Remove IHttpContextAccessor from TempData

This change removes the dependency of TempData on the IHttpContextAccessor
by creating an ITempDataDictionaryFactory abstraction. In general, no one
will replace the factory, it's just indirection.

This allows us to drop our dependency on IHttpContextAccessor, and move it
to the functional tests where we specifically depend on it.

The bulk of code churn here is to update tests that use TempData.

src/Microsoft.AspNet.Mvc.Core/DependencyInjection/MvcCoreServiceCollectionExtensions.cs

@@ -138,7 +138,6 @@ namespace Microsoft.Extensions.DependencyInjection
             services.TryAddSingleton<MvcMarkerService, MvcMarkerService>();
             services.TryAddSingleton<ITypeActivatorCache, DefaultTypeActivatorCache>();
             services.TryAddSingleton<IActionContextAccessor, ActionContextAccessor>();
-            services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
             services.TryAddSingleton<IUrlHelper, UrlHelper>();
             services.TryAddSingleton<IHttpRequestStreamReaderFactory, MemoryPoolHttpRequestStreamReaderFactory>();
             services.TryAddSingleton<IHttpResponseStreamWriterFactory, MemoryPoolHttpResponseStreamWriterFactory>();

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

@@ -260,7 +260,8 @@ namespace Microsoft.AspNet.Mvc
             {
                 if (_tempData == null)
                 {
-                    _tempData = Resolver?.GetRequiredService<ITempDataDictionary>();
+                    var factory = Resolver?.GetRequiredService<ITempDataDictionaryFactory>();
+                    _tempData = factory?.GetTempData(HttpContext);
                 }
 
                 return _tempData;

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

@@ -101,10 +101,7 @@ namespace Microsoft.Extensions.DependencyInjection
             //
             services.TryAddTransient<IHtmlHelper, HtmlHelper>();
             services.TryAddTransient(typeof(IHtmlHelper<>), typeof(HtmlHelper<>));
-
+            services.TryAddSingleton<IHtmlGenerator, DefaultHtmlGenerator>();
-            // DefaultHtmlGenerator is pretty much stateless but depends on IUrlHelper, which is scoped.
-            // Therefore it too is scoped.
-            services.TryAddScoped<IHtmlGenerator, DefaultHtmlGenerator>();
 
             //
             // JSON Helper
@@ -133,12 +130,12 @@ namespace Microsoft.Extensions.DependencyInjection
             //
             // Temp Data
             //
-            // Holds per-request data so it should be scoped
-            services.TryAddScoped<ITempDataDictionary, TempDataDictionary>();
-            services.TryAddScoped<SaveTempDataFilter>();
-
             // This does caching so it should stay singleton
             services.TryAddSingleton<ITempDataProvider, SessionStateTempDataProvider>();
+
+            // These are stateless so their lifetime isn't really important.
+            services.TryAddSingleton<ITempDataDictionaryFactory, TempDataDictionaryFactory>();
+            services.TryAddSingleton<SaveTempDataFilter>();
         }
     }
 }

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

@@ -88,7 +88,8 @@ namespace Microsoft.AspNet.Mvc
             var tempData = TempData;
             if (tempData == null)
             {
-                tempData = services.GetRequiredService<ITempDataDictionary>();
+                var factory = services.GetRequiredService<ITempDataDictionaryFactory>();
+                tempData = factory.GetTempData(context.HttpContext);
             }
 
             string resolvedContentType = null;

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

@@ -0,0 +1,25 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Microsoft.AspNet.Http;
+
+namespace Microsoft.AspNet.Mvc.ViewFeatures
+{
+    /// <summary>
+    /// A factory which provides access to an <see cref="ITempDataDictionary"/> instance
+    /// for a request.
+    /// </summary>
+    public interface ITempDataDictionaryFactory
+    {
+        /// <summary>
+        /// Gets or creates an <see cref="ITempDataDictionary"/> instance for the request associated with the
+        /// given <paramref name="context"/>.
+        /// </summary>
+        /// <param name="context">The <see cref="HttpContext"/>.</param>
+        /// <returns>
+        /// An <see cref="ITempDataDictionary"/> instance for the request associated with the given
+        /// <paramref name="context"/>.
+        /// </returns>
+        ITempDataDictionary GetTempData(HttpContext context);
+    }
+}

