Replace NotNullAttribute with thrown exceptions

src/Microsoft.AspNet.Mvc.Razor.Host/Directives/ChunkHelper.cs

@@ -5,7 +5,6 @@ using System;
 using System.Linq;
 using Microsoft.AspNet.Mvc.Razor.Host;
 using Microsoft.AspNet.Razor.Chunks;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Directives
 {
@@ -25,9 +24,14 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// <returns>The <paramref name="chunk"/> cast to <typeparamref name="TChunk"/>.</returns>
         /// <exception cref="ArgumentException"><paramref name="chunk"/> is not an instance of
         /// <typeparamref name="TChunk"/>.</exception>
-        public static TChunk EnsureChunk<TChunk>([NotNull] Chunk chunk)
+        public static TChunk EnsureChunk<TChunk>(Chunk chunk)
             where TChunk : Chunk
         {
+            if (chunk == null)
+            {
+                throw new ArgumentNullException(nameof(chunk));
+            }
+
             var chunkOfT = chunk as TChunk;
             if (chunkOfT == null)
             {
@@ -45,8 +49,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// <param name="chunkTree">The <see cref="ChunkTree"/> to scan for <see cref="ModelChunk"/>s in.</param>
         /// <returns>The last <see cref="ModelChunk"/> in the <see cref="ChunkTree"/> if found, <c>null</c> otherwise.
         /// </returns>
-        public static ModelChunk GetModelChunk([NotNull] ChunkTree chunkTree)
+        public static ModelChunk GetModelChunk(ChunkTree chunkTree)
         {
+            if (chunkTree == null)
+            {
+                throw new ArgumentNullException(nameof(chunkTree));
+            }
+
             // If there's more than 1 model chunk there will be a Razor error BUT we want intellisense to show up on
             // the current model chunk that the user is typing.
             return chunkTree
@@ -63,9 +72,19 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// <param name="defaultModelName">The <see cref="Type"/> name of the default model.</param>
         /// <returns>The model type name for the generated page.</returns>
         public static string GetModelTypeName(
-            [NotNull] ChunkTree chunkTree,
-            [NotNull] string defaultModelName)
+            ChunkTree chunkTree,
+            string defaultModelName)
         {
+            if (chunkTree == null)
+            {
+                throw new ArgumentNullException(nameof(chunkTree));
+            }
+
+            if (defaultModelName == null)
+            {
+                throw new ArgumentNullException(nameof(defaultModelName));
+            }
+
             var modelChunk = GetModelChunk(chunkTree);
             return modelChunk != null ? modelChunk.ModelType : defaultModelName;
         }
@@ -77,9 +96,20 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// <param name="value">The string to replace the token in.</param>
         /// <param name="modelName">The model name to replace with.</param>
         /// <returns>A string with the token replaced.</returns>
-        public static string ReplaceTModel([NotNull] string value,
-                                           [NotNull] string modelName)
+        public static string ReplaceTModel(
+            string value,
+            string modelName)
         {
+            if (value == null)
+            {
+                throw new ArgumentNullException(nameof(value));
+            }
+
+            if (modelName == null)
+            {
+                throw new ArgumentNullException(nameof(modelName));
+            }
+
             return value.Replace(TModelToken, modelName);
         }
     }

src/Microsoft.AspNet.Mvc.Razor.Host/Directives/ChunkInheritanceUtility.cs

@@ -9,7 +9,6 @@ using Microsoft.AspNet.FileProviders;
 using Microsoft.AspNet.Razor;
 using Microsoft.AspNet.Razor.Chunks;
 using Microsoft.AspNet.Razor.Parser;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Directives
 {
@@ -30,10 +29,25 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// </param>
         /// <param name="defaultInheritedChunks">Sequence of <see cref="Chunk"/>s inherited by default.</param>
         public ChunkInheritanceUtility(
-            [NotNull] MvcRazorHost razorHost,
-            [NotNull] IChunkTreeCache chunkTreeCache,
-            [NotNull] IReadOnlyList<Chunk> defaultInheritedChunks)
+            MvcRazorHost razorHost,
+            IChunkTreeCache chunkTreeCache,
+            IReadOnlyList<Chunk> defaultInheritedChunks)
         {
+            if (razorHost == null)
+            {
+                throw new ArgumentNullException(nameof(razorHost));
+            }
+
+            if (chunkTreeCache == null)
+            {
+                throw new ArgumentNullException(nameof(chunkTreeCache));
+            }
+
+            if (defaultInheritedChunks == null)
+            {
+                throw new ArgumentNullException(nameof(defaultInheritedChunks));
+            }
+
             _razorHost = razorHost;
             _defaultInheritedChunks = defaultInheritedChunks;
             _chunkTreeCache = chunkTreeCache;
@@ -49,8 +63,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// <param name="pagePath">The path of the page to locate inherited chunks for.</param>
         /// <returns>A <see cref="IReadOnlyList{ChunkTreeResult}"/> of parsed <c>_ViewImports</c>
         /// <see cref="ChunkTree"/>s and their file paths.</returns>
-        public virtual IReadOnlyList<ChunkTreeResult> GetInheritedChunkTreeResults([NotNull] string pagePath)
+        public virtual IReadOnlyList<ChunkTreeResult> GetInheritedChunkTreeResults(string pagePath)
         {
+            if (pagePath == null)
+            {
+                throw new ArgumentNullException(nameof(pagePath));
+            }
+
             var inheritedChunkTreeResults = new List<ChunkTreeResult>();
             var templateEngine = new RazorTemplateEngine(_razorHost);
             foreach (var viewImportsPath in ViewHierarchyUtility.GetViewImportsLocations(pagePath))
@@ -85,10 +104,20 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// files.</param>
         /// <param name="defaultModel">The list of chunks to merge.</param>
         public void MergeInheritedChunkTrees(
-            [NotNull] ChunkTree chunkTree,
-            [NotNull] IReadOnlyList<ChunkTree> inheritedChunkTrees,
+            ChunkTree chunkTree,
+            IReadOnlyList<ChunkTree> inheritedChunkTrees,
             string defaultModel)
         {
+            if (chunkTree == null)
+            {
+                throw new ArgumentNullException(nameof(chunkTree));
+            }
+
+            if (inheritedChunkTrees == null)
+            {
+                throw new ArgumentNullException(nameof(inheritedChunkTrees));
+            }
+
             var mergerMappings = GetMergerMappings(chunkTree, defaultModel);
             IChunkMerger merger;
 

src/Microsoft.AspNet.Mvc.Razor.Host/Directives/ChunkTreeResult.cs

@@ -1,8 +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.Razor.Chunks;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Directives
 {
@@ -17,8 +17,18 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// <param name="chunkTree">The <see cref="AspNet.Razor.Chunks.ChunkTree"/> generated from the file at the
         /// given <paramref name="filePath"/>.</param>
         /// <param name="filePath">The path to the file that generated the given <paramref name="chunkTree"/>.</param>
-        public ChunkTreeResult([NotNull] ChunkTree chunkTree, [NotNull] string filePath)
+        public ChunkTreeResult(ChunkTree chunkTree, string filePath)
         {
+            if (chunkTree == null)
+            {
+                throw new ArgumentNullException(nameof(chunkTree));
+            }
+
+            if (filePath == null)
+            {
+                throw new ArgumentNullException(nameof(filePath));
+            }
+
             ChunkTree = chunkTree;
             FilePath = filePath;
         }

src/Microsoft.AspNet.Mvc.Razor.Host/Directives/DefaultChunkTreeCache.cs

@@ -5,7 +5,6 @@ using System;
 using Microsoft.AspNet.FileProviders;
 using Microsoft.AspNet.Razor.Chunks;
 using Microsoft.Framework.Caching.Memory;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Directives
 {
@@ -41,9 +40,19 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
 
         /// <inheritdoc />
         public ChunkTree GetOrAdd(
-            [NotNull] string pagePath,
-            [NotNull] Func<IFileInfo, ChunkTree> getChunkTree)
+            string pagePath,
+            Func<IFileInfo, ChunkTree> getChunkTree)
         {
+            if (pagePath == null)
+            {
+                throw new ArgumentNullException(nameof(pagePath));
+            }
+
+            if (getChunkTree == null)
+            {
+                throw new ArgumentNullException(nameof(getChunkTree));
+            }
+
             ChunkTree chunkTree;
             if (!_chunkTreeCache.TryGetValue(pagePath, out chunkTree))
             {

src/Microsoft.AspNet.Mvc.Razor.Host/Directives/InjectChunkMerger.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNet.Razor.Chunks;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Directives
 {
@@ -20,22 +19,42 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         /// Initializes a new instance of <see cref="InjectChunkMerger"/>.
         /// </summary>
         /// <param name="modelType">The model type to be used to replace &lt;TModel&gt; tokens.</param>
-        public InjectChunkMerger([NotNull] string modelType)
+        public InjectChunkMerger(string modelType)
         {
+            if (modelType == null)
+            {
+                throw new ArgumentNullException(nameof(modelType));
+            }
+
             _modelType = "<" + modelType + ">";
         }
 
         /// <inheritdoc />
-        public void VisitChunk([NotNull] Chunk chunk)
+        public void VisitChunk(Chunk chunk)
         {
+            if (chunk == null)
+            {
+                throw new ArgumentNullException(nameof(chunk));
+            }
+
             var injectChunk = ChunkHelper.EnsureChunk<InjectChunk>(chunk);
             injectChunk.TypeName = ChunkHelper.ReplaceTModel(injectChunk.TypeName, _modelType);
             _addedMemberNames.Add(injectChunk.MemberName);
         }
 
         /// <inheritdoc />
-        public void Merge([NotNull] ChunkTree chunkTree, [NotNull] Chunk chunk)
+        public void Merge(ChunkTree chunkTree, Chunk chunk)
         {
+            if (chunkTree == null)
+            {
+                throw new ArgumentNullException(nameof(chunkTree));
+            }
+
+            if (chunk == null)
+            {
+                throw new ArgumentNullException(nameof(chunk));
+            }
+
             var injectChunk = ChunkHelper.EnsureChunk<InjectChunk>(chunk);
             if (!_addedMemberNames.Contains(injectChunk.MemberName))
             {

src/Microsoft.AspNet.Mvc.Razor.Host/Directives/SetBaseTypeChunkMerger.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.Razor.Chunks;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Directives
 {
@@ -24,16 +24,31 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         }
 
         /// <inheritdoc />
-        public void VisitChunk([NotNull] Chunk chunk)
+        public void VisitChunk(Chunk chunk)
         {
+            if (chunk == null)
+            {
+                throw new ArgumentNullException(nameof(chunk));
+            }
+
             var setBaseTypeChunk = ChunkHelper.EnsureChunk<SetBaseTypeChunk>(chunk);
             setBaseTypeChunk.TypeName = ChunkHelper.ReplaceTModel(setBaseTypeChunk.TypeName, _modelType);
             _isBaseTypeSet = true;
         }
 
         /// <inheritdoc />
-        public void Merge([NotNull] ChunkTree chunkTree, [NotNull] Chunk chunk)
+        public void Merge(ChunkTree chunkTree, Chunk chunk)
         {
+            if (chunkTree == null)
+            {
+                throw new ArgumentNullException(nameof(chunkTree));
+            }
+
+            if (chunk == null)
+            {
+                throw new ArgumentNullException(nameof(chunk));
+            }
+
             if (!_isBaseTypeSet)
             {
                 var baseTypeChunk = ChunkHelper.EnsureChunk<SetBaseTypeChunk>(chunk);

src/Microsoft.AspNet.Mvc.Razor.Host/Directives/UsingChunkMerger.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNet.Razor.Chunks;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Directives
 {
@@ -16,15 +15,30 @@ namespace Microsoft.AspNet.Mvc.Razor.Directives
         private readonly HashSet<string> _currentUsings = new HashSet<string>(StringComparer.Ordinal);
 
         /// <inheritdoc />
-        public void VisitChunk([NotNull] Chunk chunk)
+        public void VisitChunk(Chunk chunk)
         {
+            if (chunk == null)
+            {
+                throw new ArgumentNullException(nameof(chunk));
+            }
+
             var namespaceChunk = ChunkHelper.EnsureChunk<UsingChunk>(chunk);
             _currentUsings.Add(namespaceChunk.Namespace);
         }
 
         /// <inheritdoc />
-        public void Merge([NotNull] ChunkTree chunkTree, [NotNull] Chunk chunk)
+        public void Merge(ChunkTree chunkTree, Chunk chunk)
         {
+            if (chunkTree == null)
+            {
+                throw new ArgumentNullException(nameof(chunkTree));
+            }
+
+            if (chunk == null)
+            {
+                throw new ArgumentNullException(nameof(chunk));
+            }
+
             var namespaceChunk = ChunkHelper.EnsureChunk<UsingChunk>(chunk);
 
             if (!_currentUsings.Contains(namespaceChunk.Namespace))

src/Microsoft.AspNet.Mvc.Razor.Host/InjectChunkVisitor.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.Collections.Generic;
 using Microsoft.AspNet.Razor.CodeGenerators;
 using Microsoft.AspNet.Razor.CodeGenerators.Visitors;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -12,18 +12,38 @@ namespace Microsoft.AspNet.Mvc.Razor
     {
         private readonly string _injectAttribute;
 
