet.Mvc.ModelBinding;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
 {
@@ -62,8 +60,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
         {
             private Dictionary<string, int> _ordering = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
 
-            public ErrorsOrderer([NotNull] ModelMetadata metadata)
+            public ErrorsOrderer(ModelMetadata metadata)
             {
+                if (metadata == null)
+                {
+                    throw new ArgumentNullException(nameof(metadata));
+                }
+
                 foreach (var data in metadata.Properties)
                 {
                     _ordering[data.PropertyName] = data.Order;

src/Microsoft.AspNet.Mvc.ViewFeatures/MvcViewOptions.cs

@@ -1,12 +1,11 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Collections.Generic;
 using Microsoft.AspNet.Mvc.ModelBinding.Validation;
-using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc
 {
@@ -15,10 +14,24 @@ namespace Microsoft.AspNet.Mvc
     /// </summary>
     public class MvcViewOptions
     {
+        private HtmlHelperOptions _htmlHelperOptions = new HtmlHelperOptions();
+
         /// <summary>
-        /// Gets or sets programmatic configuration for the HTML helpers and <see cref="ViewContext"/>.
+        /// Gets or sets programmatic configuration for the HTML helpers and <see cref="Rendering.ViewContext"/>.
         /// </summary>
-        public HtmlHelperOptions HtmlHelperOptions { get;[param: NotNull] set; } = new HtmlHelperOptions();
+        public HtmlHelperOptions HtmlHelperOptions
+        {
+            get { return _htmlHelperOptions; }
+            set
+            {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
+                _htmlHelperOptions = value;
+            }
+        }
 
         /// <summary>
         /// Gets a list <see cref="IViewEngine"/>s used by this application.

src/Microsoft.AspNet.Mvc.ViewFeatures/PartialViewResult.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Threading.Tasks;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 using Microsoft.Net.Http.Headers;
 using Microsoft.Framework.OptionsModel;
@@ -54,8 +53,13 @@ namespace Microsoft.AspNet.Mvc
         public MediaTypeHeaderValue ContentType { get; set; }
 
         /// <inheritdoc />
-        public override async Task ExecuteResultAsync([NotNull] ActionContext context)
+        public override async Task ExecuteResultAsync(ActionContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var viewEngine = ViewEngine ??
                              context.HttpContext.RequestServices.GetRequiredService<ICompositeViewEngine>();
 

src/Microsoft.AspNet.Mvc.ViewFeatures/RemoteAttribute.cs

@@ -11,7 +11,6 @@ using Microsoft.AspNet.Mvc.Internal;
 using Microsoft.AspNet.Mvc.ModelBinding.Validation;
 using Microsoft.AspNet.Routing;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 using Microsoft.AspNet.Mvc.Routing;
 
 namespace Microsoft.AspNet.Mvc
@@ -192,8 +191,13 @@ namespace Microsoft.AspNet.Mvc
         /// </summary>
         /// <param name="context">The <see cref="ClientModelValidationContext"/> used to generate the URL.</param>
         /// <returns>The URL where the client should send a validation request.</returns>
-        protected virtual string GetUrl([NotNull] ClientModelValidationContext context)
+        protected virtual string GetUrl(ClientModelValidationContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var urlHelper = context.RequestServices.GetRequiredService<IUrlHelper>();
             var url = urlHelper.RouteUrl(new UrlRouteContext()
             {
@@ -230,8 +234,13 @@ namespace Microsoft.AspNet.Mvc
         /// Thrown if unable to generate a target URL for a validation request.
         /// </exception>
         public virtual IEnumerable<ModelClientValidationRule> GetClientValidationRules(
-            [NotNull] ClientModelValidationContext context)
+            ClientModelValidationContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var metadata = context.ModelMetadata;
             var rule = new ModelClientValidationRemoteRule(
                 FormatErrorMessage(metadata.GetDisplayName()),

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperDisplayExtensions.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Linq.Expressions;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -37,8 +36,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent Display([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent Display(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(expression, templateName: null, htmlFieldName: null, additionalViewData: null);
         }
 
@@ -73,10 +77,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent Display(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(
                 expression,
                 templateName: null,
@@ -111,10 +120,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent Display(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string templateName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(expression, templateName, htmlFieldName: null, additionalViewData: null);
         }
 
@@ -150,11 +164,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent Display(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string templateName,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(
                 expression,
                 templateName,
@@ -193,11 +212,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent Display(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string templateName,
             string htmlFieldName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(expression, templateName, htmlFieldName, additionalViewData: null);
         }
 
@@ -221,9 +245,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent DisplayFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DisplayFor<TResult>(
                 expression,
                 templateName: null,
@@ -257,10 +291,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent DisplayFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DisplayFor<TResult>(
                 expression,
                 templateName: null,
@@ -290,10 +334,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent DisplayFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string templateName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DisplayFor<TResult>(
                 expression,
                 templateName,
@@ -328,11 +382,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent DisplayFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string templateName,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DisplayFor<TResult>(
                 expression,
                 templateName,
@@ -366,11 +430,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent DisplayFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string templateName,
             string htmlFieldName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DisplayFor<TResult>(
                 expression,
                 templateName: templateName,
@@ -394,8 +468,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent DisplayForModel([NotNull] this IHtmlHelper htmlHelper)
+        public static IHtmlContent DisplayForModel(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(
                 expression: null,
                 templateName: null,
@@ -424,8 +503,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent DisplayForModel([NotNull] this IHtmlHelper htmlHelper, object additionalViewData)
+        public static IHtmlContent DisplayForModel(this IHtmlHelper htmlHelper, object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(
                 expression: null,
                 templateName: null,
@@ -450,8 +534,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent DisplayForModel([NotNull] this IHtmlHelper htmlHelper, string templateName)
+        public static IHtmlContent DisplayForModel(this IHtmlHelper htmlHelper, string templateName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(
                 expression: null,
                 templateName: templateName,
@@ -483,10 +572,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent DisplayForModel(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string templateName,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(
                 expression: null,
                 templateName: templateName,
@@ -517,10 +611,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent DisplayForModel(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string templateName,
             string htmlFieldName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(
                 expression: null,
                 templateName: templateName,
@@ -556,11 +655,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent DisplayForModel(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string templateName,
             string htmlFieldName,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Display(
                 expression: null,
                 templateName: templateName,

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperDisplayNameExtensions.cs

@@ -4,8 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -19,8 +17,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </summary>
         /// <param name="htmlHelper">The <see cref="IHtmlHelper"/> instance this method extends.</param>
         /// <returns>A <see cref="string"/> containing the display name.</returns>
-        public static string DisplayNameForModel([NotNull] this IHtmlHelper htmlHelper)
+        public static string DisplayNameForModel(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.DisplayName(expression: null);
         }
 
@@ -36,9 +39,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A <see cref="string"/> containing the display name.</returns>
         public static string DisplayNameFor<TModelItem, TResult>(
-            [NotNull] this IHtmlHelper<IEnumerable<TModelItem>> htmlHelper,
-            [NotNull] Expression<Func<TModelItem, TResult>> expression)
+            this IHtmlHelper<IEnumerable<TModelItem>> htmlHelper,
+            Expression<Func<TModelItem, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DisplayNameForInnerType<TModelItem, TResult>(expression);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperEditorExtensions.cs

@@ -4,8 +4,6 @@
 using System;
 using System.Linq.Expressions;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -38,8 +36,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent Editor([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent Editor(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(expression, templateName: null, htmlFieldName: null, additionalViewData: null);
         }
 
@@ -55,8 +58,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <param name="additionalViewData">
         /// An anonymous <see cref="object"/> or <see cref="System.Collections.Generic.IDictionary{string, object}"/>
-        /// that can contain additional view data that will be merged into the <see cref="ViewDataDictionary{TModel}"/>
-        /// instance created for the template.
+        /// that can contain additional view data that will be merged into the
+        /// <see cref="ViewFeatures.ViewDataDictionary{TModel}"/> instance created for the template.
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element(s).</returns>
         /// <remarks>
@@ -74,10 +77,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent Editor(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(
                 expression,
                 templateName: null,
@@ -111,8 +119,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent Editor([NotNull] this IHtmlHelper htmlHelper, string expression, string templateName)
+        public static IHtmlContent Editor(this IHtmlHelper htmlHelper, string expression, string templateName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(expression, templateName, htmlFieldName: null, additionalViewData: null);
         }
 
@@ -129,8 +142,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="templateName">The name of the template used to create the HTML markup.</param>
         /// <param name="additionalViewData">
         /// An anonymous <see cref="object"/> or <see cref="System.Collections.Generic.IDictionary{string, object}"/>
-        /// that can contain additional view data that will be merged into the <see cref="ViewDataDictionary{TModel}"/>
-        /// instance created for the template.
+        /// that can contain additional view data that will be merged into the
+        /// <see cref="ViewFeatures.ViewDataDictionary{TModel}"/> instance created for the template.
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element(s).</returns>
         /// <remarks>
@@ -148,11 +161,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent Editor(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string templateName,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(
                 expression,
                 templateName,
@@ -191,11 +209,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent Editor(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string templateName,
             string htmlFieldName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(expression, templateName, htmlFieldName, additionalViewData: null);
         }
 
@@ -219,9 +242,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent EditorFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.EditorFor(expression, templateName: null, htmlFieldName: null, additionalViewData: null);
         }
 
@@ -234,8 +267,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="expression">An expression to be evaluated against the current model.</param>
         /// <param name="additionalViewData">
         /// An anonymous <see cref="object"/> or <see cref="System.Collections.Generic.IDictionary{string, object}"/>
-        /// that can contain additional view data that will be merged into the <see cref="ViewDataDictionary{TModel}"/>
-        /// instance created for the template.
+        /// that can contain additional view data that will be merged into the
+        /// <see cref="ViewFeatures.ViewDataDictionary{TModel}"/> instance created for the template.
         /// </param>
         /// <typeparam name="TModel">The type of the model.</typeparam>
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
@@ -251,10 +284,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent EditorFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.EditorFor(
                 expression,
                 templateName: null,
@@ -284,10 +327,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent EditorFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string templateName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.EditorFor(expression, templateName, htmlFieldName: null, additionalViewData: null);
         }
 
@@ -301,8 +354,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="templateName">The name of the template that is used to create the HTML markup.</param>
         /// <param name="additionalViewData">
         /// An anonymous <see cref="object"/> or <see cref="System.Collections.Generic.IDictionary{string, object}"/>
-        /// that can contain additional view data that will be merged into the <see cref="ViewDataDictionary{TModel}"/>
-        /// instance created for the template.
+        /// that can contain additional view data that will be merged into the
+        /// <see cref="ViewFeatures.ViewDataDictionary{TModel}"/> instance created for the template.
         /// </param>
         /// <typeparam name="TModel">The type of the model.</typeparam>
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
@@ -318,11 +371,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent EditorFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string templateName,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.EditorFor(
                 expression,
                 templateName,
@@ -356,11 +419,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent EditorFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string templateName,
             string htmlFieldName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.EditorFor(expression, templateName, htmlFieldName, additionalViewData: null);
         }
 
@@ -380,8 +453,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent EditorForModel([NotNull] this IHtmlHelper htmlHelper)
+        public static IHtmlContent EditorForModel(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(
                 expression: null,
                 templateName: null,
@@ -396,8 +474,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="htmlHelper">The <see cref="IHtmlHelper"/> instance this method extends.</param>
         /// <param name="additionalViewData">
         /// An anonymous <see cref="object"/> or <see cref="System.Collections.Generic.IDictionary{string, object}"/>
-        /// that can contain additional view data that will be merged into the <see cref="ViewDataDictionary{TModel}"/>
-        /// instance created for the template.
+        /// that can contain additional view data that will be merged into the
+        /// <see cref="ViewFeatures.ViewDataDictionary{TModel}"/> instance created for the template.
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element(s).</returns>
         /// <remarks>
@@ -410,8 +488,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent EditorForModel([NotNull] this IHtmlHelper htmlHelper, object additionalViewData)
+        public static IHtmlContent EditorForModel(this IHtmlHelper htmlHelper, object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(
                 expression: null,
                 templateName: null,
@@ -436,8 +519,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// case-sensitive file systems.
         /// </para>
         /// </remarks>
-        public static IHtmlContent EditorForModel([NotNull] this IHtmlHelper htmlHelper, string templateName)
+        public static IHtmlContent EditorForModel(this IHtmlHelper htmlHelper, string templateName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(
                 expression: null,
                 templateName: templateName,
@@ -454,8 +542,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="templateName">The name of the template used to create the HTML markup.</param>
         /// <param name="additionalViewData">
         /// An anonymous <see cref="object"/> or <see cref="System.Collections.Generic.IDictionary{string, object}"/>
-        /// that can contain additional view data that will be merged into the <see cref="ViewDataDictionary{TModel}"/>
-        /// instance created for the template.
+        /// that can contain additional view data that will be merged into the
+        /// <see cref="ViewFeatures.ViewDataDictionary{TModel}"/> instance created for the template.
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element(s).</returns>
         /// <remarks>
@@ -469,10 +557,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent EditorForModel(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string templateName,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(
                 expression: null,
                 templateName: templateName,
@@ -503,10 +596,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent EditorForModel(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string templateName,
             string htmlFieldName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(
                 expression: null,
                 templateName: templateName,
@@ -527,8 +625,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <param name="additionalViewData">
         /// An anonymous <see cref="object"/> or <see cref="System.Collections.Generic.IDictionary{string, object}"/>
-        /// that can contain additional view data that will be merged into the <see cref="ViewDataDictionary{TModel}"/>
-        /// instance created for the template.
+        /// that can contain additional view data that will be merged into the
+        /// <see cref="ViewFeatures.ViewDataDictionary{TModel}"/> instance created for the template.
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element(s).</returns>
         /// <remarks>
@@ -542,11 +640,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent EditorForModel(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string templateName,
             string htmlFieldName,
             object additionalViewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Editor(
                 expression: null,
                 templateName: templateName,

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperFormExtensions.cs

@@ -1,8 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
+using System;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -22,8 +21,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <remarks>
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
-        public static MvcForm BeginForm([NotNull] this IHtmlHelper htmlHelper)
+        public static MvcForm BeginForm(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             // Generates <form action="{current url}" method="post">.
             return htmlHelper.BeginForm(actionName: null, controllerName: null, routeValues: null,
                                         method: FormMethod.Post, htmlAttributes: null);
@@ -41,8 +45,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <remarks>
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
-        public static MvcForm BeginForm([NotNull] this IHtmlHelper htmlHelper, FormMethod method)
+        public static MvcForm BeginForm(this IHtmlHelper htmlHelper, FormMethod method)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginForm(actionName: null, controllerName: null, routeValues: null,
                                         method: method, htmlAttributes: null);
         }
@@ -65,10 +74,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             FormMethod method,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginForm(actionName: null, controllerName: null, routeValues: null,
                                         method: method, htmlAttributes: htmlAttributes);
         }
@@ -91,8 +105,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <remarks>
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
-        public static MvcForm BeginForm([NotNull] this IHtmlHelper htmlHelper, object routeValues)
+        public static MvcForm BeginForm(this IHtmlHelper htmlHelper, object routeValues)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginForm(actionName: null, controllerName: null, routeValues: routeValues,
                                         method: FormMethod.Post, htmlAttributes: null);
         }
@@ -111,10 +130,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string actionName,
             string controllerName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginForm(actionName, controllerName, routeValues: null,
                                         method: FormMethod.Post, htmlAttributes: null);
         }
@@ -140,11 +164,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string actionName,
             string controllerName,
             object routeValues)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginForm(actionName, controllerName, routeValues,
                                         FormMethod.Post, htmlAttributes: null);
         }
@@ -164,11 +193,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string actionName,
             string controllerName,
             FormMethod method)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginForm(actionName, controllerName, routeValues: null,
                                         method: method, htmlAttributes: null);
         }
@@ -195,12 +229,17 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string actionName,
             string controllerName,
             object routeValues,
             FormMethod method)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginForm(actionName, controllerName, routeValues,
                                         method, htmlAttributes: null);
         }
@@ -225,12 +264,17 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string actionName,
             string controllerName,
             FormMethod method,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginForm(actionName, controllerName, routeValues: null,
                                         method: method, htmlAttributes: htmlAttributes);
         }
@@ -253,8 +297,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <remarks>
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
-        public static MvcForm BeginRouteForm([NotNull] this IHtmlHelper htmlHelper, object routeValues)
+        public static MvcForm BeginRouteForm(this IHtmlHelper htmlHelper, object routeValues)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginRouteForm(
                 routeName: null,
                 routeValues: routeValues,
@@ -274,8 +323,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <remarks>
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
-        public static MvcForm BeginRouteForm([NotNull] this IHtmlHelper htmlHelper, string routeName)
+        public static MvcForm BeginRouteForm(this IHtmlHelper htmlHelper, string routeName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginRouteForm(
                 routeName,
                 routeValues: null,
@@ -303,10 +357,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginRouteForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string routeName,
             object routeValues)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginRouteForm(routeName, routeValues, FormMethod.Post, htmlAttributes: null);
         }
 
@@ -324,10 +383,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginRouteForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string routeName,
             FormMethod method)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginRouteForm(routeName, routeValues: null, method: method, htmlAttributes: null);
         }
 
@@ -352,11 +416,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginRouteForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string routeName,
             object routeValues,
             FormMethod method)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginRouteForm(routeName, routeValues, method, htmlAttributes: null);
         }
 
@@ -379,11 +448,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static MvcForm BeginRouteForm(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string routeName,
             FormMethod method,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.BeginRouteForm(
                 routeName,
                 routeValues: null,

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperInputExtensions.cs

@@ -4,8 +4,6 @@
 using System;
 using System.Linq.Expressions;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -23,8 +21,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; elements.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set checkbox
-        /// element's "name" attribute. Sanitizes <paramref name="expression"/> to set checkbox element's "id"
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// checkbox element's "name" attribute. Sanitizes <paramref name="expression"/> to set checkbox element's "id"
         /// attribute.
         /// </para>
         /// <para>Determines checkbox element's "checked" attribute based on the following precedence:</para>
@@ -34,8 +32,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// fully-qualified name) if entry exists and can be converted to a <see cref="bool"/>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="bool"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="bool"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -50,8 +48,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// value "checked" if the <see cref="bool"/> values is <c>true</c>; does not include the attribute otherwise.
         /// </para>
         /// </remarks>
-        public static IHtmlContent CheckBox([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent CheckBox(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.CheckBox(expression, isChecked: null, htmlAttributes: null);
         }
 
@@ -65,8 +68,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; elements.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set checkbox
-        /// element's "name" attribute. Sanitizes <paramref name="expression"/> to set checkbox element's "id"
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// checkbox element's "name" attribute. Sanitizes <paramref name="expression"/> to set checkbox element's "id"
         /// attribute.
         /// </para>
         /// <para>Determines checkbox element's "checked" attribute based on the following precedence:</para>
@@ -77,8 +80,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </item>
         /// <item><paramref name="isChecked"/> if non-<c>null</c>.</item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="bool"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="bool"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -94,10 +97,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent CheckBox(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             bool isChecked)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.CheckBox(expression, isChecked, htmlAttributes: null);
         }
 
@@ -115,8 +123,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; elements.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set checkbox
-        /// element's "name" attribute. Sanitizes <paramref name="expression"/> to set checkbox element's "id"
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// checkbox element's "name" attribute. Sanitizes <paramref name="expression"/> to set checkbox element's "id"
         /// attribute.
         /// </para>
         /// <para>Determines checkbox element's "checked" attribute based on the following precedence:</para>
@@ -126,8 +134,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// fully-qualified name) if entry exists and can be converted to a <see cref="bool"/>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="bool"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="bool"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -144,10 +152,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent CheckBox(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.CheckBox(expression, isChecked: null, htmlAttributes: htmlAttributes);
         }
 
@@ -160,7 +173,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; elements.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set checkbox element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set checkbox element's "id" attribute.
         /// </para>
@@ -182,9 +195,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent CheckBoxFor<TModel>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, bool>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, bool>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.CheckBoxFor(expression, htmlAttributes: null);
         }
 
@@ -196,7 +219,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -207,8 +230,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -219,8 +242,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <item>Otherwise, <c>string.Empty</c>.</item>
         /// </list>
         /// </remarks>
-        public static IHtmlContent Hidden([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent Hidden(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Hidden(expression, value: null, htmlAttributes: null);
         }
 
@@ -233,7 +261,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -245,8 +273,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </item>
         /// <item><paramref name="value"/> if non-<c>null</c>.</item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -258,10 +286,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent Hidden(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object value)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Hidden(expression, value, htmlAttributes: null);
         }
 
@@ -275,7 +308,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;input&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </para>
@@ -293,9 +326,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent HiddenFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.HiddenFor(expression, htmlAttributes: null);
         }
 
@@ -306,12 +349,17 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="expression">Expression name, relative to the current model.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute. Sets &lt;input&gt; element's "value" attribute to <c>string.Empty</c>.
         /// </remarks>
-        public static IHtmlContent Password([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent Password(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Password(expression, value: null, htmlAttributes: null);
         }
 
@@ -324,7 +372,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -335,10 +383,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent Password(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object value)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Password(expression, value, htmlAttributes: null);
         }
 
@@ -352,7 +405,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;input&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </para>
@@ -366,9 +419,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent PasswordFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.PasswordFor(expression, htmlAttributes: null);
         }
 
@@ -381,7 +444,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute. Sets &lt;input&gt; element's "value" attribute to <paramref name="value"/>.
         /// </para>
@@ -392,8 +455,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -411,10 +474,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent RadioButton(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object value)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.RadioButton(expression, value, isChecked: null, htmlAttributes: null);
         }
 
@@ -435,7 +503,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -453,8 +521,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </item>
         /// <item>Existing "checked" entry in <paramref name="htmlAttributes"/> if any.</item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -472,11 +540,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent RadioButton(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object value,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.RadioButton(expression, value, isChecked: null, htmlAttributes: htmlAttributes);
         }
 
@@ -496,7 +569,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -513,8 +586,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </item>
         /// <item><paramref name="isChecked"/> if non-<c>null</c>.</item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -532,11 +605,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent RadioButton(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object value,
             bool isChecked)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.RadioButton(expression, value, isChecked, htmlAttributes: null);
         }
 
@@ -551,7 +629,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;select&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute. Converts the
         /// <paramref name="value"/> to a <see cref="string"/> to set element's "value" attribute.
@@ -574,10 +652,25 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         public static IHtmlContent RadioButtonFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
-            [NotNull] object value)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
+            object value)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
+            if (value == null)
+            {
+                throw new ArgumentNullException(nameof(value));
+            }
+
             return htmlHelper.RadioButtonFor(expression, value, htmlAttributes: null);
         }
 