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

@@ -27,15 +27,17 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <param name="viewOptions">The <see cref="IOptions{MvcViewOptions}"/>.</param>
         /// <param name="writerFactory">The <see cref="IHttpResponseStreamWriterFactory"/>.</param>
         /// <param name="viewEngine">The <see cref="ICompositeViewEngine"/>.</param>
+        /// <param name="tempDataFactory">The <see cref="ITempDataDictionaryFactory"/>.</param>
         /// <param name="diagnosticSource">The <see cref="DiagnosticSource"/>.</param>
         /// <param name="loggerFactory">The <see cref="ILoggerFactory"/>.</param>
         public PartialViewResultExecutor(
             IOptions<MvcViewOptions> viewOptions,
             IHttpResponseStreamWriterFactory writerFactory,
             ICompositeViewEngine viewEngine,
+            ITempDataDictionaryFactory tempDataFactory,
             DiagnosticSource diagnosticSource,
             ILoggerFactory loggerFactory)
-            : base(viewOptions, writerFactory, viewEngine, diagnosticSource)
+            : base(viewOptions, writerFactory, viewEngine, tempDataFactory, diagnosticSource)
         {
             if (loggerFactory == null)
             {

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

@@ -10,15 +10,15 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
     /// </summary>
     public class SaveTempDataFilter : IResourceFilter, IResultFilter
     {
-        private readonly ITempDataDictionary _tempData;
+        private readonly ITempDataDictionaryFactory _factory;
 
         /// <summary>
         /// Creates a new instance of <see cref="SaveTempDataFilter"/>.
         /// </summary>
-        /// <param name="tempData">The <see cref="ITempDataDictionary"/> for the current request.</param>
+        /// <param name="factory">The <see cref="ITempDataDictionaryFactory"/>.</param>
-        public SaveTempDataFilter(ITempDataDictionary tempData)
+        public SaveTempDataFilter(ITempDataDictionaryFactory factory)
         {
-            _tempData = tempData;
+            _factory = factory;
         }
 
         /// <inheritdoc />
@@ -29,7 +29,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <inheritdoc />
         public void OnResourceExecuted(ResourceExecutedContext context)
         {
-            _tempData.Save();
+            _factory.GetTempData(context.HttpContext).Save();
         }
 
         /// <inheritdoc />
@@ -42,7 +42,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         {
             if (context.Result is IKeepTempDataResult)
             {
-                _tempData.Keep();
+                _factory.GetTempData(context.HttpContext).Keep();
             }
         }
     }

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

@@ -14,16 +14,16 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         private Dictionary<string, object> _data;
         private bool _loaded;
         private readonly ITempDataProvider _provider;
-        private readonly IHttpContextAccessor _contextAccessor;
+        private readonly HttpContext _context;
         private HashSet<string> _initialKeys = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
         private HashSet<string> _retainedKeys = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
 
         /// <summary>
         /// Initializes a new instance of the <see cref="TempDataDictionary"/> class.
         /// </summary>
-        /// <param name="context">The <see cref="IHttpContextAccessor"/> that provides the HttpContext.</param>
+        /// <param name="context">The <see cref="HttpContext"/>.</param>
         /// <param name="provider">The <see cref="ITempDataProvider"/> used to Load and Save data.</param>
-        public TempDataDictionary(IHttpContextAccessor context, ITempDataProvider provider)
+        public TempDataDictionary(HttpContext context, ITempDataProvider provider)
         {
             if (context == null)
             {
@@ -37,7 +37,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
             _provider = provider;
             _loaded = false;
-            _contextAccessor = context;
+            _context = context;
         }
 
         public int Count
@@ -127,7 +127,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 return;
             }
 