-        public InjectChunkVisitor([NotNull] CSharpCodeWriter writer,
-                                  [NotNull] CodeGeneratorContext context,
-                                  [NotNull] string injectAttributeName)
+        public InjectChunkVisitor(CSharpCodeWriter writer,
+                                  CodeGeneratorContext context,
+                                  string injectAttributeName)
             : base(writer, context)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (injectAttributeName == null)
+            {
+                throw new ArgumentNullException(nameof(injectAttributeName));
+            }
+
             _injectAttribute = "[" + injectAttributeName + "]";
         }
 
         public IList<InjectChunk> InjectChunks { get; } = new List<InjectChunk>();
 
-        protected override void Visit([NotNull] InjectChunk chunk)
+        protected override void Visit(InjectChunk chunk)
         {
+            if (chunk == null)
+            {
+                throw new ArgumentNullException(nameof(chunk));
+            }
+
             Writer.WriteLine(_injectAttribute);
 
             // Some of the chunks that we visit are either InjectDescriptors that are added by default or

src/Microsoft.AspNet.Mvc.Razor.Host/Internal/DesignTimeRazorPathNormalizer.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.IO;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Internal
 {
@@ -11,13 +10,23 @@ namespace Microsoft.AspNet.Mvc.Razor.Internal
     {
         private readonly string _applicationRoot;
 
-        public DesignTimeRazorPathNormalizer([NotNull] string applicationRoot)
+        public DesignTimeRazorPathNormalizer(string applicationRoot)
         {
+            if (applicationRoot == null)
+            {
+                throw new ArgumentNullException(nameof(applicationRoot));
+            }
+
             _applicationRoot = applicationRoot;
         }
 
-        public override string NormalizePath([NotNull] string path)
+        public override string NormalizePath(string path)
         {
+            if (path == null)
+            {
+                throw new ArgumentNullException(nameof(path));
+            }
+
             // Need to convert path to application relative (rooted paths are passed in during design time).
             if (Path.IsPathRooted(path) && path.StartsWith(_applicationRoot, StringComparison.Ordinal))
             {

src/Microsoft.AspNet.Mvc.Razor.Host/Internal/RazorPathNormalizer.cs

@@ -1,14 +1,19 @@
 // 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 System;
 
 namespace Microsoft.AspNet.Mvc.Razor.Internal
 {
     public class RazorPathNormalizer
     {
-        public virtual string NormalizePath([NotNull] string path)
+        public virtual string NormalizePath(string path)
         {
+            if (path == null)
+            {
+                throw new ArgumentNullException(nameof(path));
+            }
+
             return path;
         }
     }

src/Microsoft.AspNet.Mvc.Razor.Host/ModelChunkVisitor.cs

@@ -1,19 +1,28 @@
 // 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.Razor.CodeGenerators;
 using Microsoft.AspNet.Razor.CodeGenerators.Visitors;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
     public class ModelChunkVisitor : MvcCSharpCodeVisitor
     {
         public ModelChunkVisitor(
-            [NotNull] CSharpCodeWriter writer,
-            [NotNull] CodeGeneratorContext context)
+            CSharpCodeWriter writer,
+            CodeGeneratorContext context)
             : base(writer, context)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
         }
 
         protected override void Visit(ModelChunk chunk)

src/Microsoft.AspNet.Mvc.Razor.Host/MvcCSharpChunkVisitor.cs

@@ -1,19 +1,27 @@
 // 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.Razor.Chunks;
 using Microsoft.AspNet.Razor.CodeGenerators;
 using Microsoft.AspNet.Razor.CodeGenerators.Visitors;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
     public abstract class MvcCSharpChunkVisitor : CodeVisitor<CSharpCodeWriter>
     {
-        public MvcCSharpChunkVisitor([NotNull] CSharpCodeWriter writer,
-                                     [NotNull] CodeGeneratorContext context)
+        public MvcCSharpChunkVisitor(CSharpCodeWriter writer,
+                                     CodeGeneratorContext context)
             : base(writer, context)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
         }
 
         public override void Accept(Chunk chunk)

src/Microsoft.AspNet.Mvc.Razor.Host/MvcCSharpCodeGenerator.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.Globalization;
 using Microsoft.AspNet.Mvc.Razor.Directives;
 using Microsoft.AspNet.Razor.CodeGenerators;
 using Microsoft.AspNet.Razor.CodeGenerators.Visitors;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -16,12 +16,32 @@ namespace Microsoft.AspNet.Mvc.Razor
         private readonly string _injectAttribute;
 
         public MvcCSharpCodeGenerator(
-            [NotNull] CodeGeneratorContext context,
-            [NotNull] string defaultModel,
-            [NotNull] string injectAttribute,
-            [NotNull] GeneratedTagHelperAttributeContext tagHelperAttributeContext)
+            CodeGeneratorContext context,
+            string defaultModel,
+            string injectAttribute,
+            GeneratedTagHelperAttributeContext tagHelperAttributeContext)
             : base(context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (defaultModel == null)
+            {
+                throw new ArgumentNullException(nameof(defaultModel));
+            }
+
+            if (injectAttribute == null)
+            {
+                throw new ArgumentNullException(nameof(injectAttribute));
+            }
+
+            if (tagHelperAttributeContext == null)
+            {
+                throw new ArgumentNullException(nameof(tagHelperAttributeContext));
+            }
+
             _tagHelperAttributeContext = tagHelperAttributeContext;
             _defaultModel = defaultModel;
             _injectAttribute = injectAttribute;
@@ -30,9 +50,19 @@ namespace Microsoft.AspNet.Mvc.Razor
         private string Model { get; set; }
 
         protected override CSharpCodeVisitor CreateCSharpCodeVisitor(
-            [NotNull] CSharpCodeWriter writer,
-            [NotNull] CodeGeneratorContext context)
+            CSharpCodeWriter writer,
+            CodeGeneratorContext context)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var csharpCodeVisitor = base.CreateCSharpCodeVisitor(writer, context);
 
             csharpCodeVisitor.TagHelperRenderer.AttributeValueCodeRenderer =
@@ -67,8 +97,13 @@ namespace Microsoft.AspNet.Mvc.Razor
             }
         }
 
-        protected override void BuildConstructor([NotNull] CSharpCodeWriter writer)
+        protected override void BuildConstructor(CSharpCodeWriter writer)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
             base.BuildConstructor(writer);
 
             writer.WriteLineHiddenDirective();

src/Microsoft.AspNet.Mvc.Razor.Host/MvcCSharpCodeVistor.cs

@@ -1,23 +1,33 @@
 // 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.Razor.CodeGenerators;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
     public abstract class MvcCSharpCodeVisitor : MvcCSharpChunkVisitor
     {
         public MvcCSharpCodeVisitor(
-            [NotNull] CSharpCodeWriter writer,
-            [NotNull] CodeGeneratorContext context)
+            CSharpCodeWriter writer,
+            CodeGeneratorContext context)
             : base(writer, context)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
         }
 
         protected override void Visit(InjectChunk chunk)
         {
         }
+
         protected override void Visit(ModelChunk chunk)
         {
         }

src/Microsoft.AspNet.Mvc.Razor.Host/MvcRazorHost.cs

@@ -1,6 +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 System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -15,7 +16,6 @@ using Microsoft.AspNet.Razor.CodeGenerators;
 using Microsoft.AspNet.Razor.Parser;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -151,9 +151,13 @@ namespace Microsoft.AspNet.Mvc.Razor
 
                 return _tagHelperDescriptorResolver;
             }
-            [param: NotNull]
             set
             {
+                if (value == null)
+                {
+                    throw new ArgumentNullException(nameof(value));
+                }
+
                 _tagHelperDescriptorResolver = value;
             }
         }
@@ -231,8 +235,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="sourceFileName">The path to a Razor file to locate _ViewImports.cshtml for.</param>
         /// <returns>Inherited <see cref="ChunkTreeResult"/>s.</returns>
-        public IReadOnlyList<ChunkTreeResult> GetInheritedChunkTreeResults([NotNull] string sourceFileName)
+        public IReadOnlyList<ChunkTreeResult> GetInheritedChunkTreeResults(string sourceFileName)
         {
+            if (sourceFileName == null)
+            {
+                throw new ArgumentNullException(nameof(sourceFileName));
+            }
+
             // Need the normalized path to resolve inherited chunks only. Full paths are needed for generated Razor
             // files checksum and line pragmas to enable DesignTime debugging.
             var normalizedPath = _pathNormalizer.NormalizePath(sourceFileName);
@@ -250,24 +259,44 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public override RazorParser DecorateRazorParser([NotNull] RazorParser razorParser, string sourceFileName)
+        public override RazorParser DecorateRazorParser(RazorParser razorParser, string sourceFileName)
         {
+            if (razorParser == null)
+            {
+                throw new ArgumentNullException(nameof(razorParser));
+            }
+
             var inheritedChunkTrees = GetInheritedChunkTrees(sourceFileName);
 
             return new MvcRazorParser(razorParser, inheritedChunkTrees, DefaultInheritedChunks, ModelExpressionType);
         }
 
         /// <inheritdoc />
-        public override ParserBase DecorateCodeParser([NotNull] ParserBase incomingCodeParser)
+        public override ParserBase DecorateCodeParser(ParserBase incomingCodeParser)
         {
+            if (incomingCodeParser == null)
+            {
+                throw new ArgumentNullException(nameof(incomingCodeParser));
+            }
+
             return new MvcRazorCodeParser(_baseType);
         }
 
         /// <inheritdoc />
         public override CodeGenerator DecorateCodeGenerator(
-            [NotNull] CodeGenerator incomingGenerator,
-            [NotNull] CodeGeneratorContext context)
+            CodeGenerator incomingGenerator,
+            CodeGeneratorContext context)
         {
+            if (incomingGenerator == null)
+            {
+                throw new ArgumentNullException(nameof(incomingGenerator));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var inheritedChunkTrees = GetInheritedChunkTrees(context.SourceFile);
 
             ChunkInheritanceUtility.MergeInheritedChunkTrees(

src/Microsoft.AspNet.Mvc.Razor.Host/MvcRazorParser.cs

@@ -11,7 +11,6 @@ using Microsoft.AspNet.Razor.Parser;
 using Microsoft.AspNet.Razor.Parser.SyntaxTree;
 using Microsoft.AspNet.Razor.Parser.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -33,12 +32,32 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <param name="defaultInheritedChunks">The <see cref="IReadOnlyList{Chunk}"/> inherited by
         /// default by all Razor pages in the application.</param>
         public MvcRazorParser(
-            [NotNull] RazorParser parser,
-            [NotNull] IReadOnlyList<ChunkTree> inheritedChunkTrees,
-            [NotNull] IReadOnlyList<Chunk> defaultInheritedChunks,
-            [NotNull] string modelExpressionTypeName)
+            RazorParser parser,
+            IReadOnlyList<ChunkTree> inheritedChunkTrees,
+            IReadOnlyList<Chunk> defaultInheritedChunks,
+            string modelExpressionTypeName)
             : base(parser)
         {
+            if (parser == null)
+            {
+                throw new ArgumentNullException(nameof(parser));
+            }
+
+            if (inheritedChunkTrees == null)
+            {
+                throw new ArgumentNullException(nameof(inheritedChunkTrees));
+            }
+
+            if (defaultInheritedChunks == null)
+            {
+                throw new ArgumentNullException(nameof(defaultInheritedChunks));
+            }
+
+            if (modelExpressionTypeName == null)
+            {
+                throw new ArgumentNullException(nameof(modelExpressionTypeName));
+            }
+
             // Construct tag helper descriptors from @addTagHelper, @removeTagHelper and @tagHelperPrefix chunks
             _viewImportsDirectiveDescriptors = GetTagHelperDirectiveDescriptors(
                 inheritedChunkTrees,
@@ -49,9 +68,19 @@ namespace Microsoft.AspNet.Mvc.Razor
 
         /// <inheritdoc />
         protected override IEnumerable<TagHelperDescriptor> GetTagHelperDescriptors(
-            [NotNull] Block documentRoot,
-            [NotNull] ErrorSink errorSink)
+            Block documentRoot,
+            ErrorSink errorSink)
         {
+            if (documentRoot == null)
+            {
+                throw new ArgumentNullException(nameof(documentRoot));
+            }
+
+            if (errorSink == null)
+            {
+                throw new ArgumentNullException(nameof(errorSink));
+            }
+
             var visitor = new ViewImportsTagHelperDirectiveSpanVisitor(
                 TagHelperDescriptorResolver,
                 _viewImportsDirectiveDescriptors,

src/Microsoft.AspNet.Mvc.Razor.Host/MvcTagHelperAttributeValueCodeRenderer.cs

@@ -4,7 +4,6 @@
 using System;
 using Microsoft.AspNet.Razor.CodeGenerators;
 using Microsoft.AspNet.Razor.TagHelpers;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -19,8 +18,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// Instantiates a new instance of <see cref="MvcTagHelperAttributeValueCodeRenderer"/>.
         /// </summary>
         /// <param name="context">Contains code generation information for rendering attribute values.</param>
-        public MvcTagHelperAttributeValueCodeRenderer([NotNull] GeneratedTagHelperAttributeContext context)
+        public MvcTagHelperAttributeValueCodeRenderer(GeneratedTagHelperAttributeContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             _context = context;
         }
 