@@ -589,7 +682,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -600,8 +693,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -612,8 +705,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <item>Otherwise, <c>string.Empty</c>.</item>
         /// </list>
         /// </remarks>
-        public static IHtmlContent TextBox([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent TextBox(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.TextBox(expression, value: null, format: null, htmlAttributes: null);
         }
 
@@ -626,7 +724,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -640,8 +738,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="value"/> if non-<c>null</c>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -653,10 +751,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextBox(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object value)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.TextBox(expression, value, format: null, htmlAttributes: null);
         }
 
@@ -672,7 +775,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -688,8 +791,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="format"/> is <c>null</c> or empty.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>. Formats entry using
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>. Formats entry using
         /// <paramref name="format"/> or converts entry to a <see cref="string"/> directly if <paramref name="format"/>
         /// is <c>null</c> or empty.
         /// </item>
@@ -704,11 +807,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextBox(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object value,
             string format)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.TextBox(expression, value, format, htmlAttributes: null);
         }
 
@@ -726,7 +834,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;input&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -740,8 +848,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="value"/> if non-<c>null</c>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -754,11 +862,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextBox(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object value,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.TextBox(expression, value, format: null, htmlAttributes: htmlAttributes);
         }
 
@@ -772,7 +885,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;input&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </para>
@@ -789,9 +902,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextBoxFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.TextBoxFor(expression, format: null, htmlAttributes: null);
         }
 
@@ -808,7 +931,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;input&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </para>
@@ -827,10 +950,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextBoxFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string format)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.TextBoxFor(expression, format, htmlAttributes: null);
         }
 
@@ -849,7 +982,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;input&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;input&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </para>
@@ -867,10 +1000,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextBoxFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.TextBoxFor(expression, format: null, htmlAttributes: htmlAttributes);
         }
 
@@ -882,7 +1025,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;textarea&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;textarea&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -893,8 +1036,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -906,9 +1049,14 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextArea(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.TextArea(expression, value: null, rows: 0, columns: 0, htmlAttributes: null);
         }
 
@@ -925,7 +1073,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;textarea&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;textarea&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -936,8 +1084,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -949,10 +1097,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextArea(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.TextArea(expression, value: null, rows: 0, columns: 0, htmlAttributes: htmlAttributes);
         }
 
@@ -965,7 +1118,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;textarea&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;textarea&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -977,8 +1130,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </item>
         /// <item><paramref name="value"/> if non-<c>null</c>.</item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -990,10 +1143,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextArea(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string value)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.TextArea(expression, value, rows: 0, columns: 0, htmlAttributes: null);
         }
 
@@ -1011,7 +1169,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;textarea&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;textarea&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </para>
@@ -1023,8 +1181,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </item>
         /// <item><paramref name="value"/> if non-<c>null</c>.</item>
         /// <item>
-        /// <see cref="ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a fully-qualified
-        /// name) if entry exists and can be converted to a <see cref="string"/>.
+        /// <see cref="ViewFeatures.ViewDataDictionary"/> entry for <paramref name="expression"/> (converted to a 
+        /// fully-qualified name) if entry exists and can be converted to a <see cref="string"/>.
         /// </item>
         /// <item>
         /// Linq expression based on <paramref name="expression"/> (converted to a fully-qualified name) run against
@@ -1036,11 +1194,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextArea(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string value,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.TextArea(expression, value, rows: 0, columns: 0, htmlAttributes: htmlAttributes);
         }
 
@@ -1054,7 +1217,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;textarea&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;textarea&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </para>
@@ -1071,9 +1234,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextAreaFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.TextAreaFor(expression, rows: 0, columns: 0, htmlAttributes: null);
         }
 
@@ -1092,7 +1265,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;textarea&gt; element.</returns>
         /// <remarks>
         /// <para>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;textarea&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </para>
@@ -1109,10 +1282,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         public static IHtmlContent TextAreaFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.TextAreaFor(expression, rows: 0, columns: 0, htmlAttributes: htmlAttributes);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperLabelExtensions.cs

@@ -4,8 +4,6 @@
 using System;
 using System.Linq.Expressions;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -20,8 +18,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="htmlHelper">The <see cref="IHtmlHelper"/> instance this method extends.</param>
         /// <param name="expression">Expression name, relative to the current model.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
-        public static IHtmlContent Label([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent Label(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Label(expression, labelText: null, htmlAttributes: null);
         }
 
@@ -32,8 +35,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="expression">Expression name, relative to the current model.</param>
         /// <param name="labelText">The inner text of the element.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
-        public static IHtmlContent Label([NotNull] this IHtmlHelper htmlHelper, string expression, string labelText)
+        public static IHtmlContent Label(this IHtmlHelper htmlHelper, string expression, string labelText)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Label(expression, labelText, htmlAttributes: null);
         }
 
@@ -46,9 +54,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
         public static IHtmlContent LabelFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.LabelFor<TResult>(expression, labelText: null, htmlAttributes: null);
         }
 
@@ -62,10 +80,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
         public static IHtmlContent LabelFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string labelText)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.LabelFor<TResult>(expression, labelText, htmlAttributes: null);
         }
 
@@ -83,10 +111,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
         public static IHtmlContent LabelFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.LabelFor<TResult>(expression, labelText: null, htmlAttributes: htmlAttributes);
         }
 
@@ -95,8 +133,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </summary>
         /// <param name="htmlHelper">The <see cref="IHtmlHelper"/> instance this method extends.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
-        public static IHtmlContent LabelForModel([NotNull] this IHtmlHelper htmlHelper)
+        public static IHtmlContent LabelForModel(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Label(expression: null, labelText: null, htmlAttributes: null);
         }
 
@@ -106,8 +149,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="htmlHelper">The <see cref="IHtmlHelper"/> instance this method extends.</param>
         /// <param name="labelText">The inner text of the element.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
-        public static IHtmlContent LabelForModel([NotNull] this IHtmlHelper htmlHelper, string labelText)
+        public static IHtmlContent LabelForModel(this IHtmlHelper htmlHelper, string labelText)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Label(expression: null, labelText: labelText, htmlAttributes: null);
         }
 
@@ -121,8 +169,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// attributes.
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
-        public static IHtmlContent LabelForModel([NotNull] this IHtmlHelper htmlHelper, object htmlAttributes)
+        public static IHtmlContent LabelForModel(this IHtmlHelper htmlHelper, object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Label(expression: null, labelText: null, htmlAttributes: htmlAttributes);
         }
 
@@ -138,10 +191,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
         public static IHtmlContent LabelForModel(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string labelText,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Label(expression: null, labelText: labelText, htmlAttributes: htmlAttributes);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperLinkExtensions.cs

@@ -1,9 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -20,10 +19,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="actionName">The name of the action.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent ActionLink(
-            [NotNull] this IHtmlHelper helper,
-            [NotNull] string linkText,
+            this IHtmlHelper helper,
+            string linkText,
             string actionName)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return helper.ActionLink(
                 linkText,
                 actionName,
@@ -50,11 +59,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent ActionLink(
-            [NotNull] this IHtmlHelper helper,
-            [NotNull] string linkText,
+            this IHtmlHelper helper,
+            string linkText,
             string actionName,
             object routeValues)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return helper.ActionLink(
                 linkText,
                 actionName,
@@ -86,12 +105,22 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent ActionLink(
-            [NotNull] this IHtmlHelper helper,
-            [NotNull] string linkText,
+            this IHtmlHelper helper,
+            string linkText,
             string actionName,
             object routeValues,
             object htmlAttributes)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return helper.ActionLink(
                 linkText,
                 actionName,
@@ -112,11 +141,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="controllerName">The name of the controller.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent ActionLink(
-            [NotNull] this IHtmlHelper helper,
-            [NotNull] string linkText,
+            this IHtmlHelper helper,
+            string linkText,
             string actionName,
             string controllerName)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return helper.ActionLink(
                 linkText,
                 actionName,
@@ -144,12 +183,22 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent ActionLink(
-            [NotNull] this IHtmlHelper helper,
-            [NotNull] string linkText,
+            this IHtmlHelper helper,
+            string linkText,
             string actionName,
             string controllerName,
             object routeValues)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return helper.ActionLink(
                 linkText,
                 actionName,
@@ -182,13 +231,23 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent ActionLink(
-            [NotNull] this IHtmlHelper helper,
-            [NotNull] string linkText,
+            this IHtmlHelper helper,
+            string linkText,
             string actionName,
             string controllerName,
             object routeValues,
             object htmlAttributes)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return helper.ActionLink(
                 linkText,
                 actionName,
@@ -214,10 +273,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent RouteLink(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string linkText,
+            this IHtmlHelper htmlHelper,
+            string linkText,
             object routeValues)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return htmlHelper.RouteLink(
                                 linkText,
                                 routeName: null,
@@ -236,10 +305,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="routeName">The name of the route.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent RouteLink(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string linkText,
+            this IHtmlHelper htmlHelper,
+            string linkText,
             string routeName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return htmlHelper.RouteLink(
                                 linkText,
                                 routeName,
@@ -265,11 +344,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent RouteLink(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string linkText,
+            this IHtmlHelper htmlHelper,
+            string linkText,
             string routeName,
             object routeValues)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return htmlHelper.RouteLink(
                                 linkText,
                                 routeName,
@@ -299,11 +388,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent RouteLink(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string linkText,
+            this IHtmlHelper htmlHelper,
+            string linkText,
             object routeValues,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return htmlHelper.RouteLink(
                                 linkText,
                                 routeName: null,
@@ -334,12 +433,22 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         public static IHtmlContent RouteLink(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string linkText,
+            this IHtmlHelper htmlHelper,
+            string linkText,
             string routeName,
             object routeValues,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             return htmlHelper.RouteLink(
                                  linkText,
                                  routeName,

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperNameExtensions.cs

@@ -1,8 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
+using System;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -16,8 +15,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </summary>
         /// <param name="htmlHelper">The <see cref="IHtmlHelper"/> instance this method extends.</param>
         /// <returns>A <see cref="string"/> containing the element name.</returns>
-        public static string NameForModel([NotNull] this IHtmlHelper htmlHelper)
+        public static string NameForModel(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Name(expression: null);
         }
 
@@ -26,8 +30,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </summary>
         /// <param name="htmlHelper">The <see cref="IHtmlHelper"/> instance this method extends.</param>
         /// <returns>A <see cref="string"/> containing the element Id.</returns>
-        public static string IdForModel([NotNull] this IHtmlHelper htmlHelper)
+        public static string IdForModel(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Id(expression: null);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperPartialExtensions.cs

@@ -1,10 +1,10 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Html.Abstractions;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -25,9 +25,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// the created HTML.
         /// </returns>
         public static Task<IHtmlContent> PartialAsync(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName)
+            this IHtmlHelper htmlHelper,
+            string partialViewName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return htmlHelper.PartialAsync(partialViewName, htmlHelper.ViewData.Model, viewData: null);
         }
 
@@ -44,10 +54,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// the created HTML.
         /// </returns>
         public static Task<IHtmlContent> PartialAsync(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName,
+            this IHtmlHelper htmlHelper,
+            string partialViewName,
             ViewDataDictionary viewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return htmlHelper.PartialAsync(partialViewName, htmlHelper.ViewData.Model, viewData: viewData);
         }
 
@@ -64,10 +84,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// the created HTML.
         /// </returns>
         public static Task<IHtmlContent> PartialAsync(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName,
+            this IHtmlHelper htmlHelper,
+            string partialViewName,
             object model)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return htmlHelper.PartialAsync(partialViewName, model, viewData: null);
         }
 
@@ -86,9 +116,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <see cref="IHtmlHelper.PartialAsync(string, object, ViewDataDictionary)"/>
         /// </remarks>
         public static IHtmlContent Partial(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName)
+            this IHtmlHelper htmlHelper,
+            string partialViewName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return Partial(htmlHelper, partialViewName, htmlHelper.ViewData.Model, viewData: null);
         }
 
@@ -108,10 +148,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <see cref="IHtmlHelper.PartialAsync(string, object, ViewDataDictionary)"/>
         /// </remarks>
         public static IHtmlContent Partial(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName,
+            this IHtmlHelper htmlHelper,
+            string partialViewName,
             ViewDataDictionary viewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return Partial(htmlHelper, partialViewName, htmlHelper.ViewData.Model, viewData);
         }
 
@@ -131,10 +181,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <see cref="IHtmlHelper.PartialAsync(string, object, ViewDataDictionary)"/>
         /// </remarks>
         public static IHtmlContent Partial(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName,
+            this IHtmlHelper htmlHelper,
+            string partialViewName,
             object model)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return Partial(htmlHelper, partialViewName, model, viewData: null);
         }
 
@@ -155,11 +215,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <see cref="IHtmlHelper.PartialAsync(string, object, ViewDataDictionary)"/>
         /// </remarks>
         public static IHtmlContent Partial(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName,
+            this IHtmlHelper htmlHelper,
+            string partialViewName,
             object model,
             ViewDataDictionary viewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             var result = htmlHelper.PartialAsync(partialViewName, model, viewData);
             return result.GetAwaiter().GetResult();
         }
@@ -176,9 +246,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static Task RenderPartialAsync(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName)
+            this IHtmlHelper htmlHelper,
+            string partialViewName)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return htmlHelper.RenderPartialAsync(partialViewName, htmlHelper.ViewData.Model,
                                                  viewData: htmlHelper.ViewData);
         }
@@ -196,10 +276,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static Task RenderPartialAsync(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName,
+            this IHtmlHelper htmlHelper,
+            string partialViewName,
             ViewDataDictionary viewData)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return htmlHelper.RenderPartialAsync(partialViewName, htmlHelper.ViewData.Model, viewData: viewData);
         }
 
@@ -216,10 +306,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
         public static Task RenderPartialAsync(
-            [NotNull] this IHtmlHelper htmlHelper,
-            [NotNull] string partialViewName,
+            this IHtmlHelper htmlHelper,
+            string partialViewName,
             object model)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return htmlHelper.RenderPartialAsync(partialViewName, model, htmlHelper.ViewData);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperSelectExtensions.cs

@@ -5,8 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -22,12 +20,17 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="expression">Expression name, relative to the current model.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;select&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </remarks>
-        public static IHtmlContent DropDownList([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent DropDownList(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.DropDownList(expression, selectList: null, optionLabel: null, htmlAttributes: null);
         }
 
@@ -42,15 +45,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;select&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </remarks>
         public static IHtmlContent DropDownList(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string optionLabel)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.DropDownList(
                 expression,
                 selectList: null,
@@ -70,15 +78,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;select&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </remarks>
         public static IHtmlContent DropDownList(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             IEnumerable<SelectListItem> selectList)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.DropDownList(expression, selectList, optionLabel: null, htmlAttributes: null);
         }
 
@@ -98,16 +111,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;select&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </remarks>
         public static IHtmlContent DropDownList(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             IEnumerable<SelectListItem> selectList,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.DropDownList(expression, selectList, optionLabel: null, htmlAttributes: htmlAttributes);
         }
 
@@ -126,16 +144,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;select&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </remarks>
         public static IHtmlContent DropDownList(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             IEnumerable<SelectListItem> selectList,
             string optionLabel)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.DropDownList(expression, selectList, optionLabel, htmlAttributes: null);
         }
 
@@ -153,15 +176,25 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;select&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </remarks>
         public static IHtmlContent DropDownListFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             IEnumerable<SelectListItem> selectList)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DropDownListFor(expression, selectList, optionLabel: null, htmlAttributes: null);
         }
 
@@ -183,16 +216,26 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;select&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </remarks>
         public static IHtmlContent DropDownListFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             IEnumerable<SelectListItem> selectList,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DropDownListFor(
                 expression,
                 selectList,
@@ -217,16 +260,26 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;select&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </remarks>
         public static IHtmlContent DropDownListFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             IEnumerable<SelectListItem> selectList,
             string optionLabel)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.DropDownListFor(expression, selectList, optionLabel, htmlAttributes: null);
         }
 
@@ -237,12 +290,17 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="expression">Expression name, relative to the current model.</param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;select&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </remarks>
-        public static IHtmlContent ListBox([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static IHtmlContent ListBox(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ListBox(expression, selectList: null, htmlAttributes: null);
         }
 
@@ -258,15 +316,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and <paramref name="expression"/> to set
         /// &lt;select&gt; element's "name" attribute. Sanitizes <paramref name="expression"/> to set element's "id"
         /// attribute.
         /// </remarks>
         public static IHtmlContent ListBox(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             IEnumerable<SelectListItem> selectList)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ListBox(expression, selectList, htmlAttributes: null);
         }
 
@@ -284,15 +347,25 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;select&gt; element.</returns>
         /// <remarks>
-        /// Combines <see cref="TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
+        /// Combines <see cref="ViewFeatures.TemplateInfo.HtmlFieldPrefix"/> and the string representation of the
         /// <paramref name="expression"/> to set &lt;select&gt; element's "name" attribute. Sanitizes the string
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </remarks>
         public static IHtmlContent ListBoxFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             IEnumerable<SelectListItem> selectList)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.ListBoxFor(expression, selectList, htmlAttributes: null);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperValidationExtensions.cs

@@ -4,8 +4,6 @@
 using System;
 using System.Linq.Expressions;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -29,9 +27,14 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// will always be visible but client-side validation may update the associated CSS class.
         /// </remarks>
         public static IHtmlContent ValidationMessage(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationMessage(expression, message: null, htmlAttributes: null, tag: null);
         }
 
@@ -51,10 +54,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <c>null</c> if the <paramref name="expression"/> is valid and client-side validation is disabled.
         /// </returns>
         public static IHtmlContent ValidationMessage(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string message)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationMessage(expression, message, htmlAttributes: null, tag: null);
         }
 
@@ -79,10 +87,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// will always be visible but client-side validation may update the associated CSS class.
         /// </remarks>
         public static IHtmlContent ValidationMessage(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationMessage(expression, message: null, htmlAttributes: htmlAttributes, tag: null);
         }
 
@@ -106,11 +119,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="expression"/> is valid and client-side validation is disabled.
         /// </returns>
         public static IHtmlContent ValidationMessage(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string message,
             string tag)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationMessage(expression, message, htmlAttributes: null, tag: tag);
         }
 
@@ -136,11 +154,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <c>null</c> if the <paramref name="expression"/> is valid and client-side validation is disabled.
         /// </returns>
         public static IHtmlContent ValidationMessage(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string expression,
             string message,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationMessage(expression, message, htmlAttributes, tag: null);
         }
 
@@ -161,9 +184,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// will always be visible but client-side validation may update the associated CSS class.
         /// </remarks>
         public static IHtmlContent ValidationMessageFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.ValidationMessageFor(expression, message: null, htmlAttributes: null, tag: null);
         }
 
@@ -185,10 +218,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <c>null</c> if the <paramref name="expression"/> is valid and client-side validation is disabled.
         /// </returns>
         public static IHtmlContent ValidationMessageFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string message)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.ValidationMessageFor(expression, message, htmlAttributes: null, tag: null);
         }
 
@@ -216,11 +259,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <c>null</c> if the <paramref name="expression"/> is valid and client-side validation is disabled.
         /// </returns>
         public static IHtmlContent ValidationMessageFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string message,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.ValidationMessageFor(expression, message, htmlAttributes, tag: null);
         }
 
@@ -246,11 +299,21 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="expression"/> is valid and client-side validation is disabled.
         /// </returns>
         public static IHtmlContent ValidationMessageFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression,
             string message,
             string tag)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.ValidationMessageFor(expression, message, htmlAttributes: null, tag: tag);
         }
 
@@ -263,8 +326,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// New <see cref="IHtmlContent"/> containing a &lt;div&gt; element wrapping the &lt;ul&gt; element.
         /// <see cref="HtmlString.Empty"/> if the current model is valid and client-side validation is disabled).
         /// </returns>
-        public static IHtmlContent ValidationSummary([NotNull] this IHtmlHelper htmlHelper)
+        public static IHtmlContent ValidationSummary(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(
                 excludePropertyErrors: false,
                 message: null,
@@ -284,8 +352,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// New <see cref="IHtmlContent"/> containing a &lt;div&gt; element wrapping the &lt;ul&gt; element.
         /// <see cref="HtmlString.Empty"/> if the current model is valid and client-side validation is disabled).
         /// </returns>
-        public static IHtmlContent ValidationSummary([NotNull] this IHtmlHelper htmlHelper, bool excludePropertyErrors)
+        public static IHtmlContent ValidationSummary(this IHtmlHelper htmlHelper, bool excludePropertyErrors)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(
                 excludePropertyErrors,
                 message: null,
@@ -305,8 +378,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="message"/>) and the &lt;ul&gt; element. <see cref="HtmlString.Empty"/> if the current model
         /// is valid and client-side validation is disabled).
         /// </returns>
-        public static IHtmlContent ValidationSummary([NotNull] this IHtmlHelper htmlHelper, string message)
+        public static IHtmlContent ValidationSummary(this IHtmlHelper htmlHelper, string message)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(
                 excludePropertyErrors: false,
                 message: message,
@@ -329,8 +407,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// and the &lt;ul&gt; element. <see cref="HtmlString.Empty"/> if the current model is valid and client-side
         /// validation is disabled).
         /// </returns>
-        public static IHtmlContent ValidationSummary([NotNull] this IHtmlHelper htmlHelper, string message, string tag)
+        public static IHtmlContent ValidationSummary(this IHtmlHelper htmlHelper, string message, string tag)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(
                 excludePropertyErrors: false,
                 message: message,
@@ -354,10 +437,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// is valid and client-side validation is disabled).
         /// </returns>
         public static IHtmlContent ValidationSummary(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             bool excludePropertyErrors,
             string message)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(
                 excludePropertyErrors,
                 message,
@@ -383,10 +471,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// is valid and client-side validation is disabled).
         /// </returns>
         public static IHtmlContent ValidationSummary(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string message,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(
                 excludePropertyErrors: false,
                 message: message,
@@ -415,11 +508,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// validation is disabled).
         /// </returns>
         public static IHtmlContent ValidationSummary(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             string message,
             object htmlAttributes,
             string tag)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(
                 excludePropertyErrors: false,
                 message: message,
@@ -446,11 +544,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// validation is disabled).
         /// </returns>
         public static IHtmlContent ValidationSummary(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             bool excludePropertyErrors,
             string message,
             string tag)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(
                 excludePropertyErrors,
                 message,
@@ -479,11 +582,16 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// is valid and client-side validation is disabled).
         /// </returns>
         public static IHtmlContent ValidationSummary(
-            [NotNull] this IHtmlHelper htmlHelper,
+            this IHtmlHelper htmlHelper,
             bool excludePropertyErrors,
             string message,
             object htmlAttributes)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.ValidationSummary(excludePropertyErrors, message, htmlAttributes, tag: null);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlHelperValueExtensions.cs