-            var providerDictionary = _provider.LoadTempData(_contextAccessor.HttpContext);
+            var providerDictionary = _provider.LoadTempData(_context);
             _data = (providerDictionary != null)
                 ? new Dictionary<string, object>(providerDictionary, StringComparer.OrdinalIgnoreCase)
                 : new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
@@ -161,7 +161,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 _data.Remove(keys[i]);
             }
 
-            _provider.SaveTempData(_contextAccessor.HttpContext, _data);
+            _provider.SaveTempData(_context, _data);
         }
 
         /// <inheritdoc />

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

@@ -0,0 +1,55 @@
+// 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.Http;
+
+namespace Microsoft.AspNet.Mvc.ViewFeatures
+{
+    /// <summary>
+    /// A default implementation of <see cref="ITempDataDictionaryFactory"/>.
+    /// </summary>
+    public class TempDataDictionaryFactory : ITempDataDictionaryFactory
+    {
+        private static readonly object Key = typeof(ITempDataDictionary);
+
+        private readonly ITempDataProvider _provider;
+
+        /// <summary>
+        /// Creates a new <see cref="TempDataDictionaryFactory"/>.
+        /// </summary>
+        /// <param name="provider">The <see cref="ITempDataProvider"/>.</param>
+        public TempDataDictionaryFactory(ITempDataProvider provider)
+        {
+            if (provider == null)
+            {
+                throw new ArgumentNullException(nameof(provider));
+            }
+
+            _provider = provider;
+        }
+
+        /// <inheritdoc />
+        public ITempDataDictionary GetTempData(HttpContext context)
+        {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            object obj;
+            ITempDataDictionary result;
+            if (context.Items.TryGetValue(Key, out obj))
+            {
+                result = (ITempDataDictionary)obj;
+            }
+            else
+            {
+                result = new TempDataDictionary(context, _provider);
+                context.Items.Add(Key, result);
+            }
+
+            return result;
+        }
+    }
+}

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

@@ -36,11 +36,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <param name="viewOptions">The <see cref="IOptions{MvcViewOptions}"/>.</param>
         /// <param name="writerFactory">The <see cref="IHttpResponseStreamWriterFactory"/>.</param>
         /// <param name="viewEngine">The <see cref="ICompositeViewEngine"/>.</param>
+        /// <param name="tempDataFactory">The <see cref="ITempDataDictionaryFactory"/>.</param>
         /// <param name="diagnosticSource">The <see cref="DiagnosticSource"/>.</param>
         public ViewExecutor(
             IOptions<MvcViewOptions> viewOptions,
             IHttpResponseStreamWriterFactory writerFactory,
             ICompositeViewEngine viewEngine,
+            ITempDataDictionaryFactory tempDataFactory,
             DiagnosticSource diagnosticSource)
         {
             if (viewOptions == null)
@@ -58,6 +60,11 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 throw new ArgumentNullException(nameof(viewEngine));
             }
 
+            if (tempDataFactory == null)
+            {
+                throw new ArgumentNullException(nameof(tempDataFactory));
+            }
+
             if (diagnosticSource == null)
             {
                 throw new ArgumentNullException(nameof(diagnosticSource));
@@ -66,6 +73,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             ViewOptions = viewOptions.Value;
             WriterFactory = writerFactory;
             ViewEngine = viewEngine;
+            TempDataFactory = tempDataFactory;
             DiagnosticSource = diagnosticSource;
         }
 
@@ -74,6 +82,11 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// </summary>
         protected DiagnosticSource DiagnosticSource { get; }
 