@@ -30,12 +34,32 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// created by calling into <see cref="GeneratedTagHelperAttributeContext.CreateModelExpressionMethodName"/>.
         /// </remarks>
         public override void RenderAttributeValue(
-            [NotNull] TagHelperAttributeDescriptor attributeDescriptor,
-            [NotNull] CSharpCodeWriter writer,
-            [NotNull] CodeGeneratorContext codeGeneratorContext,
-            [NotNull] Action<CSharpCodeWriter> renderAttributeValue,
+            TagHelperAttributeDescriptor attributeDescriptor,
+            CSharpCodeWriter writer,
+            CodeGeneratorContext codeGeneratorContext,
+            Action<CSharpCodeWriter> renderAttributeValue,
             bool complexValue)
         {
+            if (attributeDescriptor == null)
+            {
+                throw new ArgumentNullException(nameof(attributeDescriptor));
+            }
+
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (codeGeneratorContext == null)
+            {
+                throw new ArgumentNullException(nameof(codeGeneratorContext));
+            }
+
+            if (renderAttributeValue == null)
+            {
+                throw new ArgumentNullException(nameof(renderAttributeValue));
+            }
+
             if (attributeDescriptor.TypeName.Equals(_context.ModelExpressionTypeName, StringComparison.Ordinal))
             {
                 writer

src/Microsoft.AspNet.Mvc.Razor.Host/project.json

@@ -12,8 +12,7 @@
     "Microsoft.AspNet.FileProviders.Physical": "1.0.0-*",
     "Microsoft.AspNet.Razor.Runtime": "4.0.0-*",
     "Microsoft.Framework.Caching.Memory": "1.0.0-*",
-    "Microsoft.Framework.PropertyHelper.Sources": { "version": "1.0.0-*", "type": "build" },
-    "Microsoft.Framework.NotNullAttribute.Sources": { "version": "1.0.0-*", "type": "build" }
+    "Microsoft.Framework.PropertyHelper.Sources": { "version": "1.0.0-*", "type": "build" }
   },
   "frameworks": {
     "net45": { },

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilationFailedException.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.Dnx.Compilation;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
 {
@@ -20,9 +19,14 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// <param name="compilationFailures"><see cref="CompilationFailure"/>s containing
         /// details of the compilation failure.</param>
         public CompilationFailedException(
-                [NotNull] IEnumerable<CompilationFailure> compilationFailures)
+                IEnumerable<CompilationFailure> compilationFailures)
             : base(FormatMessage(compilationFailures))
         {
+            if (compilationFailures == null)
+            {
+                throw new ArgumentNullException(nameof(compilationFailures));
+            }
+
             CompilationFailures = compilationFailures;
         }
 

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilationOptionsProviderExtension.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 Microsoft.Dnx.Compilation;
 using Microsoft.Dnx.Compilation.CSharp;
 using Microsoft.Dnx.Runtime;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
 {
@@ -25,9 +25,19 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// </param>
         /// <returns>The <see cref="CompilationSettings"/> for the current application.</returns>
         public static CompilationSettings GetCompilationSettings(
-            [NotNull] this ICompilerOptionsProvider compilerOptionsProvider,
-            [NotNull] IApplicationEnvironment applicationEnvironment)
+            this ICompilerOptionsProvider compilerOptionsProvider,
+            IApplicationEnvironment applicationEnvironment)
         {
+            if (compilerOptionsProvider == null)
+            {
+                throw new ArgumentNullException(nameof(compilerOptionsProvider));
+            }
+
+            if (applicationEnvironment == null)
+            {
+                throw new ArgumentNullException(nameof(applicationEnvironment));
+            }
+
             return compilerOptionsProvider.GetCompilerOptions(applicationEnvironment.ApplicationName,
                                                               applicationEnvironment.RuntimeFramework,
                                                               applicationEnvironment.Configuration)

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilationResult.cs

@@ -3,9 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.IO;
-using Microsoft.Framework.Internal;
-using Microsoft.Dnx.Runtime;
 using Microsoft.Dnx.Compilation;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
@@ -61,8 +58,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// <param name="compilationFailures"><see cref="CompilationFailure"/>s produced from parsing or
         /// compiling the Razor file.</param>
         /// <returns>A <see cref="CompilationResult"/> instance for a failed compilation.</returns>
-        public static CompilationResult Failed([NotNull] IEnumerable<CompilationFailure> compilationFailures)
+        public static CompilationResult Failed(IEnumerable<CompilationFailure> compilationFailures)
         {
+            if (compilationFailures == null)
+            {
+                throw new ArgumentNullException(nameof(compilationFailures));
+            }
+
             return new CompilationResult
             {
                 CompilationFailures = compilationFailures
@@ -74,8 +76,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// </summary>
         /// <param name="type">The compiled type.</param>
         /// <returns>A <see cref="CompilationResult"/> instance for a successful compilation.</returns>
-        public static CompilationResult Successful([NotNull] Type type)
+        public static CompilationResult Successful(Type type)
         {
+            if (type == null)
+            {
+                throw new ArgumentNullException(nameof(type));
+            }
+
             return new CompilationResult
             {
                 CompiledType = type

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilerCache.cs

@@ -8,7 +8,6 @@ using System.Diagnostics;
 using System.Text;
 using Microsoft.AspNet.FileProviders;
 using Microsoft.Framework.Caching.Memory;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
 {
@@ -27,8 +26,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// Initializes a new instance of <see cref="CompilerCache"/>.
         /// </summary>
         /// <param name="fileProvider"><see cref="IFileProvider"/> used to locate Razor views.</param>
-        public CompilerCache([NotNull] IFileProvider fileProvider)
+        public CompilerCache(IFileProvider fileProvider)
         {
+            if (fileProvider == null)
+            {
+                throw new ArgumentNullException(nameof(fileProvider));
+            }
+
             _fileProvider = fileProvider;
             _cache = new MemoryCache(new MemoryCacheOptions { CompactOnMemoryPressure = false });
         }
@@ -41,10 +45,20 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// <param name="precompiledViews">A mapping of application relative paths of view to the precompiled view
         /// <see cref="Type"/>s.</param>
         public CompilerCache(
-            [NotNull] IFileProvider fileProvider,
-            [NotNull] IDictionary<string, Type> precompiledViews)
+            IFileProvider fileProvider,
+            IDictionary<string, Type> precompiledViews)
             : this(fileProvider)
         {
+            if (fileProvider == null)
+            {
+                throw new ArgumentNullException(nameof(fileProvider));
+            }
+
+            if (precompiledViews == null)
+            {
+                throw new ArgumentNullException(nameof(precompiledViews));
+            }
+
             foreach (var item in precompiledViews)
             {
                 var cacheEntry = new CompilerCacheResult(CompilationResult.Successful(item.Value));
@@ -54,9 +68,19 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
 
         /// <inheritdoc />
         public CompilerCacheResult GetOrAdd(
-            [NotNull] string relativePath,
-            [NotNull] Func<RelativeFileInfo, CompilationResult> compile)
+            string relativePath,
+            Func<RelativeFileInfo, CompilationResult> compile)
         {
+            if (relativePath == null)
+            {
+                throw new ArgumentNullException(nameof(relativePath));
+            }
+
+            if (compile == null)
+            {
+                throw new ArgumentNullException(nameof(compile));
+            }
+
             CompilerCacheResult cacheResult;
             // Attempt to lookup the cache entry using the passed in path. This will succeed if the path is already
             // normalized and a cache entry exists.

src/Microsoft.AspNet.Mvc.Razor/Compilation/CompilerCacheResult.cs

@@ -1,7 +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.Framework.Internal;
+using System;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
 {
@@ -21,8 +21,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// <see cref="CompilationResult"/>.
         /// </summary>
         /// <param name="compilationResult">The <see cref="Compilation.CompilationResult"/> </param>
-        public CompilerCacheResult([NotNull] CompilationResult compilationResult)
+        public CompilerCacheResult(CompilationResult compilationResult)
         {
+            if (compilationResult == null)
+            {
+                throw new ArgumentNullException(nameof(compilationResult));
+            }
+
             CompilationResult = compilationResult;
         }
 

src/Microsoft.AspNet.Mvc.Razor/Compilation/ICompilerCache.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
 {
@@ -18,7 +17,8 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// <param name="relativePath">Application relative path to the file.</param>
         /// <param name="compile">An delegate that will generate a compilation result.</param>
         /// <returns>A cached <see cref="CompilationResult"/>.</returns>
-        CompilerCacheResult GetOrAdd([NotNull] string relativePath,
-                                     [NotNull] Func<RelativeFileInfo, CompilationResult> compile);
+        CompilerCacheResult GetOrAdd(
+            string relativePath,
+            Func<RelativeFileInfo, CompilationResult> compile);
     }
 }

src/Microsoft.AspNet.Mvc.Razor/Compilation/RazorCompilationService.cs

@@ -10,7 +10,6 @@ using Microsoft.AspNet.Razor;
 using Microsoft.AspNet.Razor.CodeGenerators;
 using Microsoft.Dnx.Compilation;
 using Microsoft.Dnx.Runtime;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
@@ -43,8 +42,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         }
 
         /// <inheritdoc />
-        public CompilationResult Compile([NotNull] RelativeFileInfo file)
+        public CompilationResult Compile(RelativeFileInfo file)
         {
+            if (file == null)
+            {
+                throw new ArgumentNullException(nameof(file));
+            }
+
             GeneratorResults results;
             using (var inputStream = file.FileInfo.CreateReadStream())
             {

src/Microsoft.AspNet.Mvc.Razor/Compilation/RelativeFileInfo.cs

@@ -3,7 +3,6 @@
 
 using System;
 using Microsoft.AspNet.FileProviders;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
 {
@@ -18,8 +17,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// </summary>
         /// <param name="fileInfo"><see cref="IFileInfo"/> for the file.</param>
         /// <param name="relativePath">Path of the file relative to the application base.</param>
-        public RelativeFileInfo([NotNull] IFileInfo fileInfo, string relativePath)
+        public RelativeFileInfo(IFileInfo fileInfo, string relativePath)
         {
+            if (fileInfo == null)
+            {
+                throw new ArgumentNullException(nameof(fileInfo));
+            }
+
             if (string.IsNullOrEmpty(relativePath))
             {
                 throw new ArgumentException(Resources.ArgumentCannotBeNullOrEmpty, nameof(relativePath));

src/Microsoft.AspNet.Mvc.Razor/Compilation/RoslynCompilationService.cs

@@ -17,7 +17,6 @@ using Microsoft.CodeAnalysis.Emit;
 using Microsoft.Dnx.Compilation;
 using Microsoft.Dnx.Compilation.CSharp;
 using Microsoft.Dnx.Runtime;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
@@ -69,8 +68,18 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         }
 
         /// <inheritdoc />
-        public CompilationResult Compile([NotNull] RelativeFileInfo fileInfo, [NotNull] string compilationContent)
+        public CompilationResult Compile(RelativeFileInfo fileInfo, string compilationContent)
         {
+            if (fileInfo == null)
+            {
+                throw new ArgumentNullException(nameof(fileInfo));
+            }
+
+            if (compilationContent == null)
+            {
+                throw new ArgumentNullException(nameof(compilationContent));
+            }
+
             var assemblyName = Path.GetRandomFileName();
             var compilationSettings = _compilerOptionsProvider.GetCompilationSettings(_environment);
             var syntaxTree = SyntaxTreeGenerator.Generate(compilationContent,

src/Microsoft.AspNet.Mvc.Razor/Compilation/SyntaxTreeGenerator.cs

@@ -1,21 +1,37 @@
 // 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 Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.Text;
 using Microsoft.Dnx.Compilation.CSharp;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
 {
     public static class SyntaxTreeGenerator
     {
-        public static SyntaxTree Generate([NotNull] string text,
-                                          [NotNull] string path,
-                                          [NotNull] CompilationSettings compilationSettings)
+        public static SyntaxTree Generate(
+            string text,
+            string path,
+            CompilationSettings compilationSettings)
         {
+            if (text == null)
+            {
+                throw new ArgumentNullException(nameof(text));
+            }
+
+            if (path == null)
+            {
+                throw new ArgumentNullException(nameof(path));
+            }
+
+            if (compilationSettings == null)
+            {
+                throw new ArgumentNullException(nameof(compilationSettings));
+            }
+
             var sourceText = SourceText.From(text, Encoding.UTF8);
             var syntaxTree = CSharpSyntaxTree.ParseText(sourceText,
                 path: path,

src/Microsoft.AspNet.Mvc.Razor/Compilation/UncachedCompilationResult.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Compilation
 {
@@ -24,9 +23,20 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
         /// <param name="compiledContent">The generated C# content that was compiled.</param>
         /// <returns>An <see cref="UncachedCompilationResult"/> instance that indicates a successful
         /// compilation.</returns>
-        public static UncachedCompilationResult Successful([NotNull] Type type,
-                                                           [NotNull] string compiledContent)
+        public static UncachedCompilationResult Successful(
+            Type type,
+            string compiledContent)
         {
+            if (type == null)
+            {
+                throw new ArgumentNullException(nameof(type));
+            }
+
+            if (compiledContent == null)
+            {
+                throw new ArgumentNullException(nameof(compiledContent));
+            }
+
             return new UncachedCompilationResult
             {
                 CompiledType = type,

src/Microsoft.AspNet.Mvc.Razor/DefaultTagHelperActivator.cs

@@ -33,9 +33,19 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public void Activate<TTagHelper>([NotNull] TTagHelper tagHelper, [NotNull] ViewContext context)
+        public void Activate<TTagHelper>(TTagHelper tagHelper, ViewContext context)
             where TTagHelper : ITagHelper
         {
+            if (tagHelper == null)
+            {
+                throw new ArgumentNullException(nameof(tagHelper));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var propertiesToActivate = _injectActions.GetOrAdd(
                 tagHelper.GetType(),
                 _getPropertiesToActivate);

src/Microsoft.AspNet.Mvc.Razor/DefaultViewLocationCache.cs

@@ -26,8 +26,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public ViewLocationCacheResult Get([NotNull] ViewLocationExpanderContext context)
+        public ViewLocationCacheResult Get(ViewLocationExpanderContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var cacheKey = GenerateKey(context, copyViewExpanderValues: false);
             ViewLocationCacheResult result;
             if (_cache.TryGetValue(cacheKey, out result))
@@ -40,9 +45,14 @@ namespace Microsoft.AspNet.Mvc.Razor
 