@@ -3,8 +3,6 @@
 
 using System;
 using System.Linq.Expressions;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -22,8 +20,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <remarks>
         /// Converts the expression result to a <see cref="string"/> directly.
         /// </remarks>
-        public static string Value([NotNull] this IHtmlHelper htmlHelper, string expression)
+        public static string Value(this IHtmlHelper htmlHelper, string expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Value(expression, format: null);
         }
 
@@ -39,9 +42,19 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// Converts the <paramref name="expression"/> result to a <see cref="string"/> directly.
         /// </remarks>
         public static string ValueFor<TModel, TResult>(
-            [NotNull] this IHtmlHelper<TModel> htmlHelper,
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            this IHtmlHelper<TModel> htmlHelper,
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return htmlHelper.ValueFor(expression, format: null);
         }
 
@@ -53,8 +66,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <remarks>
         /// Converts the model value to a <see cref="string"/> directly.
         /// </remarks>
-        public static string ValueForModel([NotNull] this IHtmlHelper htmlHelper)
+        public static string ValueForModel(this IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Value(expression: null, format: null);
         }
 
@@ -70,8 +88,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// Converts the model value to a <see cref="string"/> directly if
         /// <paramref name="format"/> is <c>null</c> or empty.
         /// </remarks>
-        public static string ValueForModel([NotNull] this IHtmlHelper htmlHelper, string format)
+        public static string ValueForModel(this IHtmlHelper htmlHelper, string format)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return htmlHelper.Value(expression: null, format: format);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/HtmlString.cs

@@ -4,7 +4,6 @@
 using System;
 using System.IO;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.Rendering
@@ -36,8 +35,18 @@ namespace Microsoft.AspNet.Mvc.Rendering
         }
 
         /// <inheritdoc />
-        public void WriteTo([NotNull] TextWriter writer, [NotNull] IHtmlEncoder encoder)
+        public void WriteTo(TextWriter writer, IHtmlEncoder encoder)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (encoder == null)
+            {
+                throw new ArgumentNullException(nameof(encoder));
+            }
+
             writer.Write(_input);
         }
 

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/IHtmlHelper.cs

@@ -8,7 +8,6 @@ using Microsoft.AspNet.Html.Abstractions;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.ModelBinding.Validation;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.Rendering
@@ -86,7 +85,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         IHtmlContent ActionLink(
-            [NotNull] string linkText,
+            string linkText,
             string actionName,
             string controllerName,
             string protocol,
@@ -360,7 +359,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// Fully-qualified expression name, ignoring the current model. Must not be <c>null</c>.
         /// </param>
         /// <returns>A <see cref="string"/> containing the element Id.</returns>
-        string GenerateIdFromName([NotNull] string fullName);
+        string GenerateIdFromName(string fullName);
 
         /// <summary>
         /// Returns information about about client validation rules for the specified <paramref name="metadata"/> or
@@ -402,7 +401,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// Thrown if <paramref name="enumType"/> is not an <see cref="Enum"/> or if it has a
         /// <see cref="FlagsAttribute"/>.
         /// </exception>
-        IEnumerable<SelectListItem> GetEnumSelectList([NotNull] Type enumType);
+        IEnumerable<SelectListItem> GetEnumSelectList(Type enumType);
 
         /// <summary>
         /// Returns an &lt;input&gt; element of type "hidden" for the specified <paramref name="expression"/>.
@@ -502,7 +501,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// A <see cref="Task"/> that on completion returns a new <see cref="HtmlString"/> containing
         /// the created HTML.
         /// </returns>
-        Task<IHtmlContent> PartialAsync([NotNull] string partialViewName, object model, ViewDataDictionary viewData);
+        Task<IHtmlContent> PartialAsync(string partialViewName, object model, ViewDataDictionary viewData);
 
         /// <summary>
         /// Returns an &lt;input&gt; element of type "password" for the specified <paramref name="expression"/>.
@@ -617,7 +616,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <remarks>
         /// In this context, "renders" means the method writes its output using <see cref="ViewContext.Writer"/>.
         /// </remarks>
-        Task RenderPartialAsync([NotNull] string partialViewName, object model, ViewDataDictionary viewData);
+        Task RenderPartialAsync(string partialViewName, object model, ViewDataDictionary viewData);
 
         /// <summary>
         /// Returns an anchor (&lt;a&gt;) element that contains a URL path to the specified route.
@@ -639,7 +638,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </param>
         /// <returns>A new <see cref="IHtmlContent"/> containing the anchor element.</returns>
         IHtmlContent RouteLink(
-            [NotNull] string linkText,
+            string linkText,
             string routeName,
             string protocol,
             string hostName,

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/IHtmlHelperOfT.cs

@@ -6,7 +6,6 @@ using System.Collections.Generic;
 using System.Linq.Expressions;
 using Microsoft.AspNet.Html.Abstractions;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -55,7 +54,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// if the <see cref="bool"/> values is <c>true</c>; does not include the attribute otherwise.
         /// </para>
         /// </remarks>
-        IHtmlContent CheckBoxFor([NotNull] Expression<Func<TModel, bool>> expression, object htmlAttributes);
+        IHtmlContent CheckBoxFor(Expression<Func<TModel, bool>> expression, object htmlAttributes);
 
         /// <summary>
         /// Returns HTML markup for the <paramref name="expression"/>, using a display template, specified HTML field
@@ -80,7 +79,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="expression"/> result.
         /// </remarks>
         IHtmlContent DisplayFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string templateName,
             string htmlFieldName,
             object additionalViewData);
@@ -91,7 +90,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="expression">An expression to be evaluated against the current model.</param>
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A <see cref="string"/> containing the display name.</returns>
-        string DisplayNameFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression);
+        string DisplayNameFor<TResult>(Expression<Func<TModel, TResult>> expression);
 
         /// <summary>
         /// Returns the display name for the specified <paramref name="expression"/>
@@ -102,7 +101,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A <see cref="string"/> containing the display name.</returns>
         string DisplayNameForInnerType<TModelItem, TResult>(
-            [NotNull] Expression<Func<TModelItem, TResult>> expression);
+            Expression<Func<TModelItem, TResult>> expression);
 
         /// <summary>
         /// Returns the simple display text for the specified <paramref name="expression"/>.
@@ -114,7 +113,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// If the <paramref name="expression"/> result is <c>null</c>, returns
         /// <see cref="ModelBinding.ModelMetadata.NullDisplayText"/>.
         /// </returns>
-        string DisplayTextFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression);
+        string DisplayTextFor<TResult>(Expression<Func<TModel, TResult>> expression);
 
         /// <summary>
         /// Returns a single-selection HTML &lt;select&gt; element for the <paramref name="expression"/>, using the
@@ -140,7 +139,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </remarks>
         IHtmlContent DropDownListFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             IEnumerable<SelectListItem> selectList,
             string optionLabel,
             object htmlAttributes);
@@ -168,7 +167,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// elements for each property in the <paramref name="expression"/> result.
         /// </remarks>
         IHtmlContent EditorFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string templateName,
             string htmlFieldName,
             object additionalViewData);
@@ -210,7 +209,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         IHtmlContent HiddenFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             object htmlAttributes);
 
         /// <summary>
@@ -219,7 +218,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="expression">An expression to be evaluated against the current model.</param>
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A <see cref="string"/> containing the element Id.</returns>
-        string IdFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression);
+        string IdFor<TResult>(Expression<Func<TModel, TResult>> expression);
 
         /// <summary>
         /// Returns a &lt;label&gt; element for the specified <paramref name="expression"/>.
@@ -233,7 +232,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A new <see cref="IHtmlContent"/> containing the &lt;label&gt; element.</returns>
         IHtmlContent LabelFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string labelText,
             object htmlAttributes);
 
@@ -258,7 +257,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// representation of the <paramref name="expression"/> to set element's "id" attribute.
         /// </remarks>
         IHtmlContent ListBoxFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             IEnumerable<SelectListItem> selectList,
             object htmlAttributes);
 
@@ -268,7 +267,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="expression">An expression to be evaluated against the current model.</param>
         /// <typeparam name="TResult">The type of the <paramref name="expression"/> result.</typeparam>
         /// <returns>A <see cref="string"/> containing the element name.</returns>
-        string NameFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression);
+        string NameFor<TResult>(Expression<Func<TModel, TResult>> expression);
 
         /// <summary>
         /// Returns an &lt;input&gt; element of type "password" for the specified <paramref name="expression"/>.
@@ -297,7 +296,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         IHtmlContent PasswordFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             object htmlAttributes);
 
         /// <summary>
@@ -337,8 +336,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </para>
         /// </remarks>
         IHtmlContent RadioButtonFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
-            [NotNull] object value,
+            Expression<Func<TModel, TResult>> expression,
+            object value,
             object htmlAttributes);
 
         /// <inheritdoc cref="IHtmlHelper.Raw(object)"/>
@@ -378,7 +377,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         IHtmlContent TextAreaFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             int rows,
             int columns,
             object htmlAttributes);
@@ -418,7 +417,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// </list>
         /// </remarks>
         IHtmlContent TextBoxFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string format,
             object htmlAttributes);
 
@@ -446,7 +445,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="expression"/> is valid and client-side validation is disabled.
         /// </returns>
         IHtmlContent ValidationMessageFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string message,
             object htmlAttributes,
             string tag);
@@ -465,7 +464,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <paramref name="format"/> is <c>null</c> or empty.
         /// </remarks>
         string ValueFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string format);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/IJsonHelper.cs

@@ -1,7 +1,6 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Microsoft.Framework.Internal;
 using Newtonsoft.Json;
 
 namespace Microsoft.AspNet.Mvc.Rendering
@@ -24,6 +23,6 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="value">The value to serialize as JSON.</param>
         /// <param name="serializerSettings">The <see cref="JsonSerializerSettings"/> to be used by the serializer.</param>
         /// <returns>A new <see cref="HtmlString"/> containing the serialized JSON.</returns>
-        HtmlString Serialize(object value, [NotNull] JsonSerializerSettings serializerSettings);
+        HtmlString Serialize(object value, JsonSerializerSettings serializerSettings);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/MultiSelectList.cs

@@ -7,7 +7,6 @@ using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -15,28 +14,44 @@ namespace Microsoft.AspNet.Mvc.Rendering
     {
         private IList<SelectListGroup> _groups;
 
-        public MultiSelectList([NotNull] IEnumerable items)
+        public MultiSelectList(IEnumerable items)
             : this(items, selectedValues: null)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
         }
 
-        public MultiSelectList([NotNull] IEnumerable items, IEnumerable selectedValues)
+        public MultiSelectList(IEnumerable items, IEnumerable selectedValues)
             : this(items, dataValueField: null, dataTextField: null, selectedValues: selectedValues)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
         }
 
-        public MultiSelectList([NotNull] IEnumerable items, string dataValueField, string dataTextField)
+        public MultiSelectList(IEnumerable items, string dataValueField, string dataTextField)
             : this(items, dataValueField, dataTextField, selectedValues: null)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
         }
 
         public MultiSelectList(
-            [NotNull] IEnumerable items,
+            IEnumerable items,
             string dataValueField,
             string dataTextField,
             IEnumerable selectedValues)
             : this(items, dataValueField, dataTextField, selectedValues, dataGroupField: null)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
         }
 
         /// <summary>
@@ -53,12 +68,17 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="dataGroupField">The data group field. Used to match the Group property of the corresponding
         /// <see cref="SelectListItem"/>.</param>
         public MultiSelectList(
-            [NotNull] IEnumerable items,
+            IEnumerable items,
             string dataValueField,
             string dataTextField,
             IEnumerable selectedValues,
             string dataGroupField)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
+
             Items = items;
             DataValueField = dataValueField;
             DataTextField = dataTextField;

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/MvcForm.cs

@@ -3,7 +3,6 @@
 
 using System;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -12,8 +11,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         private readonly ViewContext _viewContext;
         private bool _disposed;
 
-        public MvcForm([NotNull] ViewContext viewContext)
+        public MvcForm(ViewContext viewContext)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             _viewContext = viewContext;
 
             // Push the new FormContext; GenerateEndForm() does the corresponding pop.

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/SelectList.cs

@@ -1,35 +1,52 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Collections;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
     public class SelectList : MultiSelectList
     {
-        public SelectList([NotNull] IEnumerable items)
+        public SelectList(IEnumerable items)
             : this(items, selectedValue: null)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
         }
 
-        public SelectList([NotNull] IEnumerable items, object selectedValue)
+        public SelectList(IEnumerable items, object selectedValue)
             : this(items, dataValueField: null, dataTextField: null, selectedValue: selectedValue)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
         }
 
-        public SelectList([NotNull] IEnumerable items, string dataValueField, string dataTextField)
+        public SelectList(IEnumerable items, string dataValueField, string dataTextField)
             : this(items, dataValueField, dataTextField, selectedValue: null)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
         }
 
         public SelectList(
-            [NotNull] IEnumerable items,
+            IEnumerable items,
             string dataValueField,
             string dataTextField,
             object selectedValue)
             : base(items, dataValueField, dataTextField, ToEnumerable(selectedValue))
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
+
             SelectedValue = selectedValue;
         }
 
@@ -47,13 +64,18 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="dataGroupField">The data group field. Used to match the Group property of the corresponding
         /// <see cref="SelectListItem"/>.</param>
         public SelectList(
-            [NotNull] IEnumerable items,
+            IEnumerable items,
             string dataValueField,
             string dataTextField,
             object selectedValue,
             string dataGroupField)
             : base(items, dataValueField, dataTextField, ToEnumerable(selectedValue), dataGroupField)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
+
             SelectedValue = selectedValue;
         }
 

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/TagBuilder.cs

@@ -71,8 +71,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// Valid HTML 4.01 "id" attribute for an element with the given <paramref name="name"/>.
         /// </returns>
         /// <remarks>Valid "id" attributes are defined in http://www.w3.org/TR/html401/types.html#type-id</remarks>
-        public static string CreateSanitizedId(string name, [NotNull] string invalidCharReplacement)
+        public static string CreateSanitizedId(string name, string invalidCharReplacement)
         {
+            if (invalidCharReplacement == null)
+            {
+                throw new ArgumentNullException(nameof(invalidCharReplacement));
+            }
+
             if (string.IsNullOrEmpty(name))
             {
                 return string.Empty;
@@ -127,8 +132,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
             return stringBuffer.ToString();
         }
 
-        public void GenerateId(string name, [NotNull] string idAttributeDotReplacement)
+        public void GenerateId(string name, string idAttributeDotReplacement)
         {
+            if (idAttributeDotReplacement == null)
+            {
+                throw new ArgumentNullException(nameof(idAttributeDotReplacement));
+            }
+
             if (!Attributes.ContainsKey("id"))
             {
                 var sanitizedId = CreateSanitizedId(name, idAttributeDotReplacement);

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/ViewComponentHelperExtensions.cs

@@ -1,36 +1,54 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Threading.Tasks;
-using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.AspNet.Mvc.ViewComponents;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
     public static class ViewComponentHelperExtensions
     {
-        public static HtmlString Invoke<TComponent>([NotNull] this IViewComponentHelper helper,
+        public static HtmlString Invoke<TComponent>(this IViewComponentHelper helper,
             params object[] args)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
             return helper.Invoke(typeof(TComponent), args);
         }
 
-        public static void RenderInvoke<TComponent>([NotNull] this IViewComponentHelper helper,
+        public static void RenderInvoke<TComponent>(this IViewComponentHelper helper,
             params object[] args)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
             helper.RenderInvoke(typeof(TComponent), args);
         }
 
-        public static Task<HtmlString> InvokeAsync<TComponent>([NotNull] this IViewComponentHelper helper,
+        public static Task<HtmlString> InvokeAsync<TComponent>(this IViewComponentHelper helper,
             params object[] args)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
             return helper.InvokeAsync(typeof(TComponent), args);
         }
 
-        public static Task RenderInvokeAsync<TComponent>([NotNull] this IViewComponentHelper helper,
+        public static Task RenderInvokeAsync<TComponent>(this IViewComponentHelper helper,
             params object[] args)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
             return helper.RenderInvokeAsync(typeof(TComponent), args);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/Rendering/ViewContext.cs

@@ -1,11 +1,11 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.IO;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -40,14 +40,44 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="tempData">The <see cref="ITempDataDictionary"/>.</param>
         /// <param name="writer">The <see cref="TextWriter"/> to render output to.</param>
         public ViewContext(
-            [NotNull] ActionContext actionContext,
-            [NotNull] IView view,
-            [NotNull] ViewDataDictionary viewData,
-            [NotNull] ITempDataDictionary tempData,
-            [NotNull] TextWriter writer,
-            [NotNull] HtmlHelperOptions htmlHelperOptions)
+            ActionContext actionContext,
+            IView view,
+            ViewDataDictionary viewData,
+            ITempDataDictionary tempData,
+            TextWriter writer,
+            HtmlHelperOptions htmlHelperOptions)
             : base(actionContext)
         {
+            if (actionContext == null)
+            {
+                throw new ArgumentNullException(nameof(actionContext));
+            }
+
+            if (view == null)
+            {
+                throw new ArgumentNullException(nameof(view));
+            }
+
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
+            if (tempData == null)
+            {
+                throw new ArgumentNullException(nameof(tempData));
+            }
+
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (htmlHelperOptions == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelperOptions));
+            }
+
             View = view;
             ViewData = viewData;
             TempData = tempData;
@@ -68,12 +98,32 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="viewData">The <see cref="ViewDataDictionary"/>.</param>
         /// <param name="writer">The <see cref="TextWriter"/> to render output to.</param>
         public ViewContext(
-            [NotNull] ViewContext viewContext,
-            [NotNull] IView view,
-            [NotNull] ViewDataDictionary viewData,
-            [NotNull] TextWriter writer)
+            ViewContext viewContext,
+            IView view,
+            ViewDataDictionary viewData,
+            TextWriter writer)
             : base(viewContext)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
+            if (view == null)
+            {
+                throw new ArgumentNullException(nameof(view));
+            }
+
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
             _formContext = viewContext.FormContext;
             ClientValidationEnabled = viewContext.ClientValidationEnabled;
             Html5DateRenderingMode = viewContext.Html5DateRenderingMode;

src/Microsoft.AspNet.Mvc.ViewFeatures/SkipStatusCodePagesAttribute.cs

@@ -5,7 +5,6 @@ using System;
 using Microsoft.AspNet.Diagnostics;
 using Microsoft.AspNet.Http.Features;
 using Microsoft.AspNet.Mvc.Filters;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc
 {
@@ -16,13 +15,22 @@ namespace Microsoft.AspNet.Mvc
     public class SkipStatusCodePagesAttribute : Attribute, IResourceFilter
     {
         /// <inheritdoc />
-        public void OnResourceExecuted([NotNull] ResourceExecutedContext context)
+        public void OnResourceExecuted(ResourceExecutedContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
         }
 
         /// <inheritdoc />
-        public void OnResourceExecuting([NotNull] ResourceExecutingContext context)
+        public void OnResourceExecuting(ResourceExecutingContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var statusCodeFeature = context.HttpContext.Features.Get<IStatusCodePagesFeature>();
             if (statusCodeFeature != null)
             {

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponent.cs

@@ -1,17 +1,16 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Security.Principal;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.AspNet.Mvc.Routing;
 using Microsoft.AspNet.Mvc.ViewComponents;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Routing;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 using Newtonsoft.Json;
 
 namespace Microsoft.AspNet.Mvc
@@ -114,10 +113,13 @@ namespace Microsoft.AspNet.Mvc
 
                 return _url;
             }
-
-            [param: NotNull]
             set
             {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
                 _url = value;
             }
         }
@@ -135,10 +137,13 @@ namespace Microsoft.AspNet.Mvc
 
                 return _viewComponentContext;
             }
-
-            [param: NotNull]
             set
             {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
                 _viewComponentContext = value;
             }
         }
@@ -181,10 +186,13 @@ namespace Microsoft.AspNet.Mvc
 
                 return _viewEngine;
             }
-
-            [param: NotNull]
             set
             {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
                 _viewEngine = value;
             }
         }
@@ -194,8 +202,13 @@ namespace Microsoft.AspNet.Mvc
         /// </summary>
         /// <param name="content">The content, will be HTML encoded before output.</param>
         /// <returns>A <see cref="ContentViewComponentResult"/>.</returns>
-        public ContentViewComponentResult Content([NotNull] string content)
+        public ContentViewComponentResult Content(string content)
         {
+            if (content == null)
+            {
+                throw new ArgumentNullException(nameof(content));
+            }
+
             return new ContentViewComponentResult(content);
         }
 
@@ -218,8 +231,13 @@ namespace Microsoft.AspNet.Mvc
         /// <returns>A <see cref="JsonViewComponentResult"/>.</returns>
         /// <remarks>Callers should cache an instance of <see cref="JsonSerializerSettings"/> to avoid
         /// recreating cached data with each call.</remarks>
-        public JsonViewComponentResult Json(object value, [NotNull] JsonSerializerSettings serializerSettings)
+        public JsonViewComponentResult Json(object value, JsonSerializerSettings serializerSettings)
         {
+            if (serializerSettings == null)
+            {
+                throw new ArgumentNullException(nameof(serializerSettings));
+            }
+
             return new JsonViewComponentResult(value, serializerSettings);
         }
 

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponentResult.cs

@@ -6,7 +6,6 @@ using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.AspNet.Mvc.ViewComponents;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Mvc.ViewFeatures.Internal;

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/ContentViewComponentResult.cs

@@ -1,10 +1,10 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Net;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -26,8 +26,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// Initializes a new <see cref="ContentViewComponentResult"/>.
         /// </summary>
         /// <param name="content">Content to write. The content be HTML encoded when output.</param>
-        public ContentViewComponentResult([NotNull] string content)
+        public ContentViewComponentResult(string content)
         {
+            if (content == null)
+            {
+                throw new ArgumentNullException(nameof(content));
+            }
+
             Content = content;
             EncodedContent = new HtmlString(WebUtility.HtmlEncode(content));
         }
@@ -39,8 +44,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// Content to write. The content is treated as already HTML encoded, and no further encoding
         /// will be performed.
         /// </param>
-        public ContentViewComponentResult([NotNull] HtmlString encodedContent)
+        public ContentViewComponentResult(HtmlString encodedContent)
         {
+            if (encodedContent == null)
+            {
+                throw new ArgumentNullException(nameof(encodedContent));
+            }
+
             EncodedContent = encodedContent;
             Content = WebUtility.HtmlDecode(encodedContent.ToString());
         }
@@ -59,8 +69,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// Writes the <see cref="EncodedContent"/>.
         /// </summary>
         /// <param name="context">The <see cref="ViewComponentContext"/>.</param>
-        public void Execute([NotNull] ViewComponentContext context)
+        public void Execute(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             context.Writer.Write(EncodedContent.ToString());
         }
 