+        /// <summary>
+        /// Gets the <see cref="ITempDataDictionaryFactory"/>.
+        /// </summary>
+        protected ITempDataDictionaryFactory TempDataFactory { get; }
+
         /// <summary>
         /// Gets the default <see cref="IViewEngine"/>.
         /// </summary>
@@ -131,7 +144,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
             if (tempData == null)
             {
-                tempData = services.GetRequiredService<ITempDataDictionary>();
+                tempData = TempDataFactory.GetTempData(actionContext.HttpContext);
             }
 
             var response = actionContext.HttpContext.Response;

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

@@ -25,15 +25,17 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         /// <param name="viewOptions">The <see cref="IOptions{MvcViewOptions}"/>.</param>
         /// <param name="writerFactory">The <see cref="IHttpResponseStreamWriterFactory"/>.</param>
         /// <param name="viewEngine">The <see cref="ICompositeViewEngine"/>.</param>
+        /// <param name="tempDataFactory">The <see cref="ITempDataDictionaryFactory"/>.</param>
         /// <param name="diagnosticSource">The <see cref="DiagnosticSource"/>.</param>
         /// <param name="loggerFactory">The <see cref="ILoggerFactory"/>.</param>
         public ViewResultExecutor(
             IOptions<MvcViewOptions> viewOptions,
             IHttpResponseStreamWriterFactory writerFactory,
             ICompositeViewEngine viewEngine,
+            ITempDataDictionaryFactory tempDataFactory,
             DiagnosticSource diagnosticSource,
             ILoggerFactory loggerFactory)
-            : base(viewOptions, writerFactory, viewEngine, diagnosticSource)
+            : base(viewOptions, writerFactory, viewEngine, tempDataFactory, diagnosticSource)
         {
             if (loggerFactory == null)
             {

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

@@ -968,7 +968,7 @@ namespace Microsoft.AspNet.Mvc.Test
             var controller = new TestableController()
             {
                 ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
-                TempData = new TempDataDictionary(Mock.Of<IHttpContextAccessor>(), Mock.Of<ITempDataProvider>()),
+                TempData = new TempDataDictionary(new DefaultHttpContext(), Mock.Of<ITempDataProvider>()),
             };
 
             // Act
@@ -989,7 +989,7 @@ namespace Microsoft.AspNet.Mvc.Test
             var controller = new TestableController()
             {
                 ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
-                TempData = new TempDataDictionary(Mock.Of<IHttpContextAccessor>(), Mock.Of<ITempDataProvider>()),
+                TempData = new TempDataDictionary(new DefaultHttpContext(), Mock.Of<ITempDataProvider>()),
             };
 
             // Act
@@ -1010,7 +1010,7 @@ namespace Microsoft.AspNet.Mvc.Test
             var controller = new TestableController()
             {
                 ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
-                TempData = new TempDataDictionary(Mock.Of<IHttpContextAccessor>(), Mock.Of<ITempDataProvider>()),
+                TempData = new TempDataDictionary(new DefaultHttpContext(), Mock.Of<ITempDataProvider>()),
             };
             var model = new object();
 
@@ -1032,7 +1032,7 @@ namespace Microsoft.AspNet.Mvc.Test
             var controller = new TestableController()
             {
                 ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider()),
-                TempData = new TempDataDictionary(Mock.Of<IHttpContextAccessor>(), Mock.Of<ITempDataProvider>()),
+                TempData = new TempDataDictionary(new DefaultHttpContext(), Mock.Of<ITempDataProvider>()),
             };
             var model = new object();
 
@@ -1856,7 +1856,7 @@ namespace Microsoft.AspNet.Mvc.Test
             var httpContext = new DefaultHttpContext();
 
             var viewData = new ViewDataDictionary(metadataProvider, new ModelStateDictionary());
-            var tempData = new TempDataDictionary(Mock.Of<IHttpContextAccessor>(), Mock.Of<ITempDataProvider>());
+            var tempData = new TempDataDictionary(httpContext, Mock.Of<ITempDataProvider>());
 
             var controllerContext = new ControllerContext()
             {

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

@@ -199,6 +199,7 @@ namespace Microsoft.AspNet.Mvc
                 options,
                 new TestHttpResponseStreamWriterFactory(),
                 new CompositeViewEngine(options),
+                new TempDataDictionaryFactory(new SessionStateTempDataProvider()),
                 new DiagnosticListener("Microsoft.AspNet"),
                 NullLoggerFactory.Instance);
 