         /// <inheritdoc />
         public void Set(
-            [NotNull] ViewLocationExpanderContext context,
-            [NotNull] ViewLocationCacheResult value)
+            ViewLocationExpanderContext context,
+            ViewLocationCacheResult value)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var cacheKey = GenerateKey(context, copyViewExpanderValues: true);
             _cache.TryAdd(cacheKey, value);
         }

src/Microsoft.AspNet.Mvc.Razor/DependencyInjection/MvcRazorMvcBuilderExtensions.cs

@@ -4,13 +4,11 @@
 using System;
 using System.Linq;
 using System.Reflection;
-using Microsoft.AspNet.Mvc;
 using Microsoft.AspNet.Mvc.Razor;
 using Microsoft.AspNet.Mvc.Razor.Compilation;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.Framework.DependencyInjection.Extensions;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.Framework.DependencyInjection
 {
@@ -26,9 +24,19 @@ namespace Microsoft.Framework.DependencyInjection
         /// <param name="setupAction">An action to configure the <see cref="RazorViewEngineOptions"/>.</param>
         /// <returns>The <see cref="IMvcBuilder"/>.</returns>
         public static IMvcBuilder AddRazorOptions(
-            [NotNull] this IMvcBuilder builder,
-            [NotNull] Action<RazorViewEngineOptions> setupAction)
+            this IMvcBuilder builder,
+            Action<RazorViewEngineOptions> setupAction)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (setupAction == null)
+            {
+                throw new ArgumentNullException(nameof(setupAction));
+            }
+
             builder.Services.Configure(setupAction);
             return builder;
         }
@@ -45,10 +53,20 @@ namespace Microsoft.Framework.DependencyInjection
         /// <param name="initialize">An action to initialize the <typeparamref name="TTagHelper"/>.</param>
         /// <returns>The <see cref="IMvcBuilder"/> instance this method extends.</returns>
         public static IMvcBuilder InitializeTagHelper<TTagHelper>(
-            [NotNull] this IMvcBuilder builder,
-            [NotNull] Action<TTagHelper, ViewContext> initialize)
+            this IMvcBuilder builder,
+            Action<TTagHelper, ViewContext> initialize)
             where TTagHelper : ITagHelper
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (initialize == null)
+            {
+                throw new ArgumentNullException(nameof(initialize));
+            }
+
             var initializer = new TagHelperInitializer<TTagHelper>(initialize);
 
             builder.Services.AddInstance(typeof(ITagHelperInitializer<TTagHelper>), initializer);
@@ -57,9 +75,19 @@ namespace Microsoft.Framework.DependencyInjection
         }
 
         public static IMvcBuilder AddPrecompiledRazorViews(
-            [NotNull] this IMvcBuilder builder,
-            [NotNull] params Assembly[] assemblies)
+            this IMvcBuilder builder,
+            params Assembly[] assemblies)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (assemblies == null)
+            {
+                throw new ArgumentNullException(nameof(assemblies));
+            }
+
             builder.Services.Replace(
                 ServiceDescriptor.Singleton<ICompilerCacheProvider>(serviceProvider =>
                     ActivatorUtilities.CreateInstance<PrecompiledViewsCompilerCacheProvider>(

src/Microsoft.AspNet.Mvc.Razor/DependencyInjection/MvcRazorMvcCoreBuilderExtensions.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;
@@ -13,24 +13,38 @@ using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.Framework.Caching.Memory;
 using Microsoft.Framework.DependencyInjection.Extensions;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
 
 namespace Microsoft.Framework.DependencyInjection
 {
     public static class MvcRazorMvcCoreBuilderExtensions
     {
-        public static IMvcCoreBuilder AddRazorViewEngine([NotNull] this IMvcCoreBuilder builder)
+        public static IMvcCoreBuilder AddRazorViewEngine(this IMvcCoreBuilder builder)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
             builder.AddViews();
             AddRazorViewEngineServices(builder.Services);
             return builder;
         }
 
         public static IMvcCoreBuilder AddRazorViewEngine(
-            [NotNull] this IMvcCoreBuilder builder,
-            [NotNull] Action<RazorViewEngineOptions> setupAction)
+            this IMvcCoreBuilder builder,
+            Action<RazorViewEngineOptions> setupAction)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (setupAction == null)
+            {
+                throw new ArgumentNullException(nameof(setupAction));
+            }
+
             builder.AddViews();
             AddRazorViewEngineServices(builder.Services);
 
@@ -43,9 +57,19 @@ namespace Microsoft.Framework.DependencyInjection
         }
 
         public static IMvcCoreBuilder AddPrecompiledRazorViews(
-            [NotNull] this IMvcCoreBuilder builder,
-            [NotNull] params Assembly[] assemblies)
+            this IMvcCoreBuilder builder,
+            params Assembly[] assemblies)
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (assemblies == null)
+            {
+                throw new ArgumentNullException(nameof(assemblies));
+            }
+
             AddRazorViewEngine(builder);
 
             builder.Services.Replace(
@@ -69,10 +93,20 @@ namespace Microsoft.Framework.DependencyInjection
         /// <param name="initialize">An action to initialize the <typeparamref name="TTagHelper"/>.</param>
         /// <returns>The <see cref="IMvcCoreBuilder"/> instance this method extends.</returns>
         public static IMvcCoreBuilder InitializeTagHelper<TTagHelper>(
-            [NotNull] this IMvcCoreBuilder builder,
-            [NotNull] Action<TTagHelper, ViewContext> initialize)
+            this IMvcCoreBuilder builder,
+            Action<TTagHelper, ViewContext> initialize)
             where TTagHelper : ITagHelper
         {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            if (initialize == null)
+            {
+                throw new ArgumentNullException(nameof(initialize));
+            }
+
             var initializer = new TagHelperInitializer<TTagHelper>(initialize);
 
             builder.Services.AddInstance(typeof(ITagHelperInitializer<TTagHelper>), initializer);

src/Microsoft.AspNet.Mvc.Razor/HelperResult.cs

@@ -5,7 +5,6 @@ using System;
 using System.IO;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.Razor
@@ -24,8 +23,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <see cref="WriteTo(TextWriter, IHtmlEncoder)"/> is called.</param>
         /// <remarks>Calls to <see cref="WriteTo(TextWriter, IHtmlEncoder)"/> result in a blocking invocation of
         /// <paramref name="asyncAction"/>.</remarks>
-        public HelperResult([NotNull] Func<TextWriter, Task> asyncAction)
+        public HelperResult(Func<TextWriter, Task> asyncAction)
         {
+            if (asyncAction == null)
+            {
+                throw new ArgumentNullException(nameof(asyncAction));
+            }
+
             _asyncAction = asyncAction;
         }
 
@@ -42,8 +46,18 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="writer">The <see cref="TextWriter"/> instance to write to.</param>
         /// <param name="encoder">The <see cref="IHtmlEncoder"/> to encode the content.</param>
-        public virtual void WriteTo([NotNull] TextWriter writer, [NotNull] IHtmlEncoder encoder)
+        public virtual void WriteTo(TextWriter writer, IHtmlEncoder encoder)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (encoder == null)
+            {
+                throw new ArgumentNullException(nameof(encoder));
+            }
+
             _asyncAction(writer).GetAwaiter().GetResult();
         }
     }

src/Microsoft.AspNet.Mvc.Razor/IRazorViewFactory.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNet.Mvc.ViewEngines;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -19,6 +18,6 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <param name="page">The <see cref="IRazorPage"/> instance to execute.</param>
         /// <param name="isPartial">Determines if the view is to be executed as a partial.</param>
         /// <returns>A <see cref="IView"/> instance that renders the contents of the <paramref name="page"/></returns>
-        IView GetView([NotNull] IRazorViewEngine viewEngine, [NotNull] IRazorPage page, bool isPartial);
+        IView GetView(IRazorViewEngine viewEngine, IRazorPage page, bool isPartial);
     }
 }

src/Microsoft.AspNet.Mvc.Razor/ITagHelperInitializerOfT.cs

@@ -3,7 +3,6 @@
 
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -19,6 +18,6 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="helper">The <typeparamref name="TTagHelper"/> to initialize.</param>
         /// <param name="context">The <see cref="ViewContext"/> for the executing view.</param>
-        void Initialize([NotNull] TTagHelper helper, [NotNull] ViewContext context);
+        void Initialize(TTagHelper helper, ViewContext context);
     }
 }

src/Microsoft.AspNet.Mvc.Razor/Internal/MvcRazorMvcViewOptionsSetup.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.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
 
 namespace Microsoft.AspNet.Mvc.Razor.Internal
@@ -28,9 +27,19 @@ namespace Microsoft.AspNet.Mvc.Razor.Internal
         /// <param name="serviceProvider">The application's <see cref="IServiceProvider"/>.</param>
         /// <param name="options">The <see cref="MvcViewOptions"/> to configure.</param>
         public static void ConfigureMvc(
-            [NotNull] IServiceProvider serviceProvider,
-            [NotNull] MvcViewOptions options)
+            IServiceProvider serviceProvider,
+            MvcViewOptions options)
         {
+            if (serviceProvider == null)
+            {
+                throw new ArgumentNullException(nameof(serviceProvider));
+            }
+
+            if (options == null)
+            {
+                throw new ArgumentNullException(nameof(options));
+            }
+
             var razorViewEngine = serviceProvider.GetRequiredService<IRazorViewEngine>();
             options.ViewEngines.Add(razorViewEngine);
         }

src/Microsoft.AspNet.Mvc.Razor/Internal/RazorFileInfoCollectionGenerator.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.Runtime.CompilerServices;
 using System.Text;
 using Microsoft.AspNet.Mvc.Razor.Precompilation;
 using Microsoft.Dnx.Runtime;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Internal
 {
@@ -19,8 +19,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Internal
         /// </summary>
         /// <param name="fileInfoCollection">The <see cref="RazorFileInfoCollection"/>.</param>
         /// <returns></returns>
-        public static string GenerateCode([NotNull] RazorFileInfoCollection fileInfoCollection)
+        public static string GenerateCode(RazorFileInfoCollection fileInfoCollection)
         {
+            if (fileInfoCollection == null)
+            {
+                throw new ArgumentNullException(nameof(fileInfoCollection));
+            }
+
             var builder = new StringBuilder();
 
             builder.Append(

src/Microsoft.AspNet.Mvc.Razor/LanguageViewLocationExpander.cs

@@ -4,9 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
-using System.Linq;
 using System.Threading;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -45,8 +43,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public void PopulateValues([NotNull] ViewLocationExpanderContext context)
+        public void PopulateValues(ViewLocationExpanderContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             // Using CurrentUICulture so it loads the locale specific resources for the views.
 #if DNX451
             context.Values[ValueKey] = Thread.CurrentThread.CurrentUICulture.Name;
@@ -57,9 +60,19 @@ namespace Microsoft.AspNet.Mvc.Razor
 