@@ -69,8 +84,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// </summary>
         /// <param name="context">The <see cref="ViewComponentContext"/>.</param>
         /// <returns>A completed <see cref="Task"/>.</returns>
-        public Task ExecuteAsync([NotNull] ViewComponentContext context)
+        public Task ExecuteAsync(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             return context.Writer.WriteAsync(EncodedContent.ToString());
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/DefaultViewComponentActivator.cs

@@ -35,8 +35,18 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         }
 
         /// <inheritdoc />
-        public virtual void Activate([NotNull] object viewComponent, [NotNull] ViewComponentContext context)
+        public virtual void Activate(object viewComponent, ViewComponentContext context)
         {
+            if (viewComponent == null)
+            {
+                throw new ArgumentNullException(nameof(viewComponent));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var propertiesToActivate = _injectActions.GetOrAdd(
                 viewComponent.GetType(),
                 _getPropertiesToActivate);

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/DefaultViewComponentDescriptorProvider.cs

@@ -1,11 +1,11 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
 using Microsoft.AspNet.Mvc.Infrastructure;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -53,8 +53,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// <returns>
         /// <c>true</c> if <paramref name="typeInfo"/>represents a View Component class, otherwise <c>false</c>.
         /// </returns>
-        protected virtual bool IsViewComponentType([NotNull] TypeInfo typeInfo)
+        protected virtual bool IsViewComponentType(TypeInfo typeInfo)
         {
+            if (typeInfo == null)
+            {
+                throw new ArgumentNullException(nameof(typeInfo));
+            }
+
             return ViewComponentConventions.IsComponent(typeInfo);
         }
 

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/DefaultViewComponentHelper.cs

@@ -7,7 +7,6 @@ using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Mvc.ViewFeatures.Internal;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -19,22 +18,47 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         private ViewContext _viewContext;
 
         public DefaultViewComponentHelper(
-            [NotNull] IViewComponentDescriptorCollectionProvider descriptorProvider,
-            [NotNull] IViewComponentSelector selector,
-            [NotNull] IViewComponentInvokerFactory invokerFactory)
+            IViewComponentDescriptorCollectionProvider descriptorProvider,
+            IViewComponentSelector selector,
+            IViewComponentInvokerFactory invokerFactory)
         {
+            if (descriptorProvider == null)
+            {
+                throw new ArgumentNullException(nameof(descriptorProvider));
+            }
+
+            if (selector == null)
+            {
+                throw new ArgumentNullException(nameof(selector));
+            }
+
+            if (invokerFactory == null)
+            {
+                throw new ArgumentNullException(nameof(invokerFactory));
+            }
+
             _descriptorProvider = descriptorProvider;
             _selector = selector;
             _invokerFactory = invokerFactory;
         }
 
-        public void Contextualize([NotNull] ViewContext viewContext)
+        public void Contextualize(ViewContext viewContext)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             _viewContext = viewContext;
         }
 
-        public HtmlString Invoke([NotNull] string name, params object[] arguments)
+        public HtmlString Invoke(string name, params object[] arguments)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             var descriptor = SelectComponent(name);
 
             using (var writer = new StringWriter())
@@ -44,8 +68,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             }
         }
 
-        public HtmlString Invoke([NotNull] Type componentType, params object[] arguments)
+        public HtmlString Invoke(Type componentType, params object[] arguments)
         {
+            if (componentType == null)
+            {
+                throw new ArgumentNullException(nameof(componentType));
+            }
+
             var descriptor = SelectComponent(componentType);
 
             using (var writer = new StringWriter())
@@ -55,20 +84,35 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             }
         }
 
-        public void RenderInvoke([NotNull] string name, params object[] arguments)
+        public void RenderInvoke(string name, params object[] arguments)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             var descriptor = SelectComponent(name);
             InvokeCore(_viewContext.Writer, descriptor, arguments);
         }
 
-        public void RenderInvoke([NotNull] Type componentType, params object[] arguments)
+        public void RenderInvoke(Type componentType, params object[] arguments)
         {
+            if (componentType == null)
+            {
+                throw new ArgumentNullException(nameof(componentType));
+            }
+
             var descriptor = SelectComponent(componentType);
             InvokeCore(_viewContext.Writer, descriptor, arguments);
         }
 
-        public async Task<HtmlString> InvokeAsync([NotNull] string name, params object[] arguments)
+        public async Task<HtmlString> InvokeAsync(string name, params object[] arguments)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             var descriptor = SelectComponent(name);
 
             using (var writer = new StringWriter())
@@ -78,8 +122,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             }
         }
 
-        public async Task<HtmlString> InvokeAsync([NotNull] Type componentType, params object[] arguments)
+        public async Task<HtmlString> InvokeAsync(Type componentType, params object[] arguments)
         {
+            if (componentType == null)
+            {
+                throw new ArgumentNullException(nameof(componentType));
+            }
+
             var descriptor = SelectComponent(componentType);
 
             using (var writer = new StringWriter())
@@ -89,14 +138,24 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             }
         }
 
-        public Task RenderInvokeAsync([NotNull] string name, params object[] arguments)
+        public Task RenderInvokeAsync(string name, params object[] arguments)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             var descriptor = SelectComponent(name);
             return InvokeCoreAsync(_viewContext.Writer, descriptor, arguments);
         }
 
-        public Task RenderInvokeAsync([NotNull] Type componentType, params object[] arguments)
+        public Task RenderInvokeAsync(Type componentType, params object[] arguments)
         {
+            if (componentType == null)
+            {
+                throw new ArgumentNullException(nameof(componentType));
+            }
+
             var descriptor = SelectComponent(componentType);
             return InvokeCoreAsync(_viewContext.Writer, descriptor, arguments);
         }
@@ -128,10 +187,20 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         }
 
         private Task InvokeCoreAsync(
-            [NotNull] TextWriter writer,
-            [NotNull] ViewComponentDescriptor descriptor,
+            TextWriter writer,
+            ViewComponentDescriptor descriptor,
             object[] arguments)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (descriptor == null)
+            {
+                throw new ArgumentNullException(nameof(descriptor));
+            }
+
             var context = new ViewComponentContext(descriptor, arguments, _viewContext, writer);
 
             var invoker = _invokerFactory.CreateInstance(context);
@@ -145,10 +214,20 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         }
 
         private void InvokeCore(
-            [NotNull] TextWriter writer,
-            [NotNull] ViewComponentDescriptor descriptor,
+            TextWriter writer,
+            ViewComponentDescriptor descriptor,
             object[] arguments)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (descriptor == null)
+            {
+                throw new ArgumentNullException(nameof(descriptor));
+            }
+
             var context = new ViewComponentContext(descriptor, arguments, _viewContext, writer);
 
             var invoker = _invokerFactory.CreateInstance(context);

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/DefaultViewComponentInvoker.cs

@@ -9,7 +9,6 @@ using Microsoft.AspNet.Mvc.Controllers;
 using Microsoft.AspNet.Mvc.Infrastructure;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -19,15 +18,30 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         private readonly IViewComponentActivator _viewComponentActivator;
 
         public DefaultViewComponentInvoker(
-            [NotNull] ITypeActivatorCache typeActivatorCache,
-            [NotNull] IViewComponentActivator viewComponentActivator)
+            ITypeActivatorCache typeActivatorCache,
+            IViewComponentActivator viewComponentActivator)
         {
+            if (typeActivatorCache == null)
+            {
+                throw new ArgumentNullException(nameof(typeActivatorCache));
+            }
+
+            if (viewComponentActivator == null)
+            {
+                throw new ArgumentNullException(nameof(viewComponentActivator));
+            }
+
             _typeActivatorCache = typeActivatorCache;
             _viewComponentActivator = viewComponentActivator;
         }
 
-        public void Invoke([NotNull] ViewComponentContext context)
+        public void Invoke(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var method = ViewComponentMethodSelector.FindSyncMethod(
                 context.ViewComponentDescriptor.Type.GetTypeInfo(),
                 context.Arguments);
@@ -41,8 +55,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             result.Execute(context);
         }
 
-        public async Task InvokeAsync([NotNull] ViewComponentContext context)
+        public async Task InvokeAsync(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             IViewComponentResult result;
 
             var asyncMethod = ViewComponentMethodSelector.FindAsyncMethod(
@@ -74,20 +93,35 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             await result.ExecuteAsync(context);
         }
 
-        private object CreateComponent([NotNull] ViewComponentContext context)
+        private object CreateComponent(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var services = context.ViewContext.HttpContext.RequestServices;
             var component = _typeActivatorCache.CreateInstance<object>(
-                services, 
+                services,
                 context.ViewComponentDescriptor.Type);
             _viewComponentActivator.Activate(component, context);
             return component;
         }
 
         private async Task<IViewComponentResult> InvokeAsyncCore(
-            [NotNull] MethodInfo method,
-            [NotNull] ViewComponentContext context)
+            MethodInfo method,
+            ViewComponentContext context)
         {
+            if (method == null)
+            {
+                throw new ArgumentNullException(nameof(method));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var component = CreateComponent(context);
 
             var result = await ControllerActionExecutor.ExecuteAsync(method, component, context.Arguments);
@@ -95,8 +129,18 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             return CoerceToViewComponentResult(result);
         }
 
-        public IViewComponentResult InvokeSyncCore([NotNull] MethodInfo method, [NotNull] ViewComponentContext context)
+        public IViewComponentResult InvokeSyncCore(MethodInfo method, ViewComponentContext context)
         {
+            if (method == null)
+            {
+                throw new ArgumentNullException(nameof(method));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var component = CreateComponent(context);
 
             object result = null;

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/DefaultViewComponentInvokerFactory.cs

@@ -1,8 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using Microsoft.AspNet.Mvc.Infrastructure;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -23,8 +23,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         // We don't currently make use of the descriptor or the arguments here (they are available on the context).
         // We might do this some day to cache which method we select, so resist the urge to 'clean' this without
         // considering that possibility.
-        public IViewComponentInvoker CreateInstance([NotNull] ViewComponentContext context)
+        public IViewComponentInvoker CreateInstance(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             return new DefaultViewComponentInvoker(
                 _typeActivatorCache,
                 _viewComponentActivator);

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/DefaultViewComponentSelector.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -28,8 +27,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         }
 
         /// <inheritdoc />
-        public ViewComponentDescriptor SelectComponent([NotNull] string componentName)
+        public ViewComponentDescriptor SelectComponent(string componentName)
         {
+            if (componentName == null)
+            {
+                throw new ArgumentNullException(nameof(componentName));
+            }
+
             var collection = _descriptorProvider.ViewComponents;
             if (_cache == null || _cache.Version != collection.Version)
             {

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/IViewComponentInvoker.cs

@@ -2,14 +2,13 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Threading.Tasks;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
     public interface IViewComponentInvoker
     {
-        void Invoke([NotNull] ViewComponentContext context);
+        void Invoke(ViewComponentContext context);
 
-        Task InvokeAsync([NotNull] ViewComponentContext context);
+        Task InvokeAsync(ViewComponentContext context);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/IViewComponentInvokerFactory.cs

@@ -1,12 +1,10 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Microsoft.Framework.Internal;
-
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
     public interface IViewComponentInvokerFactory
     {
-        IViewComponentInvoker CreateInstance([NotNull] ViewComponentContext context);
+        IViewComponentInvoker CreateInstance(ViewComponentContext context);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/IViewComponentSelector.cs

@@ -1,8 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Microsoft.Framework.Internal;
-
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
     /// <summary>
@@ -15,6 +13,6 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// </summary>
         /// <param name="componentName">The View Component name.</param>
         /// <returns>A <see cref="ViewComponentDescriptor"/>, or <c>null</c> if no match is found.</returns>
-        ViewComponentDescriptor SelectComponent([NotNull] string componentName);
+        ViewComponentDescriptor SelectComponent(string componentName);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/JsonViewComponentResult.cs

@@ -1,9 +1,9 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Threading.Tasks;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
 using Newtonsoft.Json;
 
@@ -31,8 +31,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// <param name="value">The value to format as JSON text.</param>
         /// <param name="serializerSettings">The <see cref="JsonSerializerSettings"/> to be used by
         /// the formatter.</param>
-        public JsonViewComponentResult(object value, [NotNull] JsonSerializerSettings serializerSettings)
+        public JsonViewComponentResult(object value, JsonSerializerSettings serializerSettings)
         {
+            if (serializerSettings == null)
+            {
+                throw new ArgumentNullException(nameof(serializerSettings));
+            }
+
             Value = value;
             _serializerSettings = serializerSettings;
         }
@@ -46,8 +51,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// Renders JSON text to the output.
         /// </summary>
         /// <param name="context">The <see cref="ViewComponentContext"/>.</param>
-        public void Execute([NotNull] ViewComponentContext context)
+        public void Execute(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var serializerSettings = _serializerSettings;
             if (serializerSettings == null)
             {
@@ -73,8 +83,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// </summary>
         /// <param name="context">The <see cref="ViewComponentContext"/>.</param>
         /// <returns>A completed <see cref="Task"/>.</returns>
-        public Task ExecuteAsync([NotNull] ViewComponentContext context)
+        public Task ExecuteAsync(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             Execute(context);
             return Task.FromResult(true);
         }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/ViewComponentContext.cs

@@ -1,10 +1,10 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.IO;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -36,11 +36,31 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// <param name="viewContext">The <see cref="ViewContext"/>.</param>
         /// <param name="writer">The <see cref="TextWriter"/> for writing output.</param>
         public ViewComponentContext(
-            [NotNull] ViewComponentDescriptor viewComponentDescriptor,
-            [NotNull] object[] arguments,
-            [NotNull] ViewContext viewContext,
-            [NotNull] TextWriter writer)
+            ViewComponentDescriptor viewComponentDescriptor,
+            object[] arguments,
+            ViewContext viewContext,
+            TextWriter writer)
         {
+            if (viewComponentDescriptor == null)
+            {
+                throw new ArgumentNullException(nameof(viewComponentDescriptor));
+            }
+
+            if (arguments == null)
+            {
+                throw new ArgumentNullException(nameof(arguments));
+            }
+
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
             ViewComponentDescriptor = viewComponentDescriptor;
             Arguments = arguments;
 
@@ -48,7 +68,7 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             // aren't visible in the calling view.
             ViewContext = new ViewContext(
                 viewContext,
-                viewContext.View, 
+                viewContext.View,
                 new ViewDataDictionary(viewContext.ViewData),
                 writer);
         }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/ViewComponentConventions.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Reflection;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -11,8 +10,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
     {
         private const string ViewComponentSuffix = "ViewComponent";
 
-        public static string GetComponentName([NotNull] TypeInfo componentType)
+        public static string GetComponentName(TypeInfo componentType)
         {
+            if (componentType == null)
+            {
+                throw new ArgumentNullException(nameof(componentType));
+            }
+
             var attribute = componentType.GetCustomAttribute<ViewComponentAttribute>();
             if (attribute != null && !string.IsNullOrEmpty(attribute.Name))
             {
@@ -30,8 +34,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             return GetShortNameByConvention(componentType);
         }
 
-        public static string GetComponentFullName([NotNull] TypeInfo componentType)
+        public static string GetComponentFullName(TypeInfo componentType)
         {
+            if (componentType == null)
+            {
+                throw new ArgumentNullException(nameof(componentType));
+            }
+
             var attribute = componentType.GetCustomAttribute<ViewComponentAttribute>();
             if (!string.IsNullOrEmpty(attribute?.Name))
             {
@@ -63,8 +72,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             }
         }
 
-        public static bool IsComponent([NotNull] TypeInfo typeInfo)
+        public static bool IsComponent(TypeInfo typeInfo)
         {
+            if (typeInfo == null)
+            {
+                throw new ArgumentNullException(nameof(typeInfo));
+            }
+
             if (!typeInfo.IsClass ||
                 !typeInfo.IsPublic ||
                 typeInfo.IsAbstract ||

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/ViewComponentDescriptorCollection.cs

@@ -1,8 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Collections.Generic;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -16,8 +16,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// </summary>
         /// <param name="items">The result of view component discovery</param>
         /// <param name="version">The unique version of discovered view components.</param>
-        public ViewComponentDescriptorCollection([NotNull] IEnumerable<ViewComponentDescriptor> items, int version)
+        public ViewComponentDescriptorCollection(IEnumerable<ViewComponentDescriptor> items, int version)
         {
+            if (items == null)
+            {
+                throw new ArgumentNullException(nameof(items));
+            }
+
             Items = new List<ViewComponentDescriptor>(items);
             Version = version;
         }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/ViewComponentMethodSelector.cs

@@ -6,7 +6,6 @@ using System.Linq.Expressions;
 using System.Reflection;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -15,8 +14,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         public const string AsyncMethodName = "InvokeAsync";
         public const string SyncMethodName = "Invoke";
 
-        public static MethodInfo FindAsyncMethod([NotNull] TypeInfo componentType, object[] args)
+        public static MethodInfo FindAsyncMethod(TypeInfo componentType, object[] args)
         {
+            if (componentType == null)
+            {
+                throw new ArgumentNullException(nameof(componentType));
+            }
+
             var method = GetMethod(componentType, args, AsyncMethodName);
             if (method == null)
             {
@@ -33,8 +37,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
             return method;
         }
 
-        public static MethodInfo FindSyncMethod([NotNull] TypeInfo componentType, object[] args)
+        public static MethodInfo FindSyncMethod(TypeInfo componentType, object[] args)
         {
+            if (componentType == null)
+            {
+                throw new ArgumentNullException(nameof(componentType));
+            }
+
             var method = GetMethod(componentType, args, SyncMethodName);
             if (method == null)
             {

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewComponents/ViewViewComponentResult.cs

@@ -8,7 +8,6 @@ using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
 {
@@ -49,8 +48,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// <remarks>
         /// This method synchronously calls and blocks on <see cref="ExecuteAsync(ViewComponentContext)"/>.
         /// </remarks>
-        public void Execute([NotNull] ViewComponentContext context)
+        public void Execute(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var task = ExecuteAsync(context);
             task.GetAwaiter().GetResult();
         }
@@ -61,8 +65,13 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
         /// </summary>
         /// <param name="context">The <see cref="ViewComponentContext"/> for the current component execution.</param>
         /// <returns>A <see cref="Task"/> which will complete when view rendering is completed.</returns>
-        public async Task ExecuteAsync([NotNull] ViewComponentContext context)
+        public async Task ExecuteAsync(ViewComponentContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var viewEngine = ViewEngine ?? ResolveViewEngine(context);
             var viewData = ViewData ?? context.ViewData;
             var isNullOrEmptyViewName = string.IsNullOrEmpty(ViewName);

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewEngines/CompositeViewEngine.cs

@@ -1,9 +1,9 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
 
 namespace Microsoft.AspNet.Mvc.ViewEngines
@@ -25,17 +25,37 @@ namespace Microsoft.AspNet.Mvc.ViewEngines
 
         /// <inheritdoc />
         public ViewEngineResult FindPartialView(
-            [NotNull] ActionContext context,
-            [NotNull] string partialViewName)
+            ActionContext context,
+            string partialViewName)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return FindView(context, partialViewName, partial: true);
         }
 
         /// <inheritdoc />
         public ViewEngineResult FindView(
-            [NotNull] ActionContext context,
-            [NotNull] string viewName)
+            ActionContext context,
+            string viewName)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (viewName == null)
+            {
+                throw new ArgumentNullException(nameof(viewName));
+            }
+
             return FindView(context, viewName, partial: false);
         }
 

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewEngines/IView.cs

@@ -3,7 +3,6 @@
 
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewEngines
 {
@@ -22,6 +21,6 @@ namespace Microsoft.AspNet.Mvc.ViewEngines
         /// </summary>
         /// <param name="context">The <see cref="ViewContext"/>.</param>
         /// <returns>A <see cref="Task"/> that on completion renders the view.</returns>
-        Task RenderAsync([NotNull] ViewContext context);
+        Task RenderAsync(ViewContext context);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewEngines/ViewEngineResult.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewEngines
 {
@@ -26,9 +25,19 @@ namespace Microsoft.AspNet.Mvc.ViewEngines
         }
 
         public static ViewEngineResult NotFound(
-            [NotNull] string viewName,
-            [NotNull] IEnumerable<string> searchedLocations)
+            string viewName,
+            IEnumerable<string> searchedLocations)
         {
+            if (viewName == null)
+            {
+                throw new ArgumentNullException(nameof(viewName));
+            }
+
+            if (searchedLocations == null)
+            {
+                throw new ArgumentNullException(nameof(searchedLocations));
+            }
+
             return new ViewEngineResult
             {
                 SearchedLocations = searchedLocations,
@@ -36,8 +45,18 @@ namespace Microsoft.AspNet.Mvc.ViewEngines
             };
         }
 
-        public static ViewEngineResult Found([NotNull] string viewName, [NotNull] IView view)
+        public static ViewEngineResult Found(string viewName, IView view)
         {
+            if (viewName == null)
+            {
+                throw new ArgumentNullException(nameof(viewName));
+            }
+
+            if (view == null)
+            {
+                throw new ArgumentNullException(nameof(view));
+            }
+
             return new ViewEngineResult
             {
                 View = view,

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/CachedExpressionCompiler.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Concurrent;
 using System.Linq.Expressions;
 using System.Reflection;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -17,8 +16,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         // If the provided expression is particularly obscure and the system doesn't know
         // how to handle it, we'll just compile the expression as normal.
         public static Func<TModel, TResult> Process<TModel, TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression)
+            Expression<Func<TModel, TResult>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return Compiler<TModel, TResult>.Compile(expression);
         }
 
@@ -32,8 +36,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             private static readonly ConcurrentDictionary<MemberInfo, Func<object, TResult>> _constMemberAccessCache =
                 new ConcurrentDictionary<MemberInfo, Func<object, TResult>>();
 