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

@@ -287,7 +287,7 @@ namespace Microsoft.AspNet.Mvc.Rendering
                 Mock.Of<IView>(),
                 viewData,
                 new TempDataDictionary(
-                    new HttpContextAccessor(),
+                    httpContext,
                     Mock.Of<ITempDataProvider>()),
                 new StringWriter(),
                 options.HtmlHelperOptions);

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

@@ -20,12 +20,13 @@ namespace Microsoft.AspNet.Mvc.Rendering
         public void SettingViewData_AlsoUpdatesViewBag()
         {
             // Arrange
+            var httpContext = new DefaultHttpContext();
             var originalViewData = new ViewDataDictionary(metadataProvider: new EmptyModelMetadataProvider());
             var context = new ViewContext(
                 new ActionContext(new DefaultHttpContext(), new RouteData(), new ActionDescriptor()),
                 view: Mock.Of<IView>(),
                 viewData: originalViewData,
-                tempData: new TempDataDictionary(new HttpContextAccessor(), Mock.Of<ITempDataProvider>()),
+                tempData: new TempDataDictionary(httpContext, Mock.Of<ITempDataProvider>()),
                 writer: TextWriter.Null,
                 htmlHelperOptions: new HtmlHelperOptions());
             var replacementViewData = new ViewDataDictionary(metadataProvider: new EmptyModelMetadataProvider());
@@ -47,11 +48,12 @@ namespace Microsoft.AspNet.Mvc.Rendering
         public void CopyConstructor_CopiesExpectedProperties()
         {
             // Arrange
+            var httpContext = new DefaultHttpContext();
             var originalContext = new ViewContext(
-                new ActionContext(new DefaultHttpContext(), new RouteData(), new ActionDescriptor()),
+                new ActionContext(httpContext, new RouteData(), new ActionDescriptor()),
                 view: Mock.Of<IView>(),
                 viewData: new ViewDataDictionary(metadataProvider: new EmptyModelMetadataProvider()),
-                tempData: new TempDataDictionary(new HttpContextAccessor(), Mock.Of<ITempDataProvider>()),
+                tempData: new TempDataDictionary(httpContext, Mock.Of<ITempDataProvider>()),
                 writer: TextWriter.Null,
                 htmlHelperOptions: new HtmlHelperOptions());
             var view = Mock.Of<IView>();

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

@@ -30,7 +30,7 @@ namespace Microsoft.AspNet.Mvc
     public class ViewComponentResultTest
     {
         private readonly ITempDataDictionary _tempDataDictionary =
-            new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider());
+            new TempDataDictionary(new DefaultHttpContext(), new SessionStateTempDataProvider());
 
         [Fact]
         public async Task ExecuteAsync_ViewComponentResult_AllowsNullViewDataAndTempData()
@@ -460,8 +460,7 @@ namespace Microsoft.AspNet.Mvc
 
         private IServiceCollection CreateServices(object diagnosticListener, HttpContext context, params ViewComponentDescriptor[] descriptors)
         {
-            var httpContext = new HttpContextAccessor() { HttpContext = context };
+            var httpContext = new DefaultHttpContext();
-            var tempDataProvider = new SessionStateTempDataProvider();
             var diagnosticSource = new DiagnosticListener("Microsoft.AspNet");
             if (diagnosticListener != null)
             {
@@ -480,8 +479,8 @@ namespace Microsoft.AspNet.Mvc
             services.AddSingleton<IViewComponentDescriptorProvider>(new FixedSetViewComponentDescriptorProvider(descriptors));
             services.AddSingleton<IModelMetadataProvider, EmptyModelMetadataProvider>();
             services.AddSingleton<ILoggerFactory>(NullLoggerFactory.Instance);
-            services.AddSingleton<ITempDataDictionary>(new TempDataDictionary(httpContext, tempDataProvider));
+            services.AddSingleton<ITempDataDictionaryFactory, TempDataDictionaryFactory>();
-            services.AddTransient<IHttpContextAccessor, HttpContextAccessor>();
+            services.AddSingleton<ITempDataProvider, SessionStateTempDataProvider>();
             services.AddSingleton<HtmlEncoder, HtmlTestEncoder>();
 