         /// <inheritdoc />
         public virtual IEnumerable<string> ExpandViewLocations(
-            [NotNull] ViewLocationExpanderContext context,
-            [NotNull] IEnumerable<string> viewLocations)
+            ViewLocationExpanderContext context,
+            IEnumerable<string> viewLocations)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (viewLocations == null)
+            {
+                throw new ArgumentNullException(nameof(viewLocations));
+            }
+
             string value;
             context.Values.TryGetValue(ValueKey, out value);
 

src/Microsoft.AspNet.Mvc.Razor/Precompilation/GeneratorResultExtensions.cs

@@ -6,16 +6,31 @@ using System.Linq;
 using Microsoft.AspNet.Razor.CodeGenerators;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Precompilation
 {
     public static class GeneratorResultExtensions
     {
-        public static string GetMainClassName([NotNull] this GeneratorResults results,
-                                              [NotNull] IMvcRazorHost host,
-                                              [NotNull] SyntaxTree syntaxTree)
+        public static string GetMainClassName(
+            this GeneratorResults results,
+            IMvcRazorHost host,
+            SyntaxTree syntaxTree)
         {
+            if (results == null)
+            {
+                throw new ArgumentNullException(nameof(results));
+            }
+
+            if (host == null)
+            {
+                throw new ArgumentNullException(nameof(host));
+            }
+
+            if (syntaxTree == null)
+            {
+                throw new ArgumentNullException(nameof(syntaxTree));
+            }
+
             // The mainClass name should return directly from the generator results.
             var classes = syntaxTree.GetRoot().DescendantNodes().OfType<ClassDeclarationSyntax>();
             var mainClass = classes.FirstOrDefault(c =>

src/Microsoft.AspNet.Mvc.Razor/Precompilation/PrecompilationCacheEntry.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 Microsoft.CodeAnalysis;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Precompilation
 {
@@ -17,9 +17,20 @@ namespace Microsoft.AspNet.Mvc.Razor.Precompilation
         /// </summary>
         /// <param name="fileInfo">The <see cref="RazorFileInfo"/> of the file being cached.</param>
         /// <param name="syntaxTree">The <see cref="CodeAnalysis.SyntaxTree"/> to cache.</param>
-        public PrecompilationCacheEntry([NotNull] RazorFileInfo fileInfo,
-                                        [NotNull] SyntaxTree syntaxTree)
+        public PrecompilationCacheEntry(
+            RazorFileInfo fileInfo,
+            SyntaxTree syntaxTree)
         {
+            if (fileInfo == null)
+            {
+                throw new ArgumentNullException(nameof(fileInfo));
+            }
+
+            if (syntaxTree == null)
+            {
+                throw new ArgumentNullException(nameof(syntaxTree));
+            }
+
             FileInfo = fileInfo;
             SyntaxTree = syntaxTree;
         }
@@ -30,8 +41,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Precompilation
         /// <param name="diagnostics">The <see cref="IReadOnlyList{Diagnostic}"/> produced from parsing the Razor
         /// file. This does not contain <see cref="Diagnostic"/>s produced from compiling the parsed
         /// <see cref="CodeAnalysis.SyntaxTree"/>.</param>
-        public PrecompilationCacheEntry([NotNull] IReadOnlyList<Diagnostic> diagnostics)
+        public PrecompilationCacheEntry(IReadOnlyList<Diagnostic> diagnostics)
         {
+            if (diagnostics == null)
+            {
+                throw new ArgumentNullException(nameof(diagnostics));
+            }
+
             Diagnostics = diagnostics;
         }
 

src/Microsoft.AspNet.Mvc.Razor/Precompilation/RazorErrorExtensions.cs

@@ -5,14 +5,23 @@ using System;
 using Microsoft.AspNet.Razor;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Text;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Precompilation
 {
     public static class RazorErrorExtensions
     {
-        public static Diagnostic ToDiagnostics([NotNull] this RazorError error, [NotNull] string filePath)
+        public static Diagnostic ToDiagnostics(this RazorError error, string filePath)
         {
+            if (error == null)
+            {
+                throw new ArgumentNullException(nameof(error));
+            }
+
+            if (filePath == null)
+            {
+                throw new ArgumentNullException(nameof(filePath));
+            }
+
             var descriptor = new DiagnosticDescriptor(
                 id: "Razor",
                 title: "Razor parsing error",

src/Microsoft.AspNet.Mvc.Razor/Precompilation/RazorPreCompiler.cs

@@ -19,7 +19,6 @@ using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.Dnx.Compilation;
 using Microsoft.Dnx.Compilation.CSharp;
 using Microsoft.Framework.Caching.Memory;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor.Precompilation
 {
@@ -28,10 +27,25 @@ namespace Microsoft.AspNet.Mvc.Razor.Precompilation
         private const string CacheKeyDirectorySeparator = "/";
 
         public RazorPreCompiler(
-            [NotNull] BeforeCompileContext compileContext,
-            [NotNull] IFileProvider fileProvider,
-            [NotNull] IMemoryCache precompilationCache)
+            BeforeCompileContext compileContext,
+            IFileProvider fileProvider,
+            IMemoryCache precompilationCache)
         {
+            if (compileContext == null)
+            {
+                throw new ArgumentNullException(nameof(compileContext));
+            }
+
+            if (fileProvider == null)
+            {
+                throw new ArgumentNullException(nameof(fileProvider));
+            }
+
+            if (precompilationCache == null)
+            {
+                throw new ArgumentNullException(nameof(precompilationCache));
+            }
+
             CompileContext = compileContext;
             FileProvider = fileProvider;
             // There should always be a syntax tree even if there are no files (we generate one)
@@ -137,9 +151,19 @@ namespace Microsoft.AspNet.Mvc.Razor.Precompilation
         }
 
         protected virtual RazorFileInfoCollection GeneratePrecompiledAssembly(
-            [NotNull] IEnumerable<SyntaxTree> syntaxTrees,
-            [NotNull] IEnumerable<RazorFileInfo> razorFileInfos)
+            IEnumerable<SyntaxTree> syntaxTrees,
+            IEnumerable<RazorFileInfo> razorFileInfos)
         {
+            if (syntaxTrees == null)
+            {
+                throw new ArgumentNullException(nameof(syntaxTrees));
+            }
+
+            if (razorFileInfos == null)
+            {
+                throw new ArgumentNullException(nameof(razorFileInfos));
+            }
+
             var resourcePrefix = string.Join(".", CompileContext.Compilation.AssemblyName,
                                                   nameof(RazorPreCompiler),
                                                   Path.GetRandomFileName());
@@ -241,8 +265,13 @@ namespace Microsoft.AspNet.Mvc.Razor.Precompilation
             }
         }
 
-        protected virtual PrecompilationCacheEntry GetCacheEntry([NotNull] RelativeFileInfo fileInfo)
+        protected virtual PrecompilationCacheEntry GetCacheEntry(RelativeFileInfo fileInfo)
         {
+            if (fileInfo == null)
+            {
+                throw new ArgumentNullException(nameof(fileInfo));
+            }
+
             using (var stream = fileInfo.FileInfo.CreateReadStream())
             {
                 var host = GetRazorHost();

src/Microsoft.AspNet.Mvc.Razor/RazorPage.cs

@@ -14,12 +14,10 @@ using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Mvc.Actions;
 using Microsoft.AspNet.Mvc.Razor.Internal;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.AspNet.Mvc.Routing;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.PageExecutionInstrumentation;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.Razor
@@ -227,8 +225,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// All writes to the <see cref="Output"/> or <see cref="ViewContext.Writer"/> after calling this method will
         /// be buffered until <see cref="EndTagHelperWritingScope"/> is called.
         /// </remarks>
-        public void StartTagHelperWritingScope([NotNull] TextWriter writer)
+        public void StartTagHelperWritingScope(TextWriter writer)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
             // If there isn't a base writer take the ViewContext.Writer
             if (_originalWriter == null)
             {
@@ -297,8 +300,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <returns>
         /// A <see cref="Task"/> that on completion writes the <paramref name="tagHelperExecutionContext"/> content.
         /// </returns>
-        public Task WriteTagHelperAsync([NotNull] TagHelperExecutionContext tagHelperExecutionContext)
+        public Task WriteTagHelperAsync(TagHelperExecutionContext tagHelperExecutionContext)
         {
+            if (tagHelperExecutionContext == null)
+            {
+                throw new ArgumentNullException(nameof(tagHelperExecutionContext));
+            }
+
             return WriteTagHelperToAsync(Output, tagHelperExecutionContext);
         }
 
@@ -313,9 +321,19 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// to the <paramref name="writer"/>.
         /// </returns>
         public async Task WriteTagHelperToAsync(
-            [NotNull] TextWriter writer,
-            [NotNull] TagHelperExecutionContext tagHelperExecutionContext)
+            TextWriter writer,
+            TagHelperExecutionContext tagHelperExecutionContext)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (tagHelperExecutionContext == null)
+            {
+                throw new ArgumentNullException(nameof(tagHelperExecutionContext));
+            }
+
             var tagHelperOutput = tagHelperExecutionContext.Output;
             var isTagNameNullOrWhitespace = string.IsNullOrWhiteSpace(tagHelperOutput.TagName);
 
@@ -395,8 +413,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// For all other types, the encoded result of <see cref="object.ToString"/> is written to the
         /// <paramref name="writer"/>.
         /// </remarks>
-        public virtual void WriteTo([NotNull] TextWriter writer, object value)
+        public virtual void WriteTo(TextWriter writer, object value)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
             WriteTo(writer, HtmlEncoder, value, escapeQuotes: false);
         }
 
@@ -417,11 +440,21 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <paramref name="writer"/>.
         /// </remarks>
         public static void WriteTo(
-            [NotNull] TextWriter writer,
-            [NotNull] IHtmlEncoder encoder,
+            TextWriter writer,
+            IHtmlEncoder encoder,
             object value,
             bool escapeQuotes)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (encoder == null)
+            {
+                throw new ArgumentNullException(nameof(encoder));
+            }
+
             if (value == null || value == HtmlString.Empty)
             {
                 return;
@@ -475,8 +508,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="writer">The <see cref="TextWriter"/> instance to write to.</param>
         /// <param name="value">The <see cref="string"/> to write.</param>
-        public virtual void WriteTo([NotNull] TextWriter writer, string value)
+        public virtual void WriteTo(TextWriter writer, string value)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
             WriteTo(writer, HtmlEncoder, value);
         }
 
@@ -502,8 +540,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="writer">The <see cref="TextWriter"/> instance to write to.</param>
         /// <param name="value">The <see cref="object"/> to write.</param>
-        public virtual void WriteLiteralTo([NotNull] TextWriter writer, object value)
+        public virtual void WriteLiteralTo(TextWriter writer, object value)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
             if (value != null)
             {
                 WriteLiteralTo(writer, value.ToString());
@@ -515,8 +558,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="writer">The <see cref="TextWriter"/> instance to write to.</param>
         /// <param name="value">The <see cref="string"/> to write.</param>
-        public virtual void WriteLiteralTo([NotNull] TextWriter writer, string value)
+        public virtual void WriteLiteralTo(TextWriter writer, string value)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
             if (!string.IsNullOrEmpty(value))
             {
                 writer.Write(value);
@@ -525,20 +573,45 @@ namespace Microsoft.AspNet.Mvc.Razor
 
         public virtual void WriteAttribute(
             string name,
-            [NotNull] PositionTagged<string> prefix,
-            [NotNull] PositionTagged<string> suffix,
+            PositionTagged<string> prefix,
+            PositionTagged<string> suffix,
             params AttributeValue[] values)
         {
+            if (prefix == null)
+            {
+                throw new ArgumentNullException(nameof(prefix));
+            }
+
+            if (suffix == null)
+            {
+                throw new ArgumentNullException(nameof(suffix));
+            }
+
             WriteAttributeTo(Output, name, prefix, suffix, values);
         }
 
         public virtual void WriteAttributeTo(
-            [NotNull] TextWriter writer,
+            TextWriter writer,
             string name,
-            [NotNull] PositionTagged<string> prefix,
-            [NotNull] PositionTagged<string> suffix,
+            PositionTagged<string> prefix,
+            PositionTagged<string> suffix,
             params AttributeValue[] values)
         {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            if (prefix == null)
+            {
+                throw new ArgumentNullException(nameof(prefix));
+            }
+
+            if (suffix == null)
+            {
+                throw new ArgumentNullException(nameof(suffix));
+            }
+
             if (values.Length == 0)
             {
                 // Explicitly empty attribute, so write the prefix
@@ -647,8 +720,13 @@ namespace Microsoft.AspNet.Mvc.Razor
             }
         }
 
-        public virtual string Href([NotNull] string contentPath)
+        public virtual string Href(string contentPath)
         {
+            if (contentPath == null)
+            {
+                throw new ArgumentNullException(nameof(contentPath));
+            }
+
             if (_urlHelper == null)
             {
                 _urlHelper = Context.RequestServices.GetRequiredService<IUrlHelper>();
@@ -725,8 +803,18 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="name">The name of the section to create.</param>
         /// <param name="section">The <see cref="RenderAsyncDelegate"/> to execute when rendering the section.</param>
-        public void DefineSection([NotNull] string name, [NotNull] RenderAsyncDelegate section)
+        public void DefineSection(string name, RenderAsyncDelegate section)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
+            if (section == null)
+            {
+                throw new ArgumentNullException(nameof(section));
+            }
+
             if (SectionWriters.ContainsKey(name))
             {
                 throw new InvalidOperationException(Resources.FormatSectionAlreadyDefined(name));
@@ -734,8 +822,13 @@ namespace Microsoft.AspNet.Mvc.Razor
             SectionWriters[name] = section;
         }
 
-        public bool IsSectionDefined([NotNull] string name)
+        public bool IsSectionDefined(string name)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             EnsureMethodCanBeInvoked(nameof(IsSectionDefined));
             return PreviousSectionWriters.ContainsKey(name);
         }
@@ -749,8 +842,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <remarks>The method writes to the <see cref="Output"/> and the value returned is a token
         /// value that allows the Write (produced due to @RenderSection(..)) to succeed. However the
         /// value does not represent the rendered content.</remarks>
-        public HtmlString RenderSection([NotNull] string name)
+        public HtmlString RenderSection(string name)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             return RenderSection(name, required: true);
         }
 
@@ -764,8 +862,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <remarks>The method writes to the <see cref="Output"/> and the value returned is a token
         /// value that allows the Write (produced due to @RenderSection(..)) to succeed. However the
         /// value does not represent the rendered content.</remarks>
-        public HtmlString RenderSection([NotNull] string name, bool required)
+        public HtmlString RenderSection(string name, bool required)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             EnsureMethodCanBeInvoked(nameof(RenderSection));
 
             var task = RenderSectionAsyncCore(name, required);
@@ -781,8 +884,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <remarks>The method writes to the <see cref="Output"/> and the value returned is a token
         /// value that allows the Write (produced due to @RenderSection(..)) to succeed. However the
         /// value does not represent the rendered content.</remarks>
-        public Task<HtmlString> RenderSectionAsync([NotNull] string name)
+        public Task<HtmlString> RenderSectionAsync(string name)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             return RenderSectionAsync(name, required: true);
         }
 