-            public static Func<TModel, TResult> Compile([NotNull] Expression<Func<TModel, TResult>> expression)
+            public static Func<TModel, TResult> Compile(Expression<Func<TModel, TResult>> expression)
             {
+                if (expression == null)
+                {
+                    throw new ArgumentNullException(nameof(expression));
+                }
+
                 return CompileFromIdentityFunc(expression)
                        ?? CompileFromConstLookup(expression)
                        ?? CompileFromMemberAccess(expression)
@@ -41,8 +50,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             }
 
             private static Func<TModel, TResult> CompileFromConstLookup(
-                [NotNull] Expression<Func<TModel, TResult>> expression)
+                Expression<Func<TModel, TResult>> expression)
             {
+                if (expression == null)
+                {
+                    throw new ArgumentNullException(nameof(expression));
+                }
+
                 var constantExpression = expression.Body as ConstantExpression;
                 if (constantExpression != null)
                 {
@@ -56,8 +70,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             }
 
             private static Func<TModel, TResult> CompileFromIdentityFunc(
-                [NotNull] Expression<Func<TModel, TResult>> expression)
+                Expression<Func<TModel, TResult>> expression)
             {
+                if (expression == null)
+                {
+                    throw new ArgumentNullException(nameof(expression));
+                }
+
                 if (expression.Body == expression.Parameters[0])
                 {
                     // model => model
@@ -75,8 +94,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             }
 
             private static Func<TModel, TResult> CompileFromMemberAccess(
-                [NotNull] Expression<Func<TModel, TResult>> expression)
+                Expression<Func<TModel, TResult>> expression)
             {
+                if (expression == null)
+                {
+                    throw new ArgumentNullException(nameof(expression));
+                }
+
                 // Performance tests show that on the x64 platform, special-casing static member and
                 // captured local variable accesses is faster than letting the fingerprinting system
                 // handle them. On the x86 platform, the fingerprinting system is faster, but only
@@ -118,8 +142,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 return null;
             }
 
-            private static Func<TModel, TResult> CompileSlow([NotNull] Expression<Func<TModel, TResult>> expression)
+            private static Func<TModel, TResult> CompileSlow(Expression<Func<TModel, TResult>> expression)
             {
+                if (expression == null)
+                {
+                    throw new ArgumentNullException(nameof(expression));
+                }
+
                 // fallback compilation system - just compile the expression directly
                 return expression.Compile();
             }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/DefaultEditorTemplates.cs

@@ -280,7 +280,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
                     var valueDivTag = new TagBuilder("div");
                     valueDivTag.AddCssClass("editor-field");
-                    
+
                     valueDivTag.InnerHtml.Append(templateBuilderResult);
                     valueDivTag.InnerHtml.AppendEncoded(" ");
                     valueDivTag.InnerHtml.Append(htmlHelper.ValidationMessage(
@@ -365,13 +365,23 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             return GenerateTextBox(htmlHelper, inputType: "number");
         }
 
-        public static IHtmlContent FileInputTemplate([NotNull] IHtmlHelper htmlHelper)
+        public static IHtmlContent FileInputTemplate(IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             return GenerateTextBox(htmlHelper, inputType: "file");
         }
 
-        public static IHtmlContent FileCollectionInputTemplate([NotNull] IHtmlHelper htmlHelper)
+        public static IHtmlContent FileCollectionInputTemplate(IHtmlHelper htmlHelper)
         {
+            if (htmlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelper));
+            }
+
             var htmlAttributes =
                 CreateHtmlAttributes(htmlHelper, className: "text-box single-line", inputType: "file");
             htmlAttributes["multiple"] = "multiple";

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/DefaultHtmlGenerator.cs

@@ -13,7 +13,6 @@ using Microsoft.AspNet.Html.Abstractions;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.ModelBinding.Validation;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.AspNet.Mvc.Routing;
 using Microsoft.AspNet.Mvc.ViewFeatures.Internal;
 using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
@@ -43,12 +42,37 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <param name="urlHelper">The <see cref="IUrlHelper"/>.</param>
         /// <param name="htmlEncoder">The <see cref="IHtmlEncoder"/>.</param>
         public DefaultHtmlGenerator(
-            [NotNull] IAntiforgery antiforgery,
-            [NotNull] IOptions<MvcViewOptions> optionsAccessor,
-            [NotNull] IModelMetadataProvider metadataProvider,
-            [NotNull] IUrlHelper urlHelper,
-            [NotNull] IHtmlEncoder htmlEncoder)
+            IAntiforgery antiforgery,
+            IOptions<MvcViewOptions> optionsAccessor,
+            IModelMetadataProvider metadataProvider,
+            IUrlHelper urlHelper,
+            IHtmlEncoder htmlEncoder)
         {
+            if (antiforgery == null)
+            {
+                throw new ArgumentNullException(nameof(antiforgery));
+            }
+
+            if (optionsAccessor == null)
+            {
+                throw new ArgumentNullException(nameof(optionsAccessor));
+            }
+
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
+
+            if (urlHelper == null)
+            {
+                throw new ArgumentNullException(nameof(urlHelper));
+            }
+
+            if (htmlEncoder == null)
+            {
+                throw new ArgumentNullException(nameof(htmlEncoder));
+            }
+
             _antiforgery = antiforgery;
             var clientValidatorProviders = optionsAccessor.Value.ClientModelValidatorProviders;
             _clientModelValidatorProvider = new CompositeClientModelValidatorProvider(clientValidatorProviders);
@@ -83,7 +107,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateActionLink(
-            [NotNull] string linkText,
+            string linkText,
             string actionName,
             string controllerName,
             string protocol,
@@ -92,25 +116,40 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object routeValues,
             object htmlAttributes)
         {
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             var url = _urlHelper.Action(actionName, controllerName, routeValues, protocol, hostname, fragment);
             return GenerateLink(linkText, url, htmlAttributes);
         }
 
         /// <inheritdoc />
-        public virtual IHtmlContent GenerateAntiforgery([NotNull] ViewContext viewContext)
+        public virtual IHtmlContent GenerateAntiforgery(ViewContext viewContext)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var tag = _antiforgery.GetHtml(viewContext.HttpContext);
             return new HtmlString(tag);
         }
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateCheckBox(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             bool? isChecked,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             if (modelExplorer != null)
             {
                 // CheckBoxFor() case. That API does not support passing isChecked directly.
@@ -150,10 +189,15 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateHiddenForCheckbox(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var tagBuilder = new TagBuilder("input");
             tagBuilder.MergeAttribute("type", GetInputTypeString(InputType.Hidden));
             tagBuilder.MergeAttribute("value", "false");
@@ -167,13 +211,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateForm(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             string actionName,
             string controllerName,
             object routeValues,
             string method,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var defaultMethod = false;
             if (string.IsNullOrEmpty(method))
             {
@@ -203,12 +252,17 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public TagBuilder GenerateRouteForm(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             string routeName,
             object routeValues,
             string method,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var action =
                 _urlHelper.RouteUrl(routeName, values: routeValues, protocol: null, host: null, fragment: null);
 
@@ -217,13 +271,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateHidden(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             object value,
             bool useViewData,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             // Special-case opaque values and arbitrary binary data.
             var byteArrayValue = value as byte[];
             if (byteArrayValue != null)
@@ -248,12 +307,22 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateLabel(
-            [NotNull] ViewContext viewContext,
-            [NotNull] ModelExplorer modelExplorer,
+            ViewContext viewContext,
+            ModelExplorer modelExplorer,
             string expression,
             string labelText,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
+            if (modelExplorer == null)
+            {
+                throw new ArgumentNullException(nameof(modelExplorer));
+            }
+
             var resolvedLabelText = labelText ??
                 modelExplorer.Metadata.DisplayName ??
                 modelExplorer.Metadata.PropertyName;
@@ -280,12 +349,17 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GeneratePassword(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             object value,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var htmlAttributeDictionary = GetHtmlAttributeDictionaryOrNull(htmlAttributes);
             return GenerateInput(
                 viewContext,
@@ -303,13 +377,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateRadioButton(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             object value,
             bool? isChecked,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var htmlAttributeDictionary = GetHtmlAttributeDictionaryOrNull(htmlAttributes);
             if (modelExplorer == null)
             {
@@ -367,7 +446,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateRouteLink(
-            [NotNull] string linkText,
+            string linkText,
             string routeName,
             string protocol,
             string hostName,
@@ -375,13 +454,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object routeValues,
             object htmlAttributes)
         {
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             var url = _urlHelper.RouteUrl(routeName, routeValues, protocol, hostName, fragment);
             return GenerateLink(linkText, url, htmlAttributes);
         }
 
         /// <inheritdoc />
         public TagBuilder GenerateSelect(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string optionLabel,
             string expression,
@@ -389,6 +473,11 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             bool allowMultiple,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var currentValues = GetCurrentValues(viewContext, modelExplorer, expression, allowMultiple);
             return GenerateSelect(
                 viewContext,
@@ -403,7 +492,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateSelect(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string optionLabel,
             string expression,
@@ -412,6 +501,11 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             bool allowMultiple,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var fullName = GetFullHtmlFieldName(viewContext, expression);
             if (string.IsNullOrEmpty(fullName))
             {
@@ -423,7 +517,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                         nameof(IHtmlHelper<object>.EditorFor),
                         "htmlFieldName"),
                     nameof(expression));
-        }
+            }
 
             // If we got a null selectList, try to use ViewData to get the list of items.
             if (selectList == null)
@@ -468,13 +562,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateTextArea(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             int rows,
             int columns,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             if (rows < 0)
             {
                 throw new ArgumentOutOfRangeException(nameof(rows), Resources.HtmlHelper_TextAreaParameterOutOfRange);
@@ -545,13 +644,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateTextBox(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             object value,
             string format,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var htmlAttributeDictionary = GetHtmlAttributeDictionaryOrNull(htmlAttributes);
             return GenerateInput(
                 viewContext,
@@ -569,12 +673,17 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateValidationMessage(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             string expression,
             string message,
             string tag,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var fullName = GetFullHtmlFieldName(viewContext, expression);
             if (string.IsNullOrEmpty(fullName))
             {
@@ -649,12 +758,17 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual TagBuilder GenerateValidationSummary(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             bool excludePropertyErrors,
             string message,
             string headerTag,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var formContext = viewContext.ClientValidationEnabled ? viewContext.FormContext : null;
             if (viewContext.ViewData.ModelState.IsValid && (formContext == null || excludePropertyErrors))
             {
@@ -717,7 +831,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             {
                 tagBuilder.AddCssClass(HtmlHelper.ValidationSummaryCssClassName);
             }
-            
+
             tagBuilder.InnerHtml.Append(wrappedMessage);
             tagBuilder.InnerHtml.Append(htmlSummary);
 
@@ -732,10 +846,15 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IEnumerable<ModelClientValidationRule> GetClientValidationRules(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             modelExplorer = modelExplorer ??
                 ExpressionMetadataProvider.FromStringExpression(expression, viewContext.ViewData, _metadataProvider);
             var validationContext = new ClientModelValidationContext(
@@ -752,11 +871,16 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public virtual IReadOnlyCollection<string> GetCurrentValues(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             bool allowMultiple)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var fullName = GetFullHtmlFieldName(viewContext, expression);
             if (string.IsNullOrEmpty(fullName))
             {
@@ -953,11 +1077,16 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// A <see cref="TagBuilder"/> instance for the &lt;/form&gt; element.
         /// </returns>
         protected virtual TagBuilder GenerateFormCore(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             string action,
             string method,
             object htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             var tagBuilder = new TagBuilder("form");
             tagBuilder.MergeAttributes(GetHtmlAttributeDictionaryOrNull(htmlAttributes));
 
@@ -978,7 +1107,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         protected virtual TagBuilder GenerateInput(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             InputType inputType,
             ModelExplorer modelExplorer,
             string expression,
@@ -990,6 +1119,11 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             string format,
             IDictionary<string, object> htmlAttributes)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             // Not valid to use TextBoxForModel() and so on in a top-level view; would end up with an unnamed input
             // elements. But we support the *ForModel() methods in any lower-level template, once HtmlFieldPrefix is
             // non-empty.
@@ -1104,10 +1238,15 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         protected virtual TagBuilder GenerateLink(
-            [NotNull] string linkText,
-            [NotNull] string url,
+            string linkText,
+            string url,
             object htmlAttributes)
         {
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             var tagBuilder = new TagBuilder("a");
             tagBuilder.InnerHtml.SetContent(linkText);
 
@@ -1215,9 +1354,14 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         private static IEnumerable<SelectListItem> GetSelectListItems(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             string expression)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             // Method is called only if user did not pass a select list in. They must provide select list items in the
             // ViewData dictionary and definitely not as the Model. (Even if the Model datatype were correct, a
             // <select> element generated for a collection of SelectListItems would be useless.)
@@ -1311,7 +1455,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                     {
                         groupBuilder.InnerHtml.AppendLine(GenerateOption(item));
                     }
-                    
+
                     listItemBuilder.AppendLine(groupBuilder);
                 }
                 else

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/DynamicViewData.cs

@@ -4,8 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Dynamic;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -13,8 +11,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
     {
         private readonly Func<ViewDataDictionary> _viewDataFunc;
 
-        public DynamicViewData([NotNull] Func<ViewDataDictionary> viewDataFunc)
+        public DynamicViewData(Func<ViewDataDictionary> viewDataFunc)
         {
+            if (viewDataFunc == null)
+            {
+                throw new ArgumentNullException(nameof(viewDataFunc));
+            }
+
             _viewDataFunc = viewDataFunc;
         }
 
@@ -40,8 +43,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             return ViewData.Keys;
         }
 
-        public override bool TryGetMember([NotNull] GetMemberBinder binder, out object result)
+        public override bool TryGetMember(GetMemberBinder binder, out object result)
         {
+            if (binder == null)
+            {
+                throw new ArgumentNullException(nameof(binder));
+            }
+
             result = ViewData[binder.Name];
 
             // ViewDataDictionary[key] will never throw a KeyNotFoundException.
@@ -49,8 +57,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             return true;
         }
 
-        public override bool TrySetMember([NotNull] SetMemberBinder binder, object value)
+        public override bool TrySetMember(SetMemberBinder binder, object value)
         {
+            if (binder == null)
+            {
+                throw new ArgumentNullException(nameof(binder));
+            }
+
             ViewData[binder.Name] = value;
 
             // Can always add / update a ViewDataDictionary value.

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ExpressionHelper.cs

@@ -7,7 +7,6 @@ using System.Globalization;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -19,8 +18,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             return string.Equals(expression, "model", StringComparison.OrdinalIgnoreCase) ? string.Empty : expression;
         }
 
-        public static string GetExpressionText([NotNull] LambdaExpression expression)
+        public static string GetExpressionText(LambdaExpression expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             // Split apart the expression string for property/field accessors to create its name
             var nameParts = new Stack<string>();
             var part = expression.Body;
@@ -104,9 +108,19 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         private static string GetIndexerInvocation(
-            [NotNull] Expression expression,
-            [NotNull] ParameterExpression[] parameters)
+            Expression expression,
+            ParameterExpression[] parameters)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
+            if (parameters == null)
+            {
+                throw new ArgumentNullException(nameof(parameters));
+            }
+
             var converted = Expression.Convert(expression, typeof(object));
             var fakeParameter = Expression.Parameter(typeof(object), null);
             var lambda = Expression.Lambda<Func<object, object>>(converted, fakeParameter);

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ExpressionMetadataProvider.cs

@@ -6,18 +6,26 @@ using System.Globalization;
 using System.Linq.Expressions;
 using System.Reflection;
 using Microsoft.AspNet.Mvc.ModelBinding;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
     public static class ExpressionMetadataProvider
     {
         public static ModelExplorer FromLambdaExpression<TModel, TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
-            [NotNull] ViewDataDictionary<TModel> viewData,
+            Expression<Func<TModel, TResult>> expression,
+            ViewDataDictionary<TModel> viewData,
             IModelMetadataProvider metadataProvider)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
             string propertyName = null;
             Type containerType = null;
             var legalExpression = false;
@@ -103,9 +111,14 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </returns>
         public static ModelExplorer FromStringExpression(
             string expression,
-            [NotNull] ViewDataDictionary viewData,
+            ViewDataDictionary viewData,
             IModelMetadataProvider metadataProvider)
         {
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
             var viewDataInfo = ViewDataEvaluator.Eval(viewData, expression);
             if (viewDataInfo == null)
             {
@@ -160,9 +173,14 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         private static ModelExplorer FromModel(
-            [NotNull] ViewDataDictionary viewData,
+            ViewDataDictionary viewData,
             IModelMetadataProvider metadataProvider)
         {
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
             if (viewData.ModelMetadata.ModelType == typeof(object))
             {
                 // Use common simple type rather than object so e.g. Editor() at least generates a TextBox.

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/FormContext.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -30,16 +29,26 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             }
         }
 
-        public bool RenderedField([NotNull] string fieldName)
+        public bool RenderedField(string fieldName)
         {
+            if (fieldName == null)
+            {
+                throw new ArgumentNullException(nameof(fieldName));
+            }
+
             bool result;
             _renderedFields.TryGetValue(fieldName, out result);
 
             return result;
         }
 
-        public void RenderedField([NotNull] string fieldName, bool value)
+        public void RenderedField(string fieldName, bool value)
         {
+            if (fieldName == null)
+            {
+                throw new ArgumentNullException(nameof(fieldName));
+            }
+
             _renderedFields[fieldName] = value;
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/HtmlHelper.cs

@@ -40,13 +40,43 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// Initializes a new instance of the <see cref="HtmlHelper"/> class.
         /// </summary>
         public HtmlHelper(
-            [NotNull] IHtmlGenerator htmlGenerator,
-            [NotNull] ICompositeViewEngine viewEngine,
-            [NotNull] IModelMetadataProvider metadataProvider,
-            [NotNull] IHtmlEncoder htmlEncoder,
-            [NotNull] IUrlEncoder urlEncoder,
-            [NotNull] IJavaScriptStringEncoder javaScriptStringEncoder)
+            IHtmlGenerator htmlGenerator,
+            ICompositeViewEngine viewEngine,
+            IModelMetadataProvider metadataProvider,
+            IHtmlEncoder htmlEncoder,
+            IUrlEncoder urlEncoder,
+            IJavaScriptStringEncoder javaScriptStringEncoder)
         {
+            if (htmlGenerator == null)
+            {
+                throw new ArgumentNullException(nameof(htmlGenerator));
+            }
+
+            if (viewEngine == null)
+            {
+                throw new ArgumentNullException(nameof(viewEngine));
+            }
+
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
+
+            if (htmlEncoder == null)
+            {
+                throw new ArgumentNullException(nameof(htmlEncoder));
+            }
+
+            if (urlEncoder == null)
+            {
+                throw new ArgumentNullException(nameof(urlEncoder));
+            }
+
+            if (javaScriptStringEncoder == null)
+            {
+                throw new ArgumentNullException(nameof(javaScriptStringEncoder));
+            }
+
             _viewEngine = viewEngine;
             _htmlGenerator = htmlGenerator;
             _htmlEncoder = htmlEncoder;
@@ -184,14 +214,19 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             return dictionary;
         }
 
-        public virtual void Contextualize([NotNull] ViewContext viewContext)
+        public virtual void Contextualize(ViewContext viewContext)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             ViewContext = viewContext;
         }
 
         /// <inheritdoc />
         public IHtmlContent ActionLink(
-            [NotNull] string linkText,
+            string linkText,
             string actionName,
             string controllerName,
             string protocol,
@@ -200,6 +235,11 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object routeValues,
             object htmlAttributes)
         {
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             var tagBuilder = _htmlGenerator.GenerateActionLink(
                 linkText,
                 actionName,
@@ -277,8 +317,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public string GenerateIdFromName([NotNull] string fullName)
+        public string GenerateIdFromName(string fullName)
         {
+            if (fullName == null)
+            {
+                throw new ArgumentNullException(nameof(fullName));
+            }
+
             return TagBuilder.CreateSanitizedId(fullName, IdAttributeDotReplacement);
         }
 
@@ -360,8 +405,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public IEnumerable<SelectListItem> GetEnumSelectList([NotNull] Type enumType)
+        public IEnumerable<SelectListItem> GetEnumSelectList(Type enumType)
         {
+            if (enumType == null)
+            {
+                throw new ArgumentNullException(nameof(enumType));
+            }
+
             var metadata = MetadataProvider.GetMetadataForType(enumType);
             if (!metadata.IsEnum || metadata.IsFlagsEnum)
             {
@@ -421,10 +471,15 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public async Task<IHtmlContent> PartialAsync(
-            [NotNull] string partialViewName,
+            string partialViewName,
             object model,
             ViewDataDictionary viewData)
         {
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             using (var writer = new StringCollectionTextWriter(Encoding.UTF8))
             {
                 await RenderPartialCoreAsync(partialViewName, model, viewData, writer);
@@ -433,8 +488,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public Task RenderPartialAsync([NotNull] string partialViewName, object model, ViewDataDictionary viewData)
+        public Task RenderPartialAsync(string partialViewName, object model, ViewDataDictionary viewData)
         {
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             return RenderPartialCoreAsync(partialViewName, model, viewData, ViewContext.Writer);
         }
 
@@ -455,11 +515,16 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             return templateBuilder.Build();
         }
 
-        protected virtual async Task RenderPartialCoreAsync([NotNull] string partialViewName,
+        protected virtual async Task RenderPartialCoreAsync(string partialViewName,
                                                             object model,
                                                             ViewDataDictionary viewData,
                                                             TextWriter writer)
         {
+            if (partialViewName == null)
+            {
+                throw new ArgumentNullException(nameof(partialViewName));
+            }
+
             // Determine which ViewData we should use to construct a new ViewData
             var baseViewData = viewData ?? ViewData;
 
@@ -522,7 +587,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent RouteLink(
-            [NotNull] string linkText,
+            string linkText,
             string routeName,
             string protocol,
             string hostName,
@@ -530,6 +595,11 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object routeValues,
             object htmlAttributes)
         {
+            if (linkText == null)
+            {
+                throw new ArgumentNullException(nameof(linkText));
+            }
+
             var tagBuilder = _htmlGenerator.GenerateRouteLink(
                 linkText,
                 routeName,
@@ -647,8 +717,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             return new BufferedHtmlContent().Append(checkbox).Append(hidden);
         }
 
-        protected virtual string GenerateDisplayName([NotNull] ModelExplorer modelExplorer, string expression)
+        protected virtual string GenerateDisplayName(ModelExplorer modelExplorer, string expression)
         {
+            if (modelExplorer == null)
+            {
+                throw new ArgumentNullException(nameof(modelExplorer));
+            }
+
             // We don't call ModelMetadata.GetDisplayName here because
             // we want to fall back to the field name rather than the ModelType.
             // This is similar to how the GenerateLabel get the text of a label.
@@ -852,11 +927,16 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         protected virtual IHtmlContent GenerateLabel(
-            [NotNull] ModelExplorer modelExplorer,
+            ModelExplorer modelExplorer,
             string expression,
             string labelText,
             object htmlAttributes)
         {
+            if (modelExplorer == null)
+            {
+                throw new ArgumentNullException(nameof(modelExplorer));
+            }
+
             var tagBuilder = _htmlGenerator.GenerateLabel(
                 ViewContext,
                 modelExplorer,
@@ -1071,8 +1151,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// Thrown if <paramref name="metadata"/>'s <see cref="ModelMetadata.ModelType"/> is not an <see cref="Enum"/>
         /// or if it has a <see cref="FlagsAttribute"/>.
         /// </exception>
-        protected virtual IEnumerable<SelectListItem> GetEnumSelectList([NotNull] ModelMetadata metadata)
+        protected virtual IEnumerable<SelectListItem> GetEnumSelectList(ModelMetadata metadata)
         {
+            if (metadata == null)
+            {
+                throw new ArgumentNullException(nameof(metadata));
+            }
+
             if (!metadata.IsEnum || metadata.IsFlagsEnum)
             {
                 var message = Resources.FormatHtmlHelper_TypeNotSupported_ForGetEnumSelectList(