             return services;

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

@@ -37,13 +37,14 @@ namespace Microsoft.AspNet.Mvc
 
         private static ViewComponentContext GetViewComponentContext(IView view, Stream stream)
         {
-            var actionContext = new ActionContext(new DefaultHttpContext(), new RouteData(), new ActionDescriptor());
+            var httpContext = new DefaultHttpContext();
+            var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());
             var viewData = new ViewDataDictionary(new EmptyModelMetadataProvider());
             var viewContext = new ViewContext(
                 actionContext,
                 view,
                 viewData, 
-                new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider()),
+                new TempDataDictionary(httpContext, new SessionStateTempDataProvider()),
                 TextWriter.Null,
                 new HtmlHelperOptions());
 

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

@@ -44,7 +44,7 @@ namespace Microsoft.AspNet.Mvc
                 actionContext,
                 view,
                 viewData,
-                new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider()),
+                new TempDataDictionary(actionContext.HttpContext, new SessionStateTempDataProvider()),
                 TextWriter.Null,
                 new HtmlHelperOptions());
 

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

@@ -24,7 +24,7 @@ namespace Microsoft.AspNet.Mvc
     public class ViewViewComponentResultTest
     {
         private readonly ITempDataDictionary _tempDataDictionary =
-            new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider());
+            new TempDataDictionary(new DefaultHttpContext(), new SessionStateTempDataProvider());
 
         [Fact]
         public void Execute_RendersPartialViews()
@@ -527,7 +527,7 @@ namespace Microsoft.AspNet.Mvc
                 actionContext,
                 view,
                 viewData,
-                new TempDataDictionary(new HttpContextAccessor(), new SessionStateTempDataProvider()),
+                new TempDataDictionary(httpContext, new SessionStateTempDataProvider()),
                 TextWriter.Null,
                 new HtmlHelperOptions());
 

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

@@ -337,6 +337,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 options,
                 new TestHttpResponseStreamWriterFactory(),
                 new CompositeViewEngine(options),
+                new TempDataDictionaryFactory(new SessionStateTempDataProvider()),
                 diagnosticSource,
                 NullLoggerFactory.Instance);
 

test/Microsoft.AspNet.Mvc.ViewFeatures.Test/ViewFeatures/SaveTempDataFilterTest.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 Microsoft.AspNet.Http;
 using Microsoft.AspNet.Http.Internal;
 using Microsoft.AspNet.Mvc.Abstractions;
 using Microsoft.AspNet.Mvc.Filters;
@@ -21,7 +22,12 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 .Setup(m => m.Save())
                 .Verifiable();
 
-            var filter = new SaveTempDataFilter(tempData.Object);
+            var tempDataFactory = new Mock<ITempDataDictionaryFactory>(MockBehavior.Strict);
+            tempDataFactory
+                .Setup(f => f.GetTempData(It.IsAny<HttpContext>()))
+                .Returns(tempData.Object);
+
+            var filter = new SaveTempDataFilter(tempDataFactory.Object);
 
             var context = new ResourceExecutedContext(
                 new ActionContext(new DefaultHttpContext(), new RouteData(), new ActionDescriptor()),
@@ -43,7 +49,12 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 .Setup(m => m.Keep())
                 .Verifiable();
 