@@ -797,8 +905,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// value does not represent the rendered content.</remarks>
         /// <exception cref="InvalidOperationException">if <paramref name="required"/> is <c>true</c> and the section
         /// was not registered using the <c>@section</c> in the Razor page.</exception>
-        public Task<HtmlString> RenderSectionAsync([NotNull] string name, bool required)
+        public Task<HtmlString> RenderSectionAsync(string name, bool required)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
             EnsureMethodCanBeInvoked(nameof(RenderSectionAsync));
             return RenderSectionAsyncCore(name, required);
         }

src/Microsoft.AspNet.Mvc.Razor/RazorPageActivator.cs

@@ -32,8 +32,18 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public void Activate([NotNull] IRazorPage page, [NotNull] ViewContext context)
+        public void Activate(IRazorPage page, ViewContext context)
         {
+            if (page == null)
+            {
+                throw new ArgumentNullException(nameof(page));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             var activationInfo = _activationInfo.GetOrAdd(page.GetType(),
                                                           CreateViewActivationInfo);
 

src/Microsoft.AspNet.Mvc.Razor/RazorPageOfT.cs

@@ -8,7 +8,6 @@ using Microsoft.AspNet.Mvc.Razor.Internal;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.Framework.DependencyInjection;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -41,8 +40,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <remarks>
         /// Compiler normally infers <typeparamref name="TValue"/> from the given <paramref name="expression"/>.
         /// </remarks>
-        public ModelExpression CreateModelExpression<TValue>([NotNull] Expression<Func<TModel, TValue>> expression)
+        public ModelExpression CreateModelExpression<TValue>(Expression<Func<TModel, TValue>> expression)
         {
+            if (expression == null)
+            {
+                throw new ArgumentNullException(nameof(expression));
+            }
+
             if (_provider == null)
             {
                 _provider = Context.RequestServices.GetRequiredService<IModelMetadataProvider>();

src/Microsoft.AspNet.Mvc.Razor/RazorPageResult.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.Razor
 {
@@ -16,8 +16,18 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="name">The name of the page that was located.</param>
         /// <param name="page">The located <see cref="IRazorPage"/>.</param>
-        public RazorPageResult([NotNull] string name, [NotNull] IRazorPage page)
+        public RazorPageResult(string name, IRazorPage page)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
+            if (page == null)
+            {
+                throw new ArgumentNullException(nameof(page));
+            }
+
             Name = name;
             Page = page;
         }
@@ -27,8 +37,18 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="name">The name of the page that was located.</param>
         /// <param name="searchedLocations">The locations that were searched.</param>
-        public RazorPageResult([NotNull] string name, [NotNull] IEnumerable<string> searchedLocations)
+        public RazorPageResult(string name, IEnumerable<string> searchedLocations)
         {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
+            if (searchedLocations == null)
+            {
+                throw new ArgumentNullException(nameof(searchedLocations));
+            }
+
             Name = name;
             SearchedLocations = searchedLocations;
         }

src/Microsoft.AspNet.Mvc.Razor/RazorTextWriter.cs

@@ -6,9 +6,7 @@ using System.IO;
 using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Html.Abstractions;
-using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.Razor
@@ -66,8 +64,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <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));
@@ -110,8 +113,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <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));
+            }
+
             if (index < 0)
             {
                 throw new ArgumentOutOfRangeException(nameof(index));

src/Microsoft.AspNet.Mvc.Razor/RazorView.cs

@@ -10,7 +10,6 @@ using Microsoft.AspNet.Http.Features;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.PageExecutionInstrumentation;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.Razor
@@ -75,8 +74,18 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public virtual async Task RenderAsync([NotNull] ViewContext context)
+        public virtual async Task RenderAsync(ViewContext context)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             _pageExecutionFeature = context.HttpContext.Features.Get<IPageExecutionListenerFeature>();
 
             // Partials don't execute _ViewStart pages, but may execute Layout pages if the Layout property

src/Microsoft.AspNet.Mvc.Razor/RazorViewEngine.cs

@@ -7,9 +7,7 @@ using System.Diagnostics;
 using System.Globalization;
 using System.Linq;
 using Microsoft.AspNet.Mvc.Actions;
-using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.OptionsModel;
 
 namespace Microsoft.AspNet.Mvc.Razor
@@ -101,9 +99,14 @@ namespace Microsoft.AspNet.Mvc.Razor
 
         /// <inheritdoc />
         public ViewEngineResult FindView(
-            [NotNull] ActionContext context,
+            ActionContext context,
             string viewName)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             if (string.IsNullOrEmpty(viewName))
             {
                 throw new ArgumentException(Resources.ArgumentCannotBeNullOrEmpty, nameof(viewName));
@@ -115,9 +118,14 @@ namespace Microsoft.AspNet.Mvc.Razor
 
         /// <inheritdoc />
         public ViewEngineResult FindPartialView(
-            [NotNull] ActionContext context,
+            ActionContext context,
             string partialViewName)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             if (string.IsNullOrEmpty(partialViewName))
             {
                 throw new ArgumentException(Resources.ArgumentCannotBeNullOrEmpty, nameof(partialViewName));
@@ -129,9 +137,14 @@ namespace Microsoft.AspNet.Mvc.Razor
 
         /// <inheritdoc />
         public RazorPageResult FindPage(
-            [NotNull] ActionContext context,
+            ActionContext context,
             string pageName)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             if (string.IsNullOrEmpty(pageName))
             {
                 throw new ArgumentException(Resources.ArgumentCannotBeNullOrEmpty, nameof(pageName));
@@ -154,9 +167,19 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// consistently cased results.
         /// </remarks>
         public static string GetNormalizedRouteValue(
-            [NotNull] ActionContext context,
-            [NotNull] string key)
+            ActionContext context,
+            string key)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (key == null)
+            {
+                throw new ArgumentNullException(nameof(key));
+            }
+
             object routeValue;
             if (!context.RouteData.Values.TryGetValue(key, out routeValue))
             {

src/Microsoft.AspNet.Mvc.Razor/RazorViewFactory.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.ViewEngines;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.Razor
@@ -23,7 +23,8 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <param name="pageActivator">The <see cref="IRazorPageActivator"/> used to activate pages.</param>
         /// <param name="viewStartProvider">The <see cref="IViewStartProvider"/> used for discovery of _ViewStart
         /// pages</param>
-        public RazorViewFactory(IRazorPageActivator pageActivator,
+        public RazorViewFactory(
+            IRazorPageActivator pageActivator,
             IViewStartProvider viewStartProvider,
             IHtmlEncoder htmlEncoder)
         {
@@ -33,10 +34,21 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public IView GetView([NotNull] IRazorViewEngine viewEngine,
-                             [NotNull] IRazorPage page,
+        public IView GetView(
+            IRazorViewEngine viewEngine,
+            IRazorPage page,
             bool isPartial)
         {
+            if (viewEngine == null)
+            {
+                throw new ArgumentNullException(nameof(viewEngine));
+            }
+
+            if (page == null)
+            {
+                throw new ArgumentNullException(nameof(page));
+            }
+
             var razorView = new RazorView(
                 viewEngine,
                 _pageActivator,

src/Microsoft.AspNet.Mvc.Razor/TagHelperContentWrapperTextWriter.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 System.Text;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -17,7 +17,7 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// Initializes a new instance of the <see cref="TagHelperContentWrapperTextWriter"/> class.
         /// </summary>
         /// <param name="encoding">The <see cref="Encoding"/> in which output is written.</param>
-        public TagHelperContentWrapperTextWriter([NotNull] Encoding encoding)
+        public TagHelperContentWrapperTextWriter(Encoding encoding)
             : this(encoding, new DefaultTagHelperContent())
         {
         }
@@ -27,8 +27,18 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// </summary>
         /// <param name="encoding">The <see cref="Encoding"/> in which output is written.</param>
         /// <param name="content">The <see cref="TagHelperContent"/> to write to.</param>
-        public TagHelperContentWrapperTextWriter([NotNull] Encoding encoding, [NotNull] TagHelperContent content)
+        public TagHelperContentWrapperTextWriter(Encoding encoding, TagHelperContent content)
         {
+            if (encoding == null)
+            {
+                throw new ArgumentNullException(nameof(encoding));
+            }
+
+            if (content == null)
+            {
+                throw new ArgumentNullException(nameof(content));
+            }
+
             Content = content;
             Encoding = encoding;
         }

src/Microsoft.AspNet.Mvc.Razor/TagHelperInitializerOfT.cs

@@ -4,7 +4,6 @@
 using System;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -18,14 +17,29 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// Creates a <see cref="TagHelperInitializer{TTagHelper}"/>.
         /// </summary>
         /// <param name="action">The initialization delegate.</param>
-        public TagHelperInitializer([NotNull] Action<TTagHelper, ViewContext> action)
+        public TagHelperInitializer(Action<TTagHelper, ViewContext> action)
         {
+            if (action == null)
+            {
+                throw new ArgumentNullException(nameof(action));
+            }
+
             _initializeDelegate = action;
         }
 
         /// <inheritdoc />
-        public void Initialize([NotNull] TTagHelper helper, [NotNull] ViewContext context)
+        public void Initialize(TTagHelper helper, ViewContext context)
         {
+            if (helper == null)
+            {
+                throw new ArgumentNullException(nameof(helper));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             _initializeDelegate(helper, context);
         }
     }

src/Microsoft.AspNet.Mvc.Razor/ViewLocationCacheResult.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;
@@ -21,10 +21,20 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <param name="searchedLocations">Locations that were searched
         /// in addition to <paramref name="foundLocation"/>.</param>
         public ViewLocationCacheResult(
-            [NotNull] string foundLocation,
-            [NotNull] IEnumerable<string> searchedLocations)
+            string foundLocation,
+            IEnumerable<string> searchedLocations)
             : this(searchedLocations)
         {
+            if (foundLocation == null)
+            {
+                throw new ArgumentNullException(nameof(foundLocation));
+            }
+
+            if (searchedLocations == null)
+            {
+                throw new ArgumentNullException(nameof(searchedLocations));
+            }
+
             ViewLocation = foundLocation;
             SearchedLocations = searchedLocations;
             IsFoundResult = true;
@@ -35,8 +45,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// failed view lookup.
         /// </summary>
         /// <param name="searchedLocations">Locations that were searched.</param>
-        public ViewLocationCacheResult([NotNull] IEnumerable<string> searchedLocations)
+        public ViewLocationCacheResult(IEnumerable<string> searchedLocations)
         {
+            if (searchedLocations == null)
+            {
+                throw new ArgumentNullException(nameof(searchedLocations));
+            }
+
             SearchedLocations = searchedLocations;
             ViewLocation = null;
             IsFoundResult = false;

src/Microsoft.AspNet.Mvc.Razor/ViewLocationExpanderContext.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 System.Collections.Generic;
-using Microsoft.AspNet.Mvc.Actions;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -18,10 +17,20 @@ namespace Microsoft.AspNet.Mvc.Razor
         /// <param name="actionContext">The <see cref="Mvc.ActionContext"/> for the current executing action.</param>
         /// <param name="viewName">The view name.</param>
         /// <param name="isPartial">Determines if the view being discovered is a partial.</param>
-        public ViewLocationExpanderContext([NotNull] ActionContext actionContext,
-                                           [NotNull] string viewName,
+        public ViewLocationExpanderContext(ActionContext actionContext,
+                                           string viewName,
                                            bool isPartial)
         {
+            if (actionContext == null)
+            {
+                throw new ArgumentNullException(nameof(actionContext));
+            }
+
+            if (viewName == null)
+            {
+                throw new ArgumentNullException(nameof(viewName));
+            }
+
             ActionContext = actionContext;
             ViewName = viewName;
             IsPartial = isPartial;

src/Microsoft.AspNet.Mvc.Razor/ViewStartProvider.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -19,8 +18,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public IEnumerable<IRazorPage> GetViewStartPages([NotNull] string path)
+        public IEnumerable<IRazorPage> GetViewStartPages(string path)
         {
+            if (path == null)
+            {
+                throw new ArgumentNullException(nameof(path));
+            }
+
             var viewStartLocations = ViewHierarchyUtility.GetViewStartLocations(path);
             var viewStarts = viewStartLocations.Select(_pageFactory.CreateInstance)
                                                .Where(p => p != null)

src/Microsoft.AspNet.Mvc.Razor/VirtualPathRazorPageFactory.cs

@@ -3,7 +3,6 @@
 
 using System;
 using Microsoft.AspNet.Mvc.Razor.Compilation;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.Razor
 {
@@ -47,8 +46,13 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
         /// <inheritdoc />
-        public IRazorPage CreateInstance([NotNull] string relativePath)
+        public IRazorPage CreateInstance(string relativePath)
         {
+            if (relativePath == null)
+            {
+                throw new ArgumentNullException(nameof(relativePath));
+            }
+
             if (relativePath.StartsWith("~/", StringComparison.Ordinal))
             {
                 // For tilde slash paths, drop the leading ~ to make it work with the underlying IFileProvider.