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/HtmlHelperOfT.cs

@@ -8,7 +8,6 @@ using Microsoft.AspNet.Html.Abstractions;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
@@ -19,21 +18,50 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// Initializes a new instance of the <see cref="HtmlHelper{TModel}"/> class.
         /// </summary>
         public HtmlHelper(
-            [NotNull] IHtmlGenerator htmlGenerator,
-            [NotNull] ICompositeViewEngine viewEngine,
-            [NotNull] IModelMetadataProvider metadataProvider,
-            [NotNull] IHtmlEncoder htmlEncoder,
-            [NotNull] IUrlEncoder urlEncoder,
-            [NotNull] IJavaScriptStringEncoder javaScriptStringEncoder)
+            IHtmlGenerator htmlGenerator,
+            ICompositeViewEngine viewEngine,
+            IModelMetadataProvider metadataProvider,
+            IHtmlEncoder htmlEncoder,
+            IUrlEncoder urlEncoder,
+            IJavaScriptStringEncoder javaScriptStringEncoder)
             : base(htmlGenerator, viewEngine, metadataProvider, htmlEncoder, urlEncoder, javaScriptStringEncoder)
         {
+            if (htmlGenerator == null)
+            {
+                throw new ArgumentNullException(nameof(htmlGenerator));
+            }
+            if (viewEngine == null)
+            {
+                throw new ArgumentNullException(nameof(viewEngine));
+            }
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
+            if (htmlEncoder == null)
+            {
+                throw new ArgumentNullException(nameof(htmlEncoder));
+            }
+            if (urlEncoder == null)
+            {
+                throw new ArgumentNullException(nameof(urlEncoder));
+            }
+            if (javaScriptStringEncoder == null)
+            {
+                throw new ArgumentNullException(nameof(javaScriptStringEncoder));
+            }
         }
 
         /// <inheritdoc />
         public new ViewDataDictionary<TModel> ViewData { get; private set; }
 
-        public override void Contextualize([NotNull] ViewContext viewContext)
+        public override void Contextualize(ViewContext viewContext)
         {
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
             if (viewContext.ViewData == null)
             {
                 throw new ArgumentException(Resources.FormatPropertyOfTypeCannotBeNull(
@@ -58,9 +86,14 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent CheckBoxFor(
-            [NotNull] Expression<Func<TModel, bool>> expression,
+            Expression<Func<TModel, bool>> expression,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GenerateCheckBox(modelExplorer, GetExpressionName(expression), isChecked: null,
                 htmlAttributes: htmlAttributes);
@@ -68,11 +101,16 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent DropDownListFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             IEnumerable<SelectListItem> selectList,
             string optionLabel,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = ExpressionMetadataProvider.FromLambdaExpression(expression, ViewData, MetadataProvider);
 
             return GenerateDropDown(modelExplorer, ExpressionHelper.GetExpressionText(expression), selectList,
@@ -81,11 +119,16 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent DisplayFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string templateName,
             string htmlFieldName,
             object additionalViewData)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = ExpressionMetadataProvider.FromLambdaExpression(expression,
                                                                            ViewData,
                                                                            MetadataProvider);
@@ -97,16 +140,26 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public string DisplayNameFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression)
+        public string DisplayNameFor<TResult>(Expression<Func<TModel, TResult>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GenerateDisplayName(modelExplorer, ExpressionHelper.GetExpressionText(expression));
         }
 
         /// <inheritdoc />
         public string DisplayNameForInnerType<TModelItem, TResult>(
-            [NotNull] Expression<Func<TModelItem, TResult>> expression)
+            Expression<Func<TModelItem, TResult>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = ExpressionMetadataProvider.FromLambdaExpression<TModelItem, TResult>(
                 expression,
                 new ViewDataDictionary<TModelItem>(ViewData, model: null),
@@ -122,18 +175,28 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public string DisplayTextFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression)
+        public string DisplayTextFor<TResult>(Expression<Func<TModel, TResult>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return GenerateDisplayText(GetModelExplorer(expression));
         }
 
         /// <inheritdoc />
         public IHtmlContent EditorFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string templateName,
             string htmlFieldName,
             object additionalViewData)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = ExpressionMetadataProvider.FromLambdaExpression(expression, ViewData, MetadataProvider);
 
             return GenerateEditor(
@@ -145,9 +208,14 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent HiddenFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GenerateHidden(
                 modelExplorer,
@@ -158,17 +226,27 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public string IdFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression)
+        public string IdFor<TResult>(Expression<Func<TModel, TResult>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return GenerateId(GetExpressionName(expression));
         }
 
         /// <inheritdoc />
         public IHtmlContent LabelFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string labelText,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GenerateLabel(
                 modelExplorer,
@@ -179,10 +257,15 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent ListBoxFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             IEnumerable<SelectListItem> selectList,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             var name = ExpressionHelper.GetExpressionText(expression);
 
@@ -190,17 +273,27 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public string NameFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression)
+        public string NameFor<TResult>(Expression<Func<TModel, TResult>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var expressionName = GetExpressionName(expression);
             return Name(expressionName);
         }
 
         /// <inheritdoc />
         public IHtmlContent PasswordFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GeneratePassword(
                 modelExplorer,
@@ -211,10 +304,20 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent RadioButtonFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
-            [NotNull] object value,
+            Expression<Func<TModel, TResult>> expression,
+            object value,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
+            if (value == null)
+            {
+                throw new ArgumentNullException(nameof(value));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GenerateRadioButton(
                 modelExplorer,
@@ -226,21 +329,31 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent TextAreaFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             int rows,
             int columns,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GenerateTextArea(modelExplorer, GetExpressionName(expression), rows, columns, htmlAttributes);
         }
 
         /// <inheritdoc />
         public IHtmlContent TextBoxFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string format,
             object htmlAttributes)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GenerateTextBox(
                 modelExplorer,
@@ -250,13 +363,23 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 htmlAttributes);
         }
 
-        protected string GetExpressionName<TResult>([NotNull] Expression<Func<TModel, TResult>> expression)
+        protected string GetExpressionName<TResult>(Expression<Func<TModel, TResult>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return ExpressionHelper.GetExpressionText(expression);
         }
 
-        protected ModelExplorer GetModelExplorer<TResult>([NotNull] Expression<Func<TModel, TResult>> expression)
+        protected ModelExplorer GetModelExplorer<TResult>(Expression<Func<TModel, TResult>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = ExpressionMetadataProvider.FromLambdaExpression(expression, ViewData, MetadataProvider);
             if (modelExplorer == null)
             {
@@ -269,11 +392,16 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         /// <inheritdoc />
         public IHtmlContent ValidationMessageFor<TResult>(
-            [NotNull] Expression<Func<TModel, TResult>> expression,
+            Expression<Func<TModel, TResult>> expression,
             string message,
             object htmlAttributes,
             string tag)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             return GenerateValidationMessage(ExpressionHelper.GetExpressionText(expression),
                 message,
                 htmlAttributes,
@@ -281,8 +409,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public string ValueFor<TResult>([NotNull] Expression<Func<TModel, TResult>> expression, string format)
+        public string ValueFor<TResult>(Expression<Func<TModel, TResult>> expression, string format)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             var modelExplorer = GetModelExplorer(expression);
             return GenerateValue(
                 ExpressionHelper.GetExpressionText(expression),

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/IHtmlGenerator.cs

@@ -6,7 +6,6 @@ using Microsoft.AspNet.Html.Abstractions;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.ModelBinding.Validation;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -24,7 +23,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         string FormatValue(object value, string format);
 
         TagBuilder GenerateActionLink(
-            [NotNull] string linkText,
+            string linkText,
             string actionName,
             string controllerName,
             string protocol,
@@ -38,7 +37,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </summary>
         /// <param name="viewContext">The <see cref="ViewContext"/> instance for the current scope.</param>
         /// <returns>An <see cref="IHtmlContent"/> instance for the &lt;input type="hidden".../&gt; element.</returns>
-        IHtmlContent GenerateAntiforgery([NotNull] ViewContext viewContext);
+        IHtmlContent GenerateAntiforgery(ViewContext viewContext);
 
         /// <summary>
         /// Generate a &lt;input type="checkbox".../&gt; element. 
@@ -55,7 +54,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// A <see cref="TagBuilder"/> instance for the &lt;input type="checkbox".../&gt; element.
         /// </returns>
         TagBuilder GenerateCheckBox(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             bool? isChecked,
@@ -67,7 +66,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// checkbox was present on the page when the request was submitted.
         /// </summary>
         TagBuilder GenerateHiddenForCheckbox(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression);
 
@@ -93,7 +92,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// A <see cref="TagBuilder"/> instance for the &lt;/form&gt; element.
         /// </returns>
         TagBuilder GenerateForm(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             string actionName,
             string controllerName,
             object routeValues,
@@ -121,14 +120,14 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// A <see cref="TagBuilder"/> instance for the &lt;/form&gt; element.
         /// </returns>
         TagBuilder GenerateRouteForm(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             string routeName,
             object routeValues,
             string method,
             object htmlAttributes);
 
         TagBuilder GenerateHidden(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             object value,
@@ -136,21 +135,21 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object htmlAttributes);
 
         TagBuilder GenerateLabel(
-            [NotNull] ViewContext viewContext,
-            [NotNull] ModelExplorer modelExplorer,
+            ViewContext viewContext,
+            ModelExplorer modelExplorer,
             string expression,
             string labelText,
             object htmlAttributes);
 
         TagBuilder GeneratePassword(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             object value,
             object htmlAttributes);
 
         TagBuilder GenerateRadioButton(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             object value,
@@ -158,7 +157,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object htmlAttributes);
 
         TagBuilder GenerateRouteLink(
-            [NotNull] string linkText,
+            string linkText,
             string routeName,
             string protocol,
             string hostName,
@@ -201,7 +200,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </para>
         /// </remarks>
         TagBuilder GenerateSelect(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string optionLabel,
             string expression,
@@ -250,7 +249,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </para>
         /// </remarks>
         TagBuilder GenerateSelect(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string optionLabel,
             string expression,
@@ -260,7 +259,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object htmlAttributes);
 
         TagBuilder GenerateTextArea(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             int rows,
@@ -268,7 +267,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object htmlAttributes);
 
         TagBuilder GenerateTextBox(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             object value,
@@ -276,14 +275,14 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             object htmlAttributes);
 
         TagBuilder GenerateValidationMessage(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             string expression,
             string message,
             string tag,
             object htmlAttributes);
 
         TagBuilder GenerateValidationSummary(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             bool excludePropertyErrors,
             string message,
             string headerTag,
@@ -294,7 +293,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// implementations.
         /// </remarks>
         IEnumerable<ModelClientValidationRule> GetClientValidationRules(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression);
 
@@ -333,7 +332,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// See <see cref="GenerateSelect"/> for information about how the return value may be used.
         /// </remarks>
         IReadOnlyCollection<string> GetCurrentValues(
-            [NotNull] ViewContext viewContext,
+            ViewContext viewContext,
             ModelExplorer modelExplorer,
             string expression,
             bool allowMultiple);

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ITempDataProvider.cs

@@ -3,7 +3,6 @@
 
 using System.Collections.Generic;
 using Microsoft.AspNet.Http;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -17,13 +16,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </summary>
         /// <param name="context">The <see cref="HttpContext"/>.</param>
         /// <returns>The temporary data.</returns>
-        IDictionary<string, object> LoadTempData([NotNull] HttpContext context);
+        IDictionary<string, object> LoadTempData(HttpContext context);
 
         /// <summary>
         /// Saves the temporary data.
         /// </summary>
         /// <param name="context">The <see cref="HttpContext"/>.</param>
         /// <param name="values">The values to save.</param>
-        void SaveTempData([NotNull] HttpContext context, IDictionary<string, object> values);
+        void SaveTempData(HttpContext context, IDictionary<string, object> values);
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/JsonHelper.cs

@@ -1,10 +1,10 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Globalization;
 using System.IO;
 using Newtonsoft.Json;
-using Microsoft.Framework.Internal;
 using Microsoft.AspNet.Mvc.Formatters;
 using Microsoft.AspNet.Mvc.Rendering;
 
@@ -21,8 +21,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// Initializes a new instance of <see cref="JsonHelper"/> that is backed by <paramref name="jsonOutputFormatter"/>.
         /// </summary>
         /// <param name="jsonOutputFormatter">The <see cref="JsonOutputFormatter"/> used to serialize JSON.</param>
-        public JsonHelper([NotNull] JsonOutputFormatter jsonOutputFormatter)
+        public JsonHelper(JsonOutputFormatter jsonOutputFormatter)
         {
+            if (jsonOutputFormatter == null)
+            {
+                throw new ArgumentNullException(nameof(jsonOutputFormatter));
+            }
+
             _jsonOutputFormatter = jsonOutputFormatter;
         }
 
@@ -33,8 +38,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public HtmlString Serialize(object value, [NotNull] JsonSerializerSettings serializerSettings)
+        public HtmlString Serialize(object value, JsonSerializerSettings serializerSettings)
         {
+            if (serializerSettings == null)
+            {
+                throw new ArgumentNullException(nameof(serializerSettings));
+            }
+
             var jsonOutputFormatter = new JsonOutputFormatter(serializerSettings);
 
             return SerializeInternal(jsonOutputFormatter, value);

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ModelExpression.cs

@@ -1,8 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using Microsoft.AspNet.Mvc.ModelBinding;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Rendering
 {
@@ -20,8 +20,18 @@ namespace Microsoft.AspNet.Mvc.Rendering
         /// <param name="modelExplorer">
         /// Includes the model and metadata about the <see cref="System.Linq.Expressions.Expression"/> of interest.
         /// </param>
-        public ModelExpression([NotNull] string name, [NotNull] ModelExplorer modelExplorer)
+        public ModelExpression(string name, ModelExplorer modelExplorer)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
+            if (modelExplorer == null)
+            {
+                throw new ArgumentNullException(nameof(modelExplorer));
+            }
+
             Name = name;
             ModelExplorer = modelExplorer;
         }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/SessionStateTempDataProvider.cs

@@ -52,8 +52,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         };
 
         /// <inheritdoc />
-        public virtual IDictionary<string, object> LoadTempData([NotNull] HttpContext context)
+        public virtual IDictionary<string, object> LoadTempData(HttpContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             if (!IsSessionEnabled(context))
             {
                 // Session middleware is not enabled. No-op
@@ -150,8 +155,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public virtual void SaveTempData([NotNull] HttpContext context, IDictionary<string, object> values)
+        public virtual void SaveTempData(HttpContext context, IDictionary<string, object> values)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var hasValues = (values != null && values.Count > 0);
             if (hasValues)
             {

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/StringCollectionTextWriter.cs

@@ -8,7 +8,6 @@ using System.IO;
 using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
@@ -61,8 +60,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public override void Write([NotNull] char[] buffer, int index, int count)
+        public override void Write(char[] buffer, int index, int count)
         {
+            if (buffer == null)
+            {
+                throw new ArgumentNullException(nameof(buffer));
+            }
+
             if (index < 0)
             {
                 throw new ArgumentOutOfRangeException(nameof(index));
@@ -112,8 +116,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public override Task WriteAsync([NotNull] char[] buffer, int index, int count)
+        public override Task WriteAsync(char[] buffer, int index, int count)
         {
+            if (buffer == null)
+            {
+                throw new ArgumentNullException(nameof(buffer));
+            }
+
             Write(buffer, index, count);
             return _completedTask;
         }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/StringHtmlContent.cs

@@ -1,10 +1,10 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Diagnostics;
 using System.IO;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
@@ -27,8 +27,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         }
 
         /// <inheritdoc />
-        public void WriteTo([NotNull] TextWriter writer, [NotNull] IHtmlEncoder encoder)
+        public void WriteTo(TextWriter writer, IHtmlEncoder encoder)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (encoder == null)
+            {
+                throw new ArgumentNullException(nameof(encoder));
+            }
+
             encoder.HtmlEncode(_input, writer);
         }
 

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/TempDataDictionary.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using Microsoft.AspNet.Http;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -24,8 +23,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </summary>
         /// <param name="context">The <see cref="IHttpContextAccessor"/> that provides the HttpContext.</param>
         /// <param name="provider">The <see cref="ITempDataProvider"/> used to Load and Save data.</param>
-        public TempDataDictionary([NotNull] IHttpContextAccessor context, [NotNull] ITempDataProvider provider)
+        public TempDataDictionary(IHttpContextAccessor context, ITempDataProvider provider)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (provider == null)
+            {
+                throw new ArgumentNullException(nameof(provider));
+            }
+
             _provider = provider;
             _loaded = false;
             _contextAccessor = context;

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/TemplateBuilder.cs

@@ -1,12 +1,12 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Globalization;
 using Microsoft.AspNet.Html.Abstractions;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
 {
@@ -24,15 +24,35 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
         private object _additionalViewData;
 
         public TemplateBuilder(
-            [NotNull] IViewEngine viewEngine,
-            [NotNull] ViewContext viewContext,
-            [NotNull] ViewDataDictionary viewData,
-            [NotNull] ModelExplorer modelExplorer,
+            IViewEngine viewEngine,
+            ViewContext viewContext,
+            ViewDataDictionary viewData,
+            ModelExplorer modelExplorer,
             string htmlFieldName,
             string templateName,
             bool readOnly,
             object additionalViewData)
         {
+            if (viewEngine == null)
+            {
+                throw new ArgumentNullException(nameof(viewEngine));
+            }
+
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
+            if (modelExplorer == null)
+            {
+                throw new ArgumentNullException(nameof(modelExplorer));
+            }
+
             _viewEngine = viewEngine;
             _viewContext = viewContext;
             _viewData = viewData;

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/TemplateRenderer.cs

@@ -12,7 +12,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
 {
@@ -75,12 +74,27 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures.Internal
         private bool _readOnly;
 
         public TemplateRenderer(
-            [NotNull] IViewEngine viewEngine,
-            [NotNull] ViewContext viewContext,
-            [NotNull] ViewDataDictionary viewData,
+            IViewEngine viewEngine,
+            ViewContext viewContext,
+            ViewDataDictionary viewData,
             string templateName,
             bool readOnly)
         {
+            if (viewEngine == null)
+            {
+                throw new ArgumentNullException(nameof(viewEngine));
+            }
+
+            if (viewContext == null)
+            {
+                throw new ArgumentNullException(nameof(viewContext));
+            }
+
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
             _viewEngine = viewEngine;
             _viewContext = viewContext;
             _viewData = viewData;

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/TryGetValueProvider.cs

@@ -20,8 +20,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         private static readonly MethodInfo _strongTryGetValueImplInfo =
             typeof(TryGetValueProvider).GetTypeInfo().GetDeclaredMethod("StrongTryGetValueImpl");
 
-        public static TryGetValueDelegate CreateInstance([NotNull] Type targetType)
+        public static TryGetValueDelegate CreateInstance(Type targetType)
         {
+            if (targetType == null)
+            {
+                throw new ArgumentNullException(nameof(targetType));
+            }
+
             TryGetValueDelegate result;
 
             // Cache delegates since properties of model types are re-evaluated numerous times.