-            var filter = new SaveTempDataFilter(tempData.Object);
+            var tempDataFactory = new Mock<ITempDataDictionaryFactory>(MockBehavior.Strict);
+            tempDataFactory
+                .Setup(f => f.GetTempData(It.IsAny<HttpContext>()))
+                .Returns(tempData.Object);
+
+            var filter = new SaveTempDataFilter(tempDataFactory.Object);
 
             var context = new ResultExecutedContext(
                 new ActionContext(new DefaultHttpContext(), new RouteData(), new ActionDescriptor()),
@@ -63,7 +74,13 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         {
             // Arrange
             var tempData = new Mock<ITempDataDictionary>(MockBehavior.Strict);
-            var filter = new SaveTempDataFilter(tempData.Object);
+
+            var tempDataFactory = new Mock<ITempDataDictionaryFactory>(MockBehavior.Strict);
+            tempDataFactory
+                .Setup(f => f.GetTempData(It.IsAny<HttpContext>()))
+                .Returns(tempData.Object);
+
+            var filter = new SaveTempDataFilter(tempDataFactory.Object);
 
             var context = new ResultExecutedContext(
                 new ActionContext(new DefaultHttpContext(), new RouteData(), new ActionDescriptor()),

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

@@ -0,0 +1,52 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Microsoft.AspNet.Http.Internal;
+using Xunit;
+
+namespace Microsoft.AspNet.Mvc.ViewFeatures
+{
+    public class TempDataDictionaryFactoryTest
+    {
+        [Fact]
+        public void Factory_CreatesTempData_ForEachHttpContext()
+        {
+            // Arrange
+            var factory = CreateFactory();
+
+            var context1 = new DefaultHttpContext();
+            var context2 = new DefaultHttpContext();
+
+            var tempData1 = factory.GetTempData(context1);
+
+            // Act
+            var tempData2 = factory.GetTempData(context2);
+
+            // Assert
+            Assert.NotSame(tempData1, tempData2);
+        }
+
+        [Fact]
+        public void Factory_StoresTempData_InHttpContext()
+        {
+            // Arrange
+            var factory = CreateFactory();
+
+            var context = new DefaultHttpContext();
+
+            var tempData1 = factory.GetTempData(context);
+
+            // Act
+            var tempData2 = factory.GetTempData(context);
+
+            // Assert
+            Assert.Same(tempData1, tempData2);
+        }
+
+        private TempDataDictionaryFactory CreateFactory()
+        {
+            var provider = new SessionStateTempDataProvider();
+            return new TempDataDictionaryFactory(provider);
+        }
+    }
+}

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

@@ -15,7 +15,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void ThrowscdException_OnSettingValue_AndWhenSessionIsNotEnabled()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new SessionStateTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new SessionStateTempDataProvider());
 
             // Act & Assert
             Assert.Throws<InvalidOperationException>(() =>
@@ -28,7 +28,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void Keep_DoesNotThrowException_WhenDataIsNotLoaded()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new SessionStateTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new SessionStateTempDataProvider());
 
             // Act & Assert
             tempData.Keep();
@@ -38,7 +38,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void TempData_Load_CreatesEmptyDictionaryIfProviderReturnsNull()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
 
             // Act
             tempData.Load();
@@ -51,7 +51,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void TempData_Save_RemovesKeysThatWereRead()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
             tempData["Foo"] = "Foo";
             tempData["Bar"] = "Bar";
 
@@ -68,7 +68,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void TempData_EnumeratingDictionary_MarksKeysForDeletion()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
             tempData["Foo"] = "Foo";
             tempData["Bar"] = "Bar";
 
@@ -88,7 +88,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         [Fact]
         public void TempData_TryGetValue_MarksKeyForDeletion()
         {
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
             object value;
             tempData["Foo"] = "Foo";
 
@@ -104,7 +104,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void TempData_Keep_RetainsAllKeysWhenSavingDictionary()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
             tempData["Foo"] = "Foo";
             tempData["Bar"] = "Bar";
 