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

@@ -14,7 +14,6 @@
     "Microsoft.AspNet.Razor.Runtime.Precompilation":  "4.0.0-*",
     "Microsoft.AspNet.PageExecutionInstrumentation.Interfaces": "1.0.0-*",
     "Microsoft.Framework.HashCodeCombiner.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" },
     "Microsoft.Dnx.Compilation.CSharp.Common": "1.0.0-*",

src/Microsoft.AspNet.Mvc.TagHelpers/Internal/AttributeMatcher.cs

@@ -4,9 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Reflection;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
 {
@@ -24,9 +22,19 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         /// <param name="modeInfos">The modes and their required attributes.</param>
         /// <returns>The <see cref="ModeMatchResult{TMode}"/>.</returns>
         public static ModeMatchResult<TMode> DetermineMode<TMode>(
-            [NotNull] TagHelperContext context,
-            [NotNull] IEnumerable<ModeAttributes<TMode>> modeInfos)
+            TagHelperContext context,
+            IEnumerable<ModeAttributes<TMode>> modeInfos)
         {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (modeInfos == null)
+            {
+                throw new ArgumentNullException(nameof(modeInfos));
+            }
+
             // true == full match, false == partial match
             var matchedAttributes = new Dictionary<string, bool>(StringComparer.OrdinalIgnoreCase);
             var result = new ModeMatchResult<TMode>();

src/Microsoft.AspNet.Mvc.TagHelpers/Internal/FileProviderGlobbingDirectory.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.Collections.Generic;
 using Microsoft.AspNet.FileProviders;
 using Microsoft.Framework.FileSystemGlobbing.Abstractions;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
 {
@@ -17,10 +17,15 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         private readonly bool _isRoot;
 
         public FileProviderGlobbingDirectory(
-            [NotNull] IFileProvider fileProvider,
+            IFileProvider fileProvider,
             IFileInfo fileInfo,
             FileProviderGlobbingDirectory parent)
         {
+            if (fileProvider == null)
+            {
+                throw new ArgumentNullException(nameof(fileProvider));
+            }
+
             _fileProvider = fileProvider;
             _fileInfo = fileInfo;
             _parent = parent;

src/Microsoft.AspNet.Mvc.TagHelpers/Internal/FileProviderGlobbingFile.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 Microsoft.AspNet.FileProviders;
 using Microsoft.Framework.FileSystemGlobbing.Abstractions;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
 {
@@ -11,8 +11,18 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
     {
         private const char DirectorySeparatorChar = '/';
 
-        public FileProviderGlobbingFile([NotNull] IFileInfo fileInfo, [NotNull] DirectoryInfoBase parent)
+        public FileProviderGlobbingFile(IFileInfo fileInfo, DirectoryInfoBase parent)
         {
+            if (fileInfo == null)
+            {
+                throw new ArgumentNullException(nameof(fileInfo));
+            }
+
+            if (parent == null)
+            {
+                throw new ArgumentNullException(nameof(parent));
+            }
+
             Name = fileInfo.Name;
             ParentDirectory = parent;
             FullName = ParentDirectory.FullName + DirectorySeparatorChar + Name;

src/Microsoft.AspNet.Mvc.TagHelpers/Internal/FileVersionProvider.cs

@@ -7,7 +7,6 @@ using Microsoft.AspNet.FileProviders;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.WebUtilities;
 using Microsoft.Framework.Caching.Memory;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
 {
@@ -28,10 +27,20 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         /// <param name="applicationName">Name of the application.</param>
         /// <param name="cache"><see cref="IMemoryCache"/> where versioned urls of files are cached.</param>
         public FileVersionProvider(
-            [NotNull] IFileProvider fileProvider,
-            [NotNull] IMemoryCache cache,
-            [NotNull] PathString requestPathBase)
+            IFileProvider fileProvider,
+            IMemoryCache cache,
+            PathString requestPathBase)
         {
+            if (fileProvider == null)
+            {
+                throw new ArgumentNullException(nameof(fileProvider));
+            }
+
+            if (cache == null)
+            {
+                throw new ArgumentNullException(nameof(cache));
+            }
+
             _fileProvider = fileProvider;
             _cache = cache;
             _requestPathBase = requestPathBase;
@@ -45,8 +54,13 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         /// <remarks>
         /// The version query string is appended as with the key "v".
         /// </remarks>
-        public string AddFileVersionToPath([NotNull] string path)
+        public string AddFileVersionToPath(string path)
         {
+            if (path == null)
+            {
+                throw new ArgumentNullException(nameof(path));
+            }
+
             var resolvedPath = path;
 
             var queryStringOrFragmentStartIndex = path.IndexOfAny(new char[] { '?', '#' });

src/Microsoft.AspNet.Mvc.TagHelpers/Internal/GlobbingUrlBuilder.cs

@@ -6,10 +6,8 @@ using System.Collections.Generic;
 using System.Linq;
 using Microsoft.AspNet.FileProviders;
 using Microsoft.AspNet.Http;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.Framework.Caching.Memory;
 using Microsoft.Framework.FileSystemGlobbing;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
 {
@@ -37,8 +35,13 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         /// <param name="fileProvider">The file provider.</param>
         /// <param name="cache">The cache.</param>
         /// <param name="requestPathBase">The request path base.</param>
-        public GlobbingUrlBuilder([NotNull] IFileProvider fileProvider, IMemoryCache cache, PathString requestPathBase)
+        public GlobbingUrlBuilder(IFileProvider fileProvider, IMemoryCache cache, PathString requestPathBase)
         {
+            if (fileProvider == null)
+            {
+                throw new ArgumentNullException(nameof(fileProvider));
+            }
+
             FileProvider = fileProvider;
             Cache = cache;
             RequestPathBase = requestPathBase;

src/Microsoft.AspNet.Mvc.TagHelpers/Internal/ModeMatchResult.cs

@@ -6,7 +6,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
@@ -41,12 +40,22 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         /// <param name="uniqueId">The value of <see cref="TagHelperContext.UniqueId"/>.</param>
         /// <param name="viewPath">The path to the view the <see cref="ITagHelper"/> is on.</param>
         public void LogDetails<TTagHelper>(
-            [NotNull] ILogger logger,
-            [NotNull] TTagHelper tagHelper,
+            ILogger logger,
+            TTagHelper tagHelper,
             string uniqueId,
             string viewPath)
             where TTagHelper : ITagHelper
         {
+            if (logger == null)
+            {
+                throw new ArgumentNullException(nameof(logger));
+            }
+
+            if (tagHelper == null)
+            {
+                throw new ArgumentNullException(nameof(tagHelper));
+            }
+
             if (logger.IsEnabled(LogLevel.Warning) && PartiallyMatchedAttributes.Any())
             {
                 // Build the list of partial matches that contain attributes not appearing in at least one full match

src/Microsoft.AspNet.Mvc.TagHelpers/Internal/PartialModeMatchLogValuesOfT.cs

@@ -4,8 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.Logging;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
@@ -29,8 +27,13 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         public PartialModeMatchLogValues(
             string uniqueId,
             string viewPath,
-            [NotNull] IEnumerable<ModeMatchAttributes<TMode>> partialMatches)
+            IEnumerable<ModeMatchAttributes<TMode>> partialMatches)
         {
+            if (partialMatches == null)
+            {
+                throw new ArgumentNullException(nameof(partialMatches));
+            }
+
             _uniqueId = uniqueId;
             _viewPath = viewPath;
             _partialMatches = partialMatches;

src/Microsoft.AspNet.Mvc.TagHelpers/TagHelperContentExtensions.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.Text;
 using Microsoft.AspNet.Mvc.Razor;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.Framework.Internal;
 using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers
@@ -29,11 +29,26 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         /// is written to the <paramref name="content"/>.
         /// </remarks>
         public static TagHelperContent Append(
-            [NotNull] this TagHelperContent content,
-            [NotNull] IHtmlEncoder encoder,
-            [NotNull] Encoding encoding,
+            this TagHelperContent content,
+            IHtmlEncoder encoder,
+            Encoding encoding,
             object value)
         {
+            if (content == null)
+            {
+                throw new ArgumentNullException(nameof(content));
+            }
+
+            if (encoder == null)
+            {
+                throw new ArgumentNullException(nameof(encoder));
+            }
+
+            if (encoding == null)
+            {
+                throw new ArgumentNullException(nameof(encoding));
+            }
+
             using (var writer = new TagHelperContentWrapperTextWriter(encoding, content))
             {
                 RazorPage.WriteTo(writer, encoder, value, escapeQuotes: true);

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

@@ -6,7 +6,6 @@ using System.Collections.Generic;
 using System.Linq;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Mvc.TagHelpers
 {
@@ -35,10 +34,25 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         /// attribute order not being maintained.
         /// </para></remarks>
         public static void CopyHtmlAttribute(
-            [NotNull] this TagHelperOutput tagHelperOutput,
-            [NotNull] string attributeName,
-            [NotNull] TagHelperContext context)
+            this TagHelperOutput tagHelperOutput,
+            string attributeName,
+            TagHelperContext context)
         {
+            if (tagHelperOutput == null)
+            {
+                throw new ArgumentNullException(nameof(tagHelperOutput));
+            }
+
+            if (attributeName == null)
+            {
+                throw new ArgumentNullException(nameof(attributeName));
+            }
+
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
             if (!tagHelperOutput.Attributes.ContainsName(attributeName))
             {
                 var copiedAttribute = false;
@@ -77,9 +91,19 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         /// <remarks>Existing <see cref="TagHelperOutput.Attributes"/> on the given <paramref name="tagHelperOutput"/>
         /// are not overridden; "class" attributes are merged with spaces.</remarks>
         public static void MergeAttributes(
-            [NotNull] this TagHelperOutput tagHelperOutput,
-            [NotNull] TagBuilder tagBuilder)
+            this TagHelperOutput tagHelperOutput,
+            TagBuilder tagBuilder)
         {
+            if (tagHelperOutput == null)
+            {
+                throw new ArgumentNullException(nameof(tagHelperOutput));
+            }
+
+            if (tagBuilder == null)
+            {
+                throw new ArgumentNullException(nameof(tagBuilder));
+            }
+
             foreach (var attribute in tagBuilder.Attributes)
             {
                 if (!tagHelperOutput.Attributes.ContainsName(attribute.Key))
@@ -109,9 +133,19 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         /// <param name="tagHelperOutput">The <see cref="TagHelperOutput"/> this method extends.</param>
         /// <param name="attributes">Attributes to remove.</param>
         public static void RemoveRange(
-            [NotNull] this TagHelperOutput tagHelperOutput,
-            [NotNull] IEnumerable<TagHelperAttribute> attributes)
+            this TagHelperOutput tagHelperOutput,
+            IEnumerable<TagHelperAttribute> attributes)
         {
+            if (tagHelperOutput == null)
+            {
+                throw new ArgumentNullException(nameof(tagHelperOutput));
+            }
+
+            if (attributes == null)
+            {
+                throw new ArgumentNullException(nameof(attributes));
+            }
+
             foreach (var attribute in attributes.ToArray())
             {
                 tagHelperOutput.Attributes.Remove(attribute);

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

@@ -13,8 +13,7 @@
     "Microsoft.Framework.Caching.Memory": "1.0.0-*",
     "Microsoft.Framework.FileSystemGlobbing": "1.0.0-*",
     "Microsoft.Framework.Logging.Abstractions": { "version": "1.0.0-*", "type": "build" },
-    "Microsoft.Framework.PropertyHelper.Sources": { "version": "1.0.0-*", "type": "build" },
-    "Microsoft.Framework.NotNullAttribute.Sources": { "version": "1.0.0-*", "type": "build" }
+    "Microsoft.Framework.PropertyHelper.Sources": { "version": "1.0.0-*", "type": "build" }
   },
   "frameworks": {
     "dnx451": { },

test/Microsoft.AspNet.Mvc.Razor.Host.Test/MvcRazorHostTest.cs

@@ -55,14 +55,15 @@ namespace Microsoft.AspNet.Mvc.Razor
             // Arrange
             var rootedAppPath = $"{rootPrefix}SomeComputer/Location/Project/";
             var rootedFilePath = $"{rootPrefix}SomeComputer/Location/Project/src/file.cshtml";
+            var chunkTreeCache = new DefaultChunkTreeCache(new TestFileProvider());
             var host = new MvcRazorHost(
-                chunkTreeCache: null,
+                chunkTreeCache,
                 pathNormalizer: new DesignTimeRazorPathNormalizer(rootedAppPath));
             var parser = new RazorParser(
                 host.CodeLanguage.CreateCodeParser(),
                 host.CreateMarkupParser(),
                 tagHelperDescriptorResolver: null);
-            var chunkInheritanceUtility = new PathValidatingChunkInheritanceUtility(host);
+            var chunkInheritanceUtility = new PathValidatingChunkInheritanceUtility(host, chunkTreeCache);
             host.ChunkInheritanceUtility = chunkInheritanceUtility;
 
             // Act
@@ -80,10 +81,11 @@ namespace Microsoft.AspNet.Mvc.Razor
             // Arrange
             var rootedAppPath = $"{rootPrefix}SomeComputer/Location/Project/";
             var rootedFilePath = $"{rootPrefix}SomeComputer/Location/Project/src/file.cshtml";
+            var chunkTreeCache = new DefaultChunkTreeCache(new TestFileProvider());
             var host = new MvcRazorHost(
-                chunkTreeCache: null,
+                chunkTreeCache,
                 pathNormalizer: new DesignTimeRazorPathNormalizer(rootedAppPath));
-            var chunkInheritanceUtility = new PathValidatingChunkInheritanceUtility(host);
+            var chunkInheritanceUtility = new PathValidatingChunkInheritanceUtility(host, chunkTreeCache);
             var codeGeneratorContext = new CodeGeneratorContext(
                 new ChunkGeneratorContext(
                     host,
@@ -371,7 +373,8 @@ namespace Microsoft.AspNet.Mvc.Razor
             RunDesignTimeTest(host, "Model", expectedLineMappings);
         }
 