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/UnobtrusiveValidationAttributesGenerator.cs

@@ -5,16 +5,19 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.AspNet.Mvc.ModelBinding.Validation;
-using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
     public static class UnobtrusiveValidationAttributesGenerator
     {
         public static IDictionary<string, object> GetValidationAttributes(
-            [NotNull] IEnumerable<ModelClientValidationRule> clientRules)
+            IEnumerable<ModelClientValidationRule> clientRules)
         {
+            if (clientRules == null)
+            {
+                throw new ArgumentNullException(nameof(clientRules));
+            }
+
             IDictionary<string, object> results = null;
 
             foreach (var rule in clientRules)

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ValidateAntiforgeryTokenAuthorizationFilter.cs

@@ -1,10 +1,10 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Antiforgery;
 using Microsoft.AspNet.Mvc.Filters;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -12,13 +12,23 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
     {
         private readonly IAntiforgery _antiforgery;
 
-        public ValidateAntiforgeryTokenAuthorizationFilter([NotNull] IAntiforgery antiforgery)
+        public ValidateAntiforgeryTokenAuthorizationFilter(IAntiforgery antiforgery)
         {
+            if (antiforgery == null)
+            {
+                throw new ArgumentNullException(nameof(antiforgery));
+            }
+
             _antiforgery = antiforgery;
         }
 
-        public Task OnAuthorizationAsync([NotNull] AuthorizationContext context)
+        public Task OnAuthorizationAsync(AuthorizationContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             return _antiforgery.ValidateRequestAsync(context.HttpContext);
         }
     }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ViewDataDictionary.cs

@@ -29,10 +29,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <param name="modelState"><see cref="ModelStateDictionary"/> instance for this scope.</param>
         /// <remarks>For use when creating a <see cref="ViewDataDictionary"/> for a new top-level scope.</remarks>
         public ViewDataDictionary(
-            [NotNull] IModelMetadataProvider metadataProvider,
-            [NotNull] ModelStateDictionary modelState)
+            IModelMetadataProvider metadataProvider,
+            ModelStateDictionary modelState)
             : this(metadataProvider, modelState, declaredModelType: typeof(object))
         {
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
+            if (modelState == null)
+            {
+                throw new ArgumentNullException(nameof(modelState));
+            }
         }
 
         /// <summary>
@@ -45,9 +53,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <see cref="Type"/> will not change e.g. when copying from a <see cref="ViewDataDictionary{TModel}"/>
         /// instance to a base <see cref="ViewDataDictionary"/> instance.
         /// </remarks>
-        public ViewDataDictionary([NotNull] ViewDataDictionary source)
+        public ViewDataDictionary(ViewDataDictionary source)
             : this(source, source.Model, source._declaredModelType)
         {
+            if (source == null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
         }
 
         /// <summary>
@@ -62,9 +74,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <see cref="Model"/> is known. In this case, <see cref="object"/> is the best possible guess about the
         /// declared type when <paramref name="model"/> is <c>null</c>.
         /// </remarks>
-        public ViewDataDictionary([NotNull] ViewDataDictionary source, object model)
+        public ViewDataDictionary(ViewDataDictionary source, object model)
             : this(source, model, declaredModelType: typeof(object))
         {
+            if (source == null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
         }
 
         /// <summary>
@@ -75,9 +91,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <see cref="ViewDataDictionary.ModelMetadata"/> values.
         /// </param>
         /// <remarks>Internal for testing.</remarks>
-        internal ViewDataDictionary([NotNull] IModelMetadataProvider metadataProvider)
+        internal ViewDataDictionary(IModelMetadataProvider metadataProvider)
             : this(metadataProvider, new ModelStateDictionary())
         {
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
         }
 
         /// <summary>
@@ -95,10 +115,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// For use when creating a derived <see cref="ViewDataDictionary"/> for a new top-level scope.
         /// </remarks>
         protected ViewDataDictionary(
-            [NotNull] IModelMetadataProvider metadataProvider,
-            [NotNull] Type declaredModelType)
+            IModelMetadataProvider metadataProvider,
+            Type declaredModelType)
             : this(metadataProvider, new ModelStateDictionary(), declaredModelType)
         {
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
+            if (declaredModelType == null)
+            {
+                throw new ArgumentNullException(nameof(declaredModelType));
+            }
         }
 
         /// <summary>
@@ -117,15 +145,30 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// For use when creating a derived <see cref="ViewDataDictionary"/> for a new top-level scope.
         /// </remarks>
         protected ViewDataDictionary(
-            [NotNull] IModelMetadataProvider metadataProvider,
-            [NotNull] ModelStateDictionary modelState,
-            [NotNull] Type declaredModelType)
+            IModelMetadataProvider metadataProvider,
+            ModelStateDictionary modelState,
+            Type declaredModelType)
             : this(metadataProvider,
                    modelState,
                    declaredModelType,
                    data: new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase),
                    templateInfo: new TemplateInfo())
         {
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
+
+            if (modelState == null)
+            {
+                throw new ArgumentNullException(nameof(modelState));
+            }
+
+            if (declaredModelType == null)
+            {
+                throw new ArgumentNullException(nameof(declaredModelType));
+            }
+
             // This is the core constructor called when Model is unknown. Base ModelMetadata on the declared type.
             ModelExplorer = _metadataProvider.GetModelExplorerForType(declaredModelType, model: null);
         }
@@ -152,9 +195,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <see cref="ViewDataDictionary(ViewDataDictionary, object, Type)"/> to ignore <c>source.Model</c>.
         /// </para>
         /// </remarks>
-        protected ViewDataDictionary([NotNull] ViewDataDictionary source, Type declaredModelType)
+        protected ViewDataDictionary(ViewDataDictionary source, Type declaredModelType)
             : this(source, model: source.Model, declaredModelType: declaredModelType)
         {
+            if (source == null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
         }
 
         /// <summary>
@@ -178,13 +225,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <paramref name="declaredModelType"/>.
         /// </para>
         /// </remarks>
-        protected ViewDataDictionary([NotNull] ViewDataDictionary source, object model, Type declaredModelType)
+        protected ViewDataDictionary(ViewDataDictionary source, object model, Type declaredModelType)
             : this(source._metadataProvider,
                    new ModelStateDictionary(source.ModelState),
                    declaredModelType,
                    data: new CopyOnWriteDictionary<string, object>(source, StringComparer.OrdinalIgnoreCase),
                    templateInfo: new TemplateInfo(source.TemplateInfo))
         {
+            if (source == null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
+
             // This is the core constructor called when Model is known.
             var modelType = GetModelType(model);
             var metadataModelType = source.ModelMetadata.UnderlyingOrModelType;
@@ -260,7 +312,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         public TemplateInfo TemplateInfo { get; }
 
-#region IDictionary properties
+        #region IDictionary properties
         // Do not just pass through to _data: Indexer should not throw a KeyNotFoundException.
         public object this[string index]
         {
@@ -295,7 +347,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         {
             get { return _data.Values; }
         }
-#endregion
+        #endregion
 
         // for unit testing
         internal IDictionary<string, object> Data
@@ -448,28 +500,48 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             }
         }
 
-#region IDictionary methods
-        public void Add([NotNull] string key, object value)
+        #region IDictionary methods
+        public void Add(string key, object value)
         {
+            if (key == null)
+            {
+                throw new ArgumentNullException(nameof(key));
+            }
+
             _data.Add(key, value);
         }
 
-        public bool ContainsKey([NotNull] string key)
+        public bool ContainsKey(string key)
         {
+            if (key == null)
+            {
+                throw new ArgumentNullException(nameof(key));
+            }
+
             return _data.ContainsKey(key);
         }
 
-        public bool Remove([NotNull] string key)
+        public bool Remove(string key)
         {
+            if (key == null)
+            {
+                throw new ArgumentNullException(nameof(key));
+            }
+
             return _data.Remove(key);
         }
 
-        public bool TryGetValue([NotNull] string key, out object value)
+        public bool TryGetValue(string key, out object value)
         {
+            if (key == null)
+            {
+                throw new ArgumentNullException(nameof(key));
+            }
+
             return _data.TryGetValue(key, out value);
         }
 
-        public void Add([NotNull] KeyValuePair<string, object> item)
+        public void Add(KeyValuePair<string, object> item)
         {
             _data.Add(item);
         }
@@ -479,17 +551,22 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             _data.Clear();
         }
 
-        public bool Contains([NotNull] KeyValuePair<string, object> item)
+        public bool Contains(KeyValuePair<string, object> item)
         {
             return _data.Contains(item);
         }
 
-        public void CopyTo([NotNull] KeyValuePair<string, object>[] array, int arrayIndex)
+        public void CopyTo(KeyValuePair<string, object>[] array, int arrayIndex)
         {
+            if (array == null)
+            {
+                throw new ArgumentNullException(nameof(array));
+            }
+
             _data.CopyTo(array, arrayIndex);
         }
 
-        public bool Remove([NotNull] KeyValuePair<string, object> item)
+        public bool Remove(KeyValuePair<string, object> item)
         {
             return _data.Remove(item);
         }
@@ -503,6 +580,6 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         {
             return _data.GetEnumerator();
         }
-#endregion
+        #endregion
     }
 }

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ViewDataDictionaryOfT.cs

@@ -1,8 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using Microsoft.AspNet.Mvc.ModelBinding;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -17,10 +17,18 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <inheritdoc />
         // References may not show up due to ActivatorUtilities use in RazorPageActivator.
         public ViewDataDictionary(
-            [NotNull] IModelMetadataProvider metadataProvider,
-            [NotNull] ModelStateDictionary modelState)
+            IModelMetadataProvider metadataProvider,
+            ModelStateDictionary modelState)
             : base(metadataProvider, modelState, declaredModelType: typeof(TModel))
         {
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
+            if (modelState == null)
+            {
+                throw new ArgumentNullException(nameof(modelState));
+            }
         }
 
         /// <summary>
@@ -41,9 +49,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </remarks>
         /// <inheritdoc />
         // References may not show up due to ActivatorUtilities use in RazorPageActivator.
-        public ViewDataDictionary([NotNull] ViewDataDictionary source)
+        public ViewDataDictionary(ViewDataDictionary source)
             : base(source, declaredModelType: typeof(TModel))
         {
+            if (source == null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
         }
 
         /// <summary>
@@ -65,9 +77,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         // Model parameter type is object to allow "model: null" calls even when TModel is a value type. A TModel
         // parameter would likely require IEquatable<TModel> type restrictions to pass expected null value to the base
         // constructor.
-        public ViewDataDictionary([NotNull] ViewDataDictionary source, object model)
+        public ViewDataDictionary(ViewDataDictionary source, object model)
             : base(source, model, declaredModelType: typeof(TModel))
         {
+            if (source == null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
         }
 
         /// <summary>
@@ -75,9 +91,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </summary>
         /// <remarks>Internal for testing.</remarks>
         /// <inheritdoc />
-        internal ViewDataDictionary([NotNull] IModelMetadataProvider metadataProvider)
+        internal ViewDataDictionary(IModelMetadataProvider metadataProvider)
             : base(metadataProvider, declaredModelType: typeof(TModel))
         {
+            if (metadataProvider == null)
+            {
+                throw new ArgumentNullException(nameof(metadataProvider));
+            }
         }
 
         public new TModel Model

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ViewDataEvaluator.cs

@@ -1,9 +1,9 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Collections.Generic;
 using System.Reflection;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
 {
@@ -20,8 +20,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <returns>
         /// <see cref="ViewDataInfo"/> for named <paramref name="expression"/> in given <paramref name="viewData"/>.
         /// </returns>
-        public static ViewDataInfo Eval([NotNull] ViewDataDictionary viewData, string expression)
+        public static ViewDataInfo Eval(ViewDataDictionary viewData, string expression)
         {
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
             // While it is not valid to generate a field for the top-level model itself because the result is an
             // unnamed input element, do not throw here if full name is null or empty. Support is needed for cases
             // such as Html.Label() and Html.Value(), where the user's code is not creating a name attribute. Checks

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewFeatures/ViewExecutor.cs

@@ -1,11 +1,11 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
-using Microsoft.Framework.Internal;
 using Microsoft.Net.Http.Headers;
 
 namespace Microsoft.AspNet.Mvc.ViewFeatures
@@ -29,13 +29,38 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <param name="tempData">The <see cref="ITempDataDictionary"/> for the view being rendered.</param>
         /// <returns>A <see cref="Task"/> that represents the asynchronous rendering.</returns>
         public static async Task ExecuteAsync(
-            [NotNull] IView view,
-            [NotNull] ActionContext actionContext,
-            [NotNull] ViewDataDictionary viewData,
-            [NotNull] ITempDataDictionary tempData,
-            [NotNull] HtmlHelperOptions htmlHelperOptions,
+            IView view,
+            ActionContext actionContext,
+            ViewDataDictionary viewData,
+            ITempDataDictionary tempData,
+            HtmlHelperOptions htmlHelperOptions,
             MediaTypeHeaderValue contentType)
         {
+            if (view == null)
+            {
+                throw new ArgumentNullException(nameof(view));
+            }
+
+            if (actionContext == null)
+            {
+                throw new ArgumentNullException(nameof(actionContext));
+            }
+
+            if (viewData == null)
+            {
+                throw new ArgumentNullException(nameof(viewData));
+            }
+
+            if (tempData == null)
+            {
+                throw new ArgumentNullException(nameof(tempData));
+            }
+
+            if (htmlHelperOptions == null)
+            {
+                throw new ArgumentNullException(nameof(htmlHelperOptions));
+            }
+
             var response = actionContext.HttpContext.Response;
 
             if (contentType != null && contentType.Encoding == null)

src/Microsoft.AspNet.Mvc.ViewFeatures/ViewResult.cs

@@ -4,11 +4,9 @@
 using System;
 using System.Diagnostics.Tracing;
 using System.Threading.Tasks;
-using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 using Microsoft.Framework.OptionsModel;
 using Microsoft.Net.Http.Headers;
@@ -56,8 +54,13 @@ namespace Microsoft.AspNet.Mvc
         public MediaTypeHeaderValue ContentType { get; set; }
 
         /// <inheritdoc />
-        public override async Task ExecuteResultAsync([NotNull] ActionContext context)
+        public override async Task ExecuteResultAsync(ActionContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var services = context.HttpContext.RequestServices;
             var viewEngine = ViewEngine ?? services.GetRequiredService<ICompositeViewEngine>();
 
@@ -68,7 +71,7 @@ namespace Microsoft.AspNet.Mvc
 
             var viewName = ViewName ?? context.ActionDescriptor.Name;
             var viewEngineResult = viewEngine.FindView(context, viewName);
-            if(!viewEngineResult.Success)
+            if (!viewEngineResult.Success)
             {
                 if (telemetry.IsEnabled("Microsoft.AspNet.Mvc.ViewResultViewNotFound"))
                 {
@@ -84,7 +87,7 @@ namespace Microsoft.AspNet.Mvc
                 }
 
                 logger.LogError(
-                    "The view '{ViewName}' was not found. Searched locations: {SearchedViewLocations}", 
+                    "The view '{ViewName}' was not found. Searched locations: {SearchedViewLocations}",
                     viewName,
                     viewEngineResult.SearchedLocations);
             }

src/Microsoft.AspNet.Mvc.ViewFeatures/project.json

@@ -18,21 +18,12 @@
         "Microsoft.Framework.BufferedHtmlContent.Sources": { "version": "1.0.0-*", "type": "build" },
         "Microsoft.Framework.ClosedGenericMatcher.Sources": { "version": "1.0.0-*", "type": "build" },
         "Microsoft.Framework.CopyOnWriteDictionary.Sources": { "version": "1.0.0-*", "type": "build" },
-        "Microsoft.Framework.NotNullAttribute.Sources": { "version": "1.0.0-*", "type": "build" },
         "Microsoft.Framework.PropertyActivator.Sources": { "version": "1.0.0-*", "type": "build" },
         "Microsoft.Framework.PropertyHelper.Sources": { "version": "1.0.0-*", "type": "build" }
     },
 
     "frameworks": {
-        "dnx451": {
-            "frameworkAssemblies": {
-                "System.ComponentModel.DataAnnotations": ""
-            }
-        },
-        "dnxcore50": {
-            "dependencies": {
-                "System.ComponentModel.Annotations": "4.0.11-beta-*"
-            }
-        }
+        "dnx451": { },
+        "dnxcore50": { }
     }
 }

test/Microsoft.AspNet.Mvc.Razor.Test/RazorPageTest.cs

@@ -8,12 +8,15 @@ using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Html.Abstractions;
 using Microsoft.AspNet.Http.Internal;
+using Microsoft.AspNet.Mvc.Abstractions;
+using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TestCommon;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.PageExecutionInstrumentation;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
+using Microsoft.AspNet.Routing;
 using Microsoft.AspNet.Testing;
 using Microsoft.Framework.WebEncoders.Testing;
 using Moq;
@@ -1827,11 +1830,14 @@ namespace Microsoft.AspNet.Mvc.Razor
         private static ViewContext CreateViewContext(TextWriter writer = null)
         {
             writer = writer ?? new StringWriter();
-            var actionContext = new ActionContext(new DefaultHttpContext(), routeData: null, actionDescriptor: null);
+            var actionContext = new ActionContext(
+                new DefaultHttpContext(),
+                new RouteData(),
+                new ActionDescriptor());
             return new ViewContext(
                 actionContext,
                 Mock.Of<IView>(),
-                null,
+                new ViewDataDictionary(new EmptyModelMetadataProvider()),
                 Mock.Of<ITempDataDictionary>(),
                 writer,
                 new HtmlHelperOptions());

test/Microsoft.AspNet.Mvc.Razor.Test/RazorViewEngineTest.cs

@@ -297,14 +297,18 @@ namespace Microsoft.AspNet.Mvc.Razor.Test
             var pageFactory = new Mock<IRazorPageFactory>();
             var viewFactory = new Mock<IRazorViewFactory>();
             var page = Mock.Of<IRazorPage>();
-            pageFactory.Setup(p => p.CreateInstance("fake-path1/bar/test-view.rzr"))
-                       .Returns(Mock.Of<IRazorPage>())
-                       .Verifiable();
-            var viewEngine = new OverloadedLocationViewEngine(pageFactory.Object,
-                                                              viewFactory.Object,
-                                                              GetOptionsAccessor(),
-                                                              GetViewLocationCache());
+            pageFactory
+                .Setup(p => p.CreateInstance("fake-path1/bar/test-view.rzr"))
+                .Returns(page)
+                .Verifiable();
+            var viewEngine = new OverloadedLocationViewEngine(
+                pageFactory.Object,
+                viewFactory.Object,
+                GetOptionsAccessor(),
+                GetViewLocationCache());
             var context = GetActionContext(_controllerTestContext);
+            viewFactory.Setup(v => v.GetView(viewEngine, page, false))
+                .Returns(Mock.Of<IView>());
 
             // Act
             var result = viewEngine.FindView(context, "test-view");
@@ -320,14 +324,18 @@ namespace Microsoft.AspNet.Mvc.Razor.Test
             var pageFactory = new Mock<IRazorPageFactory>();
             var viewFactory = new Mock<IRazorViewFactory>();
             var page = Mock.Of<IRazorPage>();
-            pageFactory.Setup(p => p.CreateInstance("fake-area-path/foo/bar/test-view2.rzr"))
-                       .Returns(Mock.Of<IRazorPage>())
-                       .Verifiable();
-            var viewEngine = new OverloadedLocationViewEngine(pageFactory.Object,
-                                                              viewFactory.Object,
-                                                              GetOptionsAccessor(),
-                                                              GetViewLocationCache());
+            pageFactory
+                .Setup(p => p.CreateInstance("fake-area-path/foo/bar/test-view2.rzr"))
+                .Returns(page)
+                .Verifiable();
+            var viewEngine = new OverloadedLocationViewEngine(
+                pageFactory.Object,
+                viewFactory.Object,
+                GetOptionsAccessor(),
+                GetViewLocationCache());
             var context = GetActionContext(_areaTestContext);
+            viewFactory.Setup(v => v.GetView(viewEngine, page, false))
+                .Returns(Mock.Of<IView>());
 
             // Act
             var result = viewEngine.FindView(context, "test-view2");

test/Microsoft.AspNet.Mvc.Razor.Test/RazorViewTest.cs

@@ -8,10 +8,12 @@ using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Http.Features;
 using Microsoft.AspNet.Http.Internal;
+using Microsoft.AspNet.Mvc.Abstractions;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.PageExecutionInstrumentation;
+using Microsoft.AspNet.Routing;
 using Microsoft.Framework.WebEncoders.Testing;
 using Moq;
 using Xunit;
@@ -1404,12 +1406,13 @@ namespace Microsoft.AspNet.Mvc.Razor
             viewEngine.Setup(p => p.FindPage(It.IsAny<ActionContext>(), "/Layout.cshtml"))
                        .Returns(new RazorPageResult("Layout", layout));
 
-            var view = new RazorView(viewEngine.Object,
-                                     Mock.Of<IRazorPageActivator>(),
-                                     CreateViewStartProvider(viewStart),
-                                     page,
-                                     new CommonTestEncoder(),
-                                     isPartial: false);
+            var view = new RazorView(
+                viewEngine.Object,
+                Mock.Of<IRazorPageActivator>(),
+                CreateViewStartProvider(viewStart),
+                page,
+                new CommonTestEncoder(),
+                isPartial: false);
             var viewContext = CreateViewContext(view);
 
             // Act
@@ -1457,7 +1460,7 @@ namespace Microsoft.AspNet.Mvc.Razor
         private static ViewContext CreateViewContext(RazorView view)
         {
             var httpContext = new DefaultHttpContext();
-            var actionContext = new ActionContext(httpContext, routeData: null, actionDescriptor: null);
+            var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());
             return new ViewContext(
                 actionContext,
                 view,
@@ -1471,8 +1474,9 @@ namespace Microsoft.AspNet.Mvc.Razor
         {
             viewStartPages = viewStartPages ?? new IRazorPage[0];
             var viewStartProvider = new Mock<IViewStartProvider>();
-            viewStartProvider.Setup(v => v.GetViewStartPages(It.IsAny<string>()))
-                             .Returns(viewStartPages);
+            viewStartProvider
+                .Setup(v => v.GetViewStartPages(It.IsAny<string>()))
+                .Returns(viewStartPages);
 
             return viewStartProvider.Object;
         }

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ControllerTest.cs

@@ -13,6 +13,7 @@ using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Http.Internal;
 using Microsoft.AspNet.Mvc.Abstractions;
 using Microsoft.AspNet.Mvc.Filters;
+using Microsoft.AspNet.Mvc.Formatters;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.ModelBinding.Validation;
 using Microsoft.AspNet.Mvc.ViewFeatures;
@@ -1753,6 +1754,7 @@ namespace Microsoft.AspNet.Mvc.Test
             {
                 ModelBinder = binder,
                 ValueProvider = provider,
+                InputFormatters = new List<IInputFormatter>(),
                 ValidatorProvider = new DataAnnotationsModelValidatorProvider(
                     options: null,
                     stringLocalizerFactory: null)

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/PartialViewResultTest.cs

@@ -7,7 +7,9 @@ using System.Threading.Tasks;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Http.Internal;
 using Microsoft.AspNet.Mvc.Abstractions;
+using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.ViewEngines;
+using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Routing;
 using Microsoft.Framework.Logging;
 using Microsoft.Framework.OptionsModel;
@@ -23,27 +25,32 @@ namespace Microsoft.AspNet.Mvc
         public async Task ExecuteResultAsync_ReturnsError_IfViewCouldNotBeFound()
         {
             // Arrange
-            var expected = string.Join(Environment.NewLine,
-                                       "The view 'MyView' was not found. The following locations were searched:",
-                                       "Location1",
-                                       "Location2.");
-            var actionContext = new ActionContext(GetHttpContext(),
-                                                  new RouteData(),
-                                                  new ActionDescriptor());
+            var expected = string.Join(
+                Environment.NewLine,
+                "The view 'MyView' was not found. The following locations were searched:",
+                "Location1",
+                "Location2.");
+            var actionContext = new ActionContext(
+                GetHttpContext(),
+                new RouteData(),
+                new ActionDescriptor());
             var viewEngine = new Mock<IViewEngine>();
-            viewEngine.Setup(v => v.FindPartialView(It.IsAny<ActionContext>(), It.IsAny<string>()))
-                      .Returns(ViewEngineResult.NotFound("MyView", new[] { "Location1", "Location2" }))
-                       .Verifiable();
+            viewEngine
+                .Setup(v => v.FindPartialView(It.IsAny<ActionContext>(), It.IsAny<string>()))
+                .Returns(ViewEngineResult.NotFound("MyView", new[] { "Location1", "Location2" }))
+                .Verifiable();
 
             var viewResult = new PartialViewResult
             {
                 ViewEngine = viewEngine.Object,
-                ViewName = "MyView"
+                ViewName = "MyView",
+                ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
+                TempData = Mock.Of<ITempDataDictionary>(),
             };
 
             // Act and Assert
             var ex = await Assert.ThrowsAsync<InvalidOperationException>(
-                                () => viewResult.ExecuteResultAsync(actionContext));
+                () => viewResult.ExecuteResultAsync(actionContext));
             Assert.Equal(expected, ex.Message);
             viewEngine.Verify();
         }
@@ -57,14 +64,17 @@ namespace Microsoft.AspNet.Mvc
             var viewEngine = new Mock<IViewEngine>();
             var view = Mock.Of<IView>();
 