@@ -121,7 +121,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void TempData_Keep_RetainsSpecificKeysWhenSavingDictionary()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
             tempData["Foo"] = "Foo";
             tempData["Bar"] = "Bar";
 
@@ -140,7 +140,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void TempData_Peek_DoesNotMarkKeyForDeletion()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
             tempData["Bar"] = "barValue";
 
             // Act
@@ -156,7 +156,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         public void TempData_CompareIsOrdinalIgnoreCase()
         {
             // Arrange
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
             var item = new object();
 
             // Act
@@ -175,7 +175,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             data["Foo"] = "Foo";
             data["Bar"] = "Bar";
             var provider = new TestTempDataProvider(data);
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), provider);
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), provider);
 
             // Act
             tempData.Load();
@@ -190,7 +190,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
         [Fact]
         public void TempData_RemovalOfKeysAreCaseInsensitive()
         {
-            var tempData = new TempDataDictionary(GetHttpContextAccessor(), new NullTempDataProvider());
+            var tempData = new TempDataDictionary(new DefaultHttpContext(), new NullTempDataProvider());
             object fooValue;
             tempData["Foo"] = "Foo";
             tempData["Bar"] = "Bar";
@@ -235,10 +235,5 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
             {
             }
         }
-
-        private static IHttpContextAccessor GetHttpContextAccessor()
-        {
-            return new HttpContextAccessor() { HttpContext = new DefaultHttpContext() };
-        }
     }
 }

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

@@ -125,7 +125,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
 
         private static IServiceProvider GetServiceProvider()
         {
-            var httpContext = new HttpContextAccessor() { HttpContext = new DefaultHttpContext() };
+            var httpContext = new DefaultHttpContext();
             var serviceCollection = new ServiceCollection();
             serviceCollection.AddSingleton<IModelMetadataProvider>(new EmptyModelMetadataProvider());
             var tempDataProvider = new SessionStateTempDataProvider();
@@ -357,6 +357,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 new TestOptionsManager<MvcViewOptions>(),
                 new TestHttpResponseStreamWriterFactory(),
                 new Mock<ICompositeViewEngine>(MockBehavior.Strict).Object,
+                new TempDataDictionaryFactory(new SessionStateTempDataProvider()),
                 diagnosticSource);
         }
     }

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

@@ -333,6 +333,7 @@ namespace Microsoft.AspNet.Mvc.ViewFeatures
                 options,
                 new TestHttpResponseStreamWriterFactory(),
                 new CompositeViewEngine(options),
+                new TempDataDictionaryFactory(new SessionStateTempDataProvider()),
                 diagnosticSource,
                 NullLoggerFactory.Instance);
 

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

@@ -198,6 +198,7 @@ namespace Microsoft.AspNet.Mvc
                 options,
                 new TestHttpResponseStreamWriterFactory(),
                 new CompositeViewEngine(options),
+                new TempDataDictionaryFactory(new SessionStateTempDataProvider()),
                 new DiagnosticListener("Microsoft.AspNet"),
                NullLoggerFactory.Instance);
 

test/WebSites/ControllersFromServicesWebSite/Startup.cs

@@ -5,6 +5,8 @@ using System;
 using System.Reflection;
 using ControllersFromServicesClassLibrary;
 using Microsoft.AspNet.Builder;
+using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Internal;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace ControllersFromServicesWebSite
@@ -21,6 +23,7 @@ namespace ControllersFromServicesWebSite
                 });
 
             services.AddTransient<QueryValueService>();
+            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
 
             return services.BuildServiceProvider();
         }

test/WebSites/RequestServicesWebSite/Startup.cs

@@ -2,6 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNet.Builder;
+using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Internal;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace RequestServicesWebSite
@@ -14,6 +16,7 @@ namespace RequestServicesWebSite
             services.AddMvc();
 
             services.AddScoped<RequestIdService>();
+            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
         }
 
         public void Configure(IApplicationBuilder app)