-        private static void RunRuntimeTest(MvcRazorHost host,
+        private static void RunRuntimeTest(
+            MvcRazorHost host,
             string testName)
         {
             var inputFile = "TestFiles/Input/" + testName + ".cshtml";
@@ -396,7 +399,8 @@ namespace Microsoft.AspNet.Mvc.Razor
 #endif
         }
 
-        private static void RunDesignTimeTest(MvcRazorHost host,
+        private static void RunDesignTimeTest(
+            MvcRazorHost host,
             string testName,
             IEnumerable<LineMapping> expectedLineMappings)
         {
@@ -457,7 +461,8 @@ namespace Microsoft.AspNet.Mvc.Razor
 #endif
         }
 
-        private static LineMapping BuildLineMapping(int documentAbsoluteIndex,
+        private static LineMapping BuildLineMapping(
+            int documentAbsoluteIndex,
             int documentLineIndex,
             int documentCharacterIndex,
             int generatedAbsoluteIndex,
@@ -479,14 +484,14 @@ namespace Microsoft.AspNet.Mvc.Razor
 
         private class PathValidatingChunkInheritanceUtility : ChunkInheritanceUtility
         {
-            public PathValidatingChunkInheritanceUtility(MvcRazorHost razorHost)
-                : base(razorHost, chunkTreeCache: null, defaultInheritedChunks: new Chunk[0])
+            public PathValidatingChunkInheritanceUtility(MvcRazorHost razorHost, IChunkTreeCache chunkTreeCache)
+                : base(razorHost, chunkTreeCache, defaultInheritedChunks: new Chunk[0])
             {
             }
 
             public string InheritedChunkTreePagePath { get; private set; }
 
-            public override IReadOnlyList<ChunkTreeResult> GetInheritedChunkTreeResults([NotNull] string pagePath)
+            public override IReadOnlyList<ChunkTreeResult> GetInheritedChunkTreeResults(string pagePath)
             {
                 InheritedChunkTreePagePath = pagePath;
 
@@ -522,7 +527,8 @@ namespace Microsoft.AspNet.Mvc.Razor
             {
                 private readonly GeneratedTagHelperAttributeContext _tagHelperAttributeContext;
 
-                public TestCSharpCodeGenerator(CodeGeneratorContext context,
+                public TestCSharpCodeGenerator(
+                    CodeGeneratorContext context,
                     string defaultModel,
                     string activateAttribute,
                     GeneratedTagHelperAttributeContext tagHelperAttributeContext)

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

@@ -23,9 +23,8 @@ namespace Microsoft.AspNet.Mvc.Razor
 {
     public class RazorPageTest
     {
-#pragma warning disable 1998
-        private readonly RenderAsyncDelegate _nullRenderAsyncDelegate = async writer => { };
-#pragma warning restore 1998
+        private readonly RenderAsyncDelegate _nullRenderAsyncDelegate = writer => Task.FromResult(0);
+        private readonly Func<TextWriter, Task> NullAsyncWrite = CreateAsyncWriteDelegate(string.Empty);
 
         [Fact]
         public async Task WritingScopesRedirectContentWrittenToViewContextWriter()
@@ -304,7 +303,7 @@ namespace Microsoft.AspNet.Mvc.Razor
             {
                 { "baz", _nullRenderAsyncDelegate }
             };
-            page.RenderBodyDelegateAsync = CreateBodyAction("body-content");
+            page.RenderBodyDelegateAsync = CreateAsyncWriteDelegate("body-content");
 
             // Act
             await page.ExecuteAsync();
@@ -328,7 +327,7 @@ namespace Microsoft.AspNet.Mvc.Razor
             {
                 { "baz", _nullRenderAsyncDelegate }
             };
-            page.RenderBodyDelegateAsync = CreateBodyAction("body-content");
+            page.RenderBodyDelegateAsync = CreateAsyncWriteDelegate("body-content");
 
             // Act
             await page.ExecuteAsync();
@@ -341,7 +340,7 @@ namespace Microsoft.AspNet.Mvc.Razor
         public async Task RenderSection_ThrowsIfSectionIsRenderedMoreThanOnce()
         {
             // Arrange
-            var expected = new HelperResult(asyncAction: null);
+            var expected = new HelperResult(NullAsyncWrite);
             var page = CreatePage(v =>
             {
                 v.Path = "/Views/TestPath/Test.cshtml";
@@ -365,7 +364,7 @@ namespace Microsoft.AspNet.Mvc.Razor
         public async Task RenderSectionAsync_ThrowsIfSectionIsRenderedMoreThanOnce()
         {
             // Arrange
-            var expected = new HelperResult(asyncAction: null);
+            var expected = new HelperResult(NullAsyncWrite);
             var page = CreatePage(async v =>
             {
                 v.Path = "/Views/TestPath/Test.cshtml";
@@ -389,7 +388,7 @@ namespace Microsoft.AspNet.Mvc.Razor
         public async Task RenderSectionAsync_ThrowsIfSectionIsRenderedMoreThanOnce_WithSyncMethod()
         {
             // Arrange
-            var expected = new HelperResult(asyncAction: null);
+            var expected = new HelperResult(NullAsyncWrite);
             var page = CreatePage(async v =>
             {
                 v.Path = "/Views/TestPath/Test.cshtml";
@@ -413,7 +412,7 @@ namespace Microsoft.AspNet.Mvc.Razor
         public async Task RenderSectionAsync_ThrowsIfNotInvokedFromLayoutPage()
         {
             // Arrange
-            var expected = new HelperResult(asyncAction: null);
+            var expected = new HelperResult(NullAsyncWrite);
             var page = CreatePage(async v =>
             {
                 v.Path = "/Views/TestPath/Test.cshtml";
@@ -437,7 +436,7 @@ namespace Microsoft.AspNet.Mvc.Razor
             {
             });
             page.Path = path;
-            page.RenderBodyDelegateAsync = CreateBodyAction("some content");
+            page.RenderBodyDelegateAsync = CreateAsyncWriteDelegate("some content");
 
             // Act
             await page.ExecuteAsync();
@@ -457,7 +456,7 @@ namespace Microsoft.AspNet.Mvc.Razor
             {
             });
             page.Path = path;
-            page.RenderBodyDelegateAsync = CreateBodyAction("some content");
+            page.RenderBodyDelegateAsync = CreateAsyncWriteDelegate("some content");
             page.PreviousSectionWriters = new Dictionary<string, RenderAsyncDelegate>
             {
                 { sectionName, _nullRenderAsyncDelegate }
@@ -483,7 +482,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                 v.RenderSection(sectionA);
                 v.RenderSection(sectionB);
             });
-            page.RenderBodyDelegateAsync = CreateBodyAction("some content");
+            page.RenderBodyDelegateAsync = CreateAsyncWriteDelegate("some content");
             page.PreviousSectionWriters = new Dictionary<string, RenderAsyncDelegate>
             {
                 { sectionA, _nullRenderAsyncDelegate },
@@ -517,7 +516,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                 v.Write(v.RenderSection("footer"));
                 v.WriteLiteral("Layout end");
             });
-            page.RenderBodyDelegateAsync = CreateBodyAction("body content" + Environment.NewLine);
+            page.RenderBodyDelegateAsync = CreateAsyncWriteDelegate("body content" + Environment.NewLine);
             page.PreviousSectionWriters = new Dictionary<string, RenderAsyncDelegate>
             {
                 {
@@ -837,7 +836,7 @@ namespace Microsoft.AspNet.Mvc.Razor
             var executionContext = new TagHelperExecutionContext(
                 "p",
                 tagMode: TagMode.StartTagAndEndTag,
-                items: null,
+                items: new Dictionary<object, object>(),
                 uniqueId: string.Empty,
                 executeChildContentAsync: () => Task.FromResult(result: true),
                 startTagHelperWritingScope: () => { },
@@ -872,7 +871,7 @@ namespace Microsoft.AspNet.Mvc.Razor
             var executionContext = new TagHelperExecutionContext(
                 "p",
                 tagMode: TagMode.StartTagAndEndTag,
-                items: null,
+                items: new Dictionary<object, object>(),
                 uniqueId: string.Empty,
                 executeChildContentAsync: () => Task.FromResult(result: true),
                 startTagHelperWritingScope: () => { },
@@ -904,7 +903,7 @@ namespace Microsoft.AspNet.Mvc.Razor
             var executionContext = new TagHelperExecutionContext(
                 "p",
                 tagMode: TagMode.StartTagAndEndTag,
-                items: null,
+                items: new Dictionary<object, object>(),
                 uniqueId: string.Empty,
                 executeChildContentAsync: () => Task.FromResult(result: true),
                 startTagHelperWritingScope: () => { },
@@ -1060,7 +1059,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList(),
                             tagMode: TagMode.StartTagAndEndTag,
                             preElement:  null,
@@ -1359,7 +1358,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList(),
                             tagMode: TagMode.StartTagAndEndTag,
                             preElement:  "Before",
@@ -1371,7 +1370,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList { { "test", "testVal" } },
                             tagMode: TagMode.SelfClosing,
                             preElement:  "Before",
@@ -1407,7 +1406,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList { { "test", "testVal" } },
                             tagMode: TagMode.StartTagOnly,
                             preElement:  "Before",
@@ -1455,7 +1454,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList(),
                             tagMode: TagMode.StartTagAndEndTag,
                             preElement:  null,
@@ -1467,7 +1466,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList { { "test", "testVal" } },
                             tagMode: TagMode.SelfClosing,
                             preElement:  null,
@@ -1503,7 +1502,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList { { "test", "testVal" } },
                             tagMode: TagMode.StartTagOnly,
                             preElement:  null,
@@ -1575,7 +1574,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList(),
                             tagMode: TagMode.SelfClosing,
                             preElement:  "Before",
@@ -1599,7 +1598,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList(),
                             tagMode: TagMode.StartTagOnly,
                             preElement:  "Before",
@@ -1611,7 +1610,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList(),
                             tagMode: TagMode.StartTagAndEndTag,
                             preElement:  "Before",
@@ -1623,7 +1622,7 @@ namespace Microsoft.AspNet.Mvc.Razor
                     },
                     {
                         GetTagHelperOutput(
-                            tagName:     null,
+                            tagName:     "",
                             attributes:  new TagHelperAttributeList { { "test", "testVal" } },
                             tagMode: TagMode.StartTagAndEndTag,
                             preElement:  "Before",
@@ -1790,7 +1789,8 @@ namespace Microsoft.AspNet.Mvc.Razor
             return output;
         }
 
-        private static TestableRazorPage CreatePage(Action<TestableRazorPage> executeAction,
+        private static TestableRazorPage CreatePage(
+            Action<TestableRazorPage> executeAction,
             ViewContext context = null)
         {
             return CreatePage(page =>
@@ -1801,7 +1801,8 @@ namespace Microsoft.AspNet.Mvc.Razor
         }
 
 
-        private static TestableRazorPage CreatePage(Func<TestableRazorPage, Task> executeAction,
+        private static TestableRazorPage CreatePage(
+            Func<TestableRazorPage, Task> executeAction,
             ViewContext context = null)
         {
             context = context ?? CreateViewContext();
@@ -1832,13 +1833,18 @@ namespace Microsoft.AspNet.Mvc.Razor
                 new HtmlHelperOptions());
         }
 
-        private static Func<TextWriter, Task> CreateBodyAction(string value)
+        private static Func<TextWriter, Task> CreateAsyncWriteDelegate(string value)
         {
             return async (writer) => await writer.WriteAsync(value);
         }
 
         public abstract class TestableRazorPage : RazorPage
         {
+            public TestableRazorPage()
+            {
+                HtmlEncoder = new CommonTestEncoder();
+            }
+
             public string RenderedContent
             {
                 get

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

@@ -1484,6 +1484,7 @@ namespace Microsoft.AspNet.Mvc.Razor
             public TestableRazorPage(Action<TestableRazorPage> executeAction)
             {
                 _executeAction = executeAction;
+                HtmlEncoder = new CommonTestEncoder();
             }
 
             public void RenderBodyPublic()

test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs

@@ -279,10 +279,10 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var generator = new TestableHtmlGenerator(new EmptyModelMetadataProvider());
 
             var validationSummaryTagHelper = new ValidationSummaryTagHelper(generator);
-            var expectedMessage = string.Format(
-                @"The value of argument 'value' ({0}) is invalid for Enum type 'Microsoft.AspNet.Mvc.ValidationSummary'.
-Parameter name: value",
-                validationSummary);
+            var validationTypeName = typeof(ValidationSummary).FullName;
+            var expectedMessage =
+                $@"The value of argument 'value' ({validationSummary}) is invalid for Enum type '{validationTypeName}'.
+Parameter name: value";
 
             // Act & Assert
             var ex = Assert.Throws<ArgumentException>(

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

@@ -254,7 +254,7 @@ namespace Microsoft.AspNet.Mvc
         public async Task ExecuteAsync_Throws_IfNoViewEngineCanBeResolved()
         {
             // Arrange
-            var expected = "No service for type 'Microsoft.AspNet.Mvc.Rendering.ICompositeViewEngine'" +
+            var expected = $"No service for type '{typeof(ICompositeViewEngine).FullName}'" +
                 " has been registered.";
 
             var view = Mock.Of<IView>();