-            viewEngine.Setup(e => e.FindPartialView(context, "myview"))
-                      .Returns(ViewEngineResult.Found("myview", view))
-                      .Verifiable();
+            viewEngine
+                .Setup(e => e.FindPartialView(context, "myview"))
+                .Returns(ViewEngineResult.Found("myview", view))
+                .Verifiable();
 
             var viewResult = new PartialViewResult
             {
                 ViewName = viewName,
-                ViewEngine = viewEngine.Object
+                ViewEngine = viewEngine.Object,
+                ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
+                TempData = Mock.Of<ITempDataDictionary>(),
             };
 
             // Act
@@ -109,14 +119,17 @@ namespace Microsoft.AspNet.Mvc
             var viewEngine = new Mock<IViewEngine>();
             var view = Mock.Of<IView>();
 
-            viewEngine.Setup(e => e.FindPartialView(context, "myview"))
-                      .Returns(ViewEngineResult.Found("myview", view));
+            viewEngine
+                .Setup(e => e.FindPartialView(context, "myview"))
+                .Returns(ViewEngineResult.Found("myview", view));
 
             var viewResult = new PartialViewResult
             {
                 ViewName = viewName,
                 ViewEngine = viewEngine.Object,
-                ContentType = contentType
+                ContentType = contentType,
+                ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
+                TempData = Mock.Of<ITempDataDictionary>(),
             };
 
             // Act
@@ -136,14 +149,17 @@ namespace Microsoft.AspNet.Mvc
             var viewEngine = new Mock<IViewEngine>();
             var view = Mock.Of<IView>();
 
-            viewEngine.Setup(e => e.FindPartialView(context, "myview"))
-                      .Returns(ViewEngineResult.Found("myview", view));
+            viewEngine
+                .Setup(e => e.FindPartialView(context, "myview"))
+                .Returns(ViewEngineResult.Found("myview", view));
 
             var viewResult = new PartialViewResult
             {
                 ViewName = viewName,
                 ViewEngine = viewEngine.Object,
                 StatusCode = 404,
+                ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
+                TempData = Mock.Of<ITempDataDictionary>(),
             };
 
             // Act
@@ -158,17 +174,21 @@ namespace Microsoft.AspNet.Mvc
         {
             // Arrange
             var viewName = "some-view-name";
-            var context = new ActionContext(GetHttpContext(),
-                                            new RouteData(),
-                                            new ActionDescriptor { Name = viewName });
+            var context = new ActionContext(
+                GetHttpContext(),
+                new RouteData(),
+                new ActionDescriptor { Name = viewName });
             var viewEngine = new Mock<ICompositeViewEngine>();
-            viewEngine.Setup(e => e.FindPartialView(context, viewName))
-                      .Returns(ViewEngineResult.Found(viewName, Mock.Of<IView>()))
-                      .Verifiable();
+            viewEngine
+                .Setup(e => e.FindPartialView(context, viewName))
+                .Returns(ViewEngineResult.Found(viewName, Mock.Of<IView>()))
+                .Verifiable();
 
             var viewResult = new PartialViewResult
             {
-                ViewEngine = viewEngine.Object
+                ViewEngine = viewEngine.Object,
+                ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
+                TempData = Mock.Of<ITempDataDictionary>(),
             };
 
             // Act
@@ -183,19 +203,23 @@ namespace Microsoft.AspNet.Mvc
         {
             // Arrange
             var viewName = "partial-view-name";
-            var context = new ActionContext(new DefaultHttpContext(),
-                                            new RouteData(),
-                                            new ActionDescriptor { Name = viewName });
+            var context = new ActionContext(
+                new DefaultHttpContext(),
+                new RouteData(),
+                new ActionDescriptor { Name = viewName });
             var viewEngine = new Mock<ICompositeViewEngine>();
-            viewEngine.Setup(e => e.FindPartialView(It.IsAny<ActionContext>(), viewName))
-                      .Returns(ViewEngineResult.Found(viewName, Mock.Of<IView>()))
-                      .Verifiable();
+            viewEngine
+                .Setup(e => e.FindPartialView(It.IsAny<ActionContext>(), viewName))
+                .Returns(ViewEngineResult.Found(viewName, Mock.Of<IView>()))
+                .Verifiable();
 
             var serviceProvider = new Mock<IServiceProvider>();
-            serviceProvider.Setup(p => p.GetService(typeof(ICompositeViewEngine)))
-                           .Returns(viewEngine.Object);
-            serviceProvider.Setup(p => p.GetService(typeof(ILogger<PartialViewResult>)))
-                           .Returns(new Mock<ILogger<PartialViewResult>>().Object);
+            serviceProvider
+                .Setup(p => p.GetService(typeof(ICompositeViewEngine)))
+                .Returns(viewEngine.Object);
+            serviceProvider
+                .Setup(p => p.GetService(typeof(ILogger<PartialViewResult>)))
+                .Returns(new Mock<ILogger<PartialViewResult>>().Object);
             serviceProvider.Setup(s => s.GetService(typeof(IOptions<MvcViewOptions>)))
                 .Returns(() => {
                     var optionsAccessor = new Mock<IOptions<MvcViewOptions>>();
@@ -207,7 +231,9 @@ namespace Microsoft.AspNet.Mvc
 
             var viewResult = new PartialViewResult
             {
-                ViewName = viewName
+                ViewName = viewName,
+                ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
+                TempData = Mock.Of<ITempDataDictionary>(),
             };
 
             // Act

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/Rendering/DefaultTemplatesUtilities.cs

@@ -285,7 +285,9 @@ namespace Microsoft.AspNet.Mvc.Rendering
                 actionContext,
                 Mock.Of<IView>(),
                 viewData,
-                null,
+                new TempDataDictionary(
+                    new HttpContextAccessor(),
+                    Mock.Of<ITempDataProvider>()),
                 new StringWriter(),
                 options.HtmlHelperOptions);
 

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/Rendering/HtmlHelperSelectTest.cs

@@ -10,7 +10,6 @@ using Microsoft.AspNet.Mvc.TestCommon;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Testing;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 using Moq;
 using Xunit;
@@ -1563,7 +1562,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
 
         private class TestHtmlHelper : HtmlHelper
         {
-            public TestHtmlHelper([NotNull] IModelMetadataProvider metadataProvider)
+            public TestHtmlHelper(IModelMetadataProvider metadataProvider)
                 : base(
                       new Mock<IHtmlGenerator>(MockBehavior.Strict).Object,
                       new Mock<ICompositeViewEngine>(MockBehavior.Strict).Object,
@@ -1580,7 +1579,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
 
             public IEnumerable<SelectListItem> CopiedSelectListItems { get; private set; }
 
-            protected override IEnumerable<SelectListItem> GetEnumSelectList([NotNull] ModelMetadata metadata)
+            protected override IEnumerable<SelectListItem> GetEnumSelectList(ModelMetadata metadata)
             {
                 Metadata = metadata;
                 SelectListItems = base.GetEnumSelectList(metadata);

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/Rendering/ViewContextTests.cs

@@ -1,8 +1,14 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.IO;
+using Microsoft.AspNet.Http.Internal;
+using Microsoft.AspNet.Mvc.Abstractions;
 using Microsoft.AspNet.Mvc.ModelBinding;
+using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
+using Microsoft.AspNet.Routing;
+using Moq;
 using Xunit;
 
 namespace Microsoft.AspNet.Mvc.Rendering
@@ -12,15 +18,15 @@ namespace Microsoft.AspNet.Mvc.Rendering
         [Fact]
         public void SettingViewData_AlsoUpdatesViewBag()
         {
-            // Arrange (eventually passing null to these consturctors will throw)
+            // Arrange
+            var originalViewData = new ViewDataDictionary(metadataProvider: new EmptyModelMetadataProvider());
             var context = new ViewContext(
-                new ActionContext(null, null, null),
-                view: null,
-                viewData: null,
-                tempData: null,
-                writer: null,
+                new ActionContext(new DefaultHttpContext(), new RouteData(), new ActionDescriptor()),
+                view: Mock.Of<IView>(),
+                viewData: originalViewData,
+                tempData: new TempDataDictionary(new HttpContextAccessor(), Mock.Of<ITempDataProvider>()),
+                writer: TextWriter.Null,
                 htmlHelperOptions: new HtmlHelperOptions());
-            var originalViewData = context.ViewData = new ViewDataDictionary(metadataProvider: new EmptyModelMetadataProvider());
             var replacementViewData = new ViewDataDictionary(metadataProvider: new EmptyModelMetadataProvider());
 
             // Act

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ViewComponentResultTest.cs

@@ -13,28 +13,34 @@ using Microsoft.AspNet.Mvc.Infrastructure;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewComponents;
+using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Routing;
 using Microsoft.Framework.DependencyInjection;
 using Microsoft.Framework.OptionsModel;
 using Microsoft.Net.Http.Headers;
-using Moq;
 using Xunit;
 
 namespace Microsoft.AspNet.Mvc
 {
     public class ViewComponentResultTest
     {
+        private readonly ITempDataDictionary _tempDataDictionary =
+            new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider());
+
         [Fact]
         public async Task ExecuteResultAsync_Throws_IfNameOrTypeIsNotSet()
         {
             // Arrange
-            var expected = 
+            var expected =
                 "Either the 'ViewComponentName' or 'ViewComponentType' " +
                 "property must be set in order to invoke a view component.";
 
             var actionContext = CreateActionContext();
 
-            var viewComponentResult = new ViewComponentResult();
+            var viewComponentResult = new ViewComponentResult
+            {
+                TempData = _tempDataDictionary,
+            };
 
             // Act and Assert
             var exception = await Assert.ThrowsAsync<InvalidOperationException>(
@@ -53,6 +59,7 @@ namespace Microsoft.AspNet.Mvc
             var viewComponentResult = new ViewComponentResult
             {
                 ViewComponentName = "Text",
+                TempData = _tempDataDictionary,
             };
 
             // Act and Assert
@@ -75,6 +82,7 @@ namespace Microsoft.AspNet.Mvc
             var viewComponentResult = new ViewComponentResult
             {
                 ViewComponentType = typeof(TextViewComponent),
+                TempData = _tempDataDictionary,
             };
 
             // Act and Assert
@@ -100,6 +108,7 @@ namespace Microsoft.AspNet.Mvc
             {
                 Arguments = new object[] { "World!" },
                 ViewComponentName = "Text",
+                TempData = _tempDataDictionary,
             };
 
             // Act
@@ -127,6 +136,7 @@ namespace Microsoft.AspNet.Mvc
             {
                 Arguments = new object[] { "World!" },
                 ViewComponentName = "AsyncText",
+                TempData = _tempDataDictionary,
             };
 
             // Act
@@ -154,6 +164,7 @@ namespace Microsoft.AspNet.Mvc
             {
                 Arguments = new object[] { "World!" },
                 ViewComponentName = "Text",
+                TempData = _tempDataDictionary,
             };
 
             // Act
@@ -181,6 +192,7 @@ namespace Microsoft.AspNet.Mvc
             {
                 Arguments = new object[] { "World!" },
                 ViewComponentName = "Full.Name.Text",
+                TempData = _tempDataDictionary,
             };
 
             // Act
@@ -208,6 +220,7 @@ namespace Microsoft.AspNet.Mvc
             {
                 Arguments = new object[] { "World!" },
                 ViewComponentType = typeof(TextViewComponent),
+                TempData = _tempDataDictionary,
             };
 
             // Act
@@ -236,6 +249,7 @@ namespace Microsoft.AspNet.Mvc
                 Arguments = new object[] { "World!" },
                 ViewComponentType = typeof(TextViewComponent),
                 StatusCode = 404,
+                TempData = _tempDataDictionary,
             };
 
             // Act
@@ -293,7 +307,8 @@ namespace Microsoft.AspNet.Mvc
             {
                 Arguments = new object[] { "World!" },
                 ViewComponentName = "Text",
-                ContentType = contentType
+                ContentType = contentType,
+                TempData = _tempDataDictionary,
             };
 
             // Act
@@ -330,6 +345,7 @@ namespace Microsoft.AspNet.Mvc
                 Arguments = new object[] { "World!" },
                 ViewComponentName = "Text",
                 ContentType = new MediaTypeHeaderValue("text/html") { Encoding = Encoding.UTF8 },
+                TempData = _tempDataDictionary,
             };
 
             // Act
@@ -359,6 +375,7 @@ namespace Microsoft.AspNet.Mvc
             {
                 Arguments = new object[] { "World!" },
                 ViewComponentName = "Text",
+                TempData = _tempDataDictionary,
             };
 
             // Act

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ViewComponents/ContentViewComponentResultTest.cs

@@ -60,7 +60,8 @@ namespace Microsoft.AspNet.Mvc
             var viewContext = new ViewContext(
                 actionContext,
                 view,
-                viewData, null,
+                viewData, 
+                new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider()),
                 TextWriter.Null,
                 new HtmlHelperOptions());
 

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ViewComponents/DefaultViewComponentSelectorTest.cs

@@ -6,7 +6,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
 using Microsoft.AspNet.Mvc.Infrastructure;
-using Microsoft.Framework.Internal;
 using Xunit;
 
 namespace Microsoft.AspNet.Mvc.ViewComponents
@@ -187,7 +186,7 @@ namespace Microsoft.AspNet.Mvc.ViewComponents
 
             public Type[] AllowedTypes { get; private set; }
 
-            protected override bool IsViewComponentType([NotNull] TypeInfo typeInfo)
+            protected override bool IsViewComponentType(TypeInfo typeInfo)
             {
                 return AllowedTypes.Contains(typeInfo.AsType());
             }

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ViewComponents/JsonViewComponentResultTest.cs

@@ -71,7 +71,7 @@ namespace Microsoft.AspNet.Mvc
                 actionContext,
                 view,
                 viewData,
-                null,
+                Mock.Of<ITempDataDictionary>(),
                 TextWriter.Null,
                 new HtmlHelperOptions());
 

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ViewComponents/ViewViewComponentResultTest.cs

@@ -20,6 +20,9 @@ namespace Microsoft.AspNet.Mvc
 {
     public class ViewViewComponentResultTest
     {
+        private readonly ITempDataDictionary _tempDataDictionary =
+            new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider());
+
         [Fact]
         public void Execute_RendersPartialViews()
         {
@@ -40,7 +43,8 @@ namespace Microsoft.AspNet.Mvc
             {
                 ViewEngine = viewEngine.Object,
                 ViewName = "some-view",
-                ViewData = viewData
+                ViewData = viewData,
+                TempData = _tempDataDictionary,
             };
 
             var viewComponentContext = GetViewComponentContext(view.Object, viewData);
@@ -72,7 +76,8 @@ namespace Microsoft.AspNet.Mvc
             var result = new ViewViewComponentResult
             {
                 ViewEngine = viewEngine.Object,
-                ViewData = viewData
+                ViewData = viewData,
+                TempData = _tempDataDictionary,
             };
 
             var viewComponentContext = GetViewComponentContext(view.Object, viewData);
@@ -107,7 +112,8 @@ namespace Microsoft.AspNet.Mvc
             {
                 ViewEngine = viewEngine.Object,
                 ViewName = "some-view",
-                ViewData = viewData
+                ViewData = viewData,
+                TempData = _tempDataDictionary,
             };
 
             var viewComponentContext = GetViewComponentContext(view, viewData);
@@ -139,7 +145,8 @@ namespace Microsoft.AspNet.Mvc
             {
                 ViewEngine = viewEngine.Object,
                 ViewName = "some-view",
-                ViewData = viewData
+                ViewData = viewData,
+                TempData = _tempDataDictionary,
             };
 
             var viewComponentContext = GetViewComponentContext(view.Object, viewData);
@@ -169,7 +176,8 @@ namespace Microsoft.AspNet.Mvc
             {
                 ViewEngine = viewEngine.Object,
                 ViewName = "some-view",
-                ViewData = viewData
+                ViewData = viewData,
+                TempData = _tempDataDictionary,
             };
 
             var viewComponentContext = GetViewComponentContext(view, viewData);
@@ -201,7 +209,8 @@ namespace Microsoft.AspNet.Mvc
             var result = new ViewViewComponentResult
             {
                 ViewName = "some-view",
-                ViewData = viewData
+                ViewData = viewData,
+                TempData = _tempDataDictionary,
             };
 
             var viewComponentContext = GetViewComponentContext(view, viewData);
@@ -239,7 +248,8 @@ namespace Microsoft.AspNet.Mvc
             {
                 ViewEngine = viewEngine.Object,
                 ViewName = "some-view",
-                ViewData = viewData
+                ViewData = viewData,
+                TempData = _tempDataDictionary,
             };
 
             var viewComponentContext = GetViewComponentContext(view, viewData);
@@ -266,7 +276,8 @@ namespace Microsoft.AspNet.Mvc
             var result = new ViewViewComponentResult
             {
                 ViewName = "some-view",
-                ViewData = viewData
+                ViewData = viewData,
+                TempData = _tempDataDictionary,
             };
 
             var viewComponentContext = GetViewComponentContext(view, viewData);
@@ -299,6 +310,7 @@ namespace Microsoft.AspNet.Mvc
             componentResult.ViewEngine = viewEngine.Object;
             componentResult.ViewData = viewData;
             componentResult.ViewName = viewName;
+            componentResult.TempData = _tempDataDictionary;
 
             // Act & Assert
             componentResult.Execute(componentContext);
@@ -323,7 +335,8 @@ namespace Microsoft.AspNet.Mvc
             {
                 ViewEngine = viewEngine.Object,
                 ViewData = viewData,
-                ViewName = viewName
+                ViewName = viewName,
+                TempData = _tempDataDictionary,
             };
 
             // Act & Assert
@@ -338,7 +351,7 @@ namespace Microsoft.AspNet.Mvc
                 actionContext,
                 view,
                 viewData,
-                null,
+                new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider()),
                 TextWriter.Null,
                 new HtmlHelperOptions());
 

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ViewFeatures/DefaultEditorTemplatesTest.cs

@@ -17,7 +17,6 @@ using Microsoft.AspNet.Mvc.TestCommon;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures.Internal;
 using Microsoft.AspNet.Testing;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 using Moq;
 using Xunit;
@@ -426,7 +425,7 @@ Environment.NewLine;
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(
                 model,
-                null,
+                Mock.Of<IUrlHelper>(),
                 viewEngine.Object,
                 provider,
                 innerHelper => new StubbyHtmlHelper(innerHelper));
@@ -465,7 +464,7 @@ Environment.NewLine;
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(
                 model,
-                null,
+                Mock.Of<IUrlHelper>(),
                 viewEngine.Object,
                 provider,
                 innerHelper => new StubbyHtmlHelper(innerHelper));
@@ -503,7 +502,7 @@ Environment.NewLine;
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(
                 model,
-                null,
+                Mock.Of<IUrlHelper>(),
                 viewEngine.Object,
                 provider,
                 innerHelper => new StubbyHtmlHelper(innerHelper));
@@ -542,7 +541,7 @@ Environment.NewLine;
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(
                 model,
-                null,
+                Mock.Of<IUrlHelper>(),
                 viewEngine.Object,
                 provider,
                 innerHelper => new StubbyHtmlHelper(innerHelper));
@@ -624,7 +623,7 @@ Environment.NewLine;
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(
                 model,
-                null,
+                Mock.Of<IUrlHelper>(),
                 viewEngine.Object,
                 provider);
             helper.ViewData.TemplateInfo.HtmlFieldPrefix = "FieldPrefix";
@@ -678,7 +677,7 @@ Environment.NewLine;
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(
                 model,
-                null,
+                Mock.Of<IUrlHelper>(),
                 viewEngine.Object,
                 provider);
             helper.Html5DateRenderingMode = Html5DateRenderingMode.Rfc3339;
@@ -737,7 +736,7 @@ Environment.NewLine;
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(
                 model,
-                null,
+                Mock.Of<IUrlHelper>(),
                 viewEngine.Object,
                 provider);
 
@@ -929,13 +928,13 @@ Environment.NewLine;
                 get { return _innerHelper.JavaScriptStringEncoder; }
             }
 
-            public void Contextualize([NotNull] ViewContext viewContext)
+            public void Contextualize(ViewContext viewContext)
             {
                 (_innerHelper as ICanHasViewContext)?.Contextualize(viewContext);
             }
 
             public IHtmlContent ActionLink(
-                [NotNull] string linkText,
+                string linkText,
                 string actionName,
                 string controllerName,
                 string protocol,
@@ -1033,7 +1032,7 @@ Environment.NewLine;
                 throw new NotImplementedException();
             }
 
-            public string GenerateIdFromName([NotNull] string name)
+            public string GenerateIdFromName(string name)
             {
                 throw new NotImplementedException();
             }
@@ -1050,7 +1049,7 @@ Environment.NewLine;
                 throw new NotImplementedException();
             }
 
-            public IEnumerable<SelectListItem> GetEnumSelectList([NotNull] Type enumType)
+            public IEnumerable<SelectListItem> GetEnumSelectList(Type enumType)
             {
                 throw new NotImplementedException();
             }
@@ -1081,7 +1080,7 @@ Environment.NewLine;
             }
 
             public Task<IHtmlContent> PartialAsync(
-                [NotNull] string partialViewName,
+                string partialViewName,
                 object model,
                 ViewDataDictionary viewData)
             {
@@ -1108,13 +1107,13 @@ Environment.NewLine;
                 throw new NotImplementedException();
             }
 
-            public Task RenderPartialAsync([NotNull] string partialViewName, object model, ViewDataDictionary viewData)
+            public Task RenderPartialAsync(string partialViewName, object model, ViewDataDictionary viewData)
             {
                 throw new NotImplementedException();
             }
 
             public IHtmlContent RouteLink(
-                [NotNull] string linkText,
+                string linkText,
                 string routeName,
                 string protocol,
                 string hostName,

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ViewFeatures/DefaultHtmlGeneratorTest.cs

@@ -6,10 +6,13 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using Microsoft.AspNet.Antiforgery;
+using Microsoft.AspNet.Http.Internal;
+using Microsoft.AspNet.Mvc.Abstractions;
 using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.Routing;
 using Microsoft.AspNet.Mvc.ViewEngines;
+using Microsoft.AspNet.Routing;
 using Microsoft.Framework.OptionsModel;
 using Microsoft.Framework.WebEncoders;
 using Moq;
@@ -661,7 +664,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         // GetCurrentValues uses only the ModelStateDictionary and ViewDataDictionary from the passed ViewContext.
         private static ViewContext GetViewContext<TModel>(TModel model, IModelMetadataProvider metadataProvider)
         {
-            var actionContext = new ActionContext();
+            var actionContext = new ActionContext(new DefaultHttpContext(), new RouteData(), new ActionDescriptor());
             var viewData = new ViewDataDictionary<TModel>(metadataProvider, actionContext.ModelState)
             {
                 Model = model,