Replaced WebUtility.HtmlEncode with IHtmlEncoder.HtmlEncode

src/Microsoft.AspNet.Razor.Runtime/TagHelpers/TagHelperOutput.cs

@@ -4,9 +4,9 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
-using System.Net;
 using System.Text;
 using Microsoft.Framework.Internal;
+using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
 {
@@ -19,6 +19,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         private bool _contentSet;
         private bool _isTagNameNullOrWhitespace;
         private string _tagName;
+        private readonly IHtmlEncoder _htmlEncoder;
 
         // Internal for testing
         internal TagHelperOutput(string tagName)
@@ -32,13 +33,19 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         /// </summary>
         /// <param name="tagName">The HTML element's tag name.</param>
         /// <param name="attributes">The HTML attributes.</param>
-        public TagHelperOutput(string tagName, [NotNull] IDictionary<string, string> attributes)
+        /// <param name="htmlEncoder">The <see cref="IHtmlEncoder"/> used
+        /// to encode HTML attribute values.</param>
+        public TagHelperOutput(
+            string tagName,
+            [NotNull] IDictionary<string, string> attributes,
+            [NotNull] IHtmlEncoder htmlEncoder)
         {
             TagName = tagName;
             Attributes = new Dictionary<string, string>(attributes, StringComparer.OrdinalIgnoreCase);
             PreContent = string.Empty;
             _content = string.Empty;
             PostContent = string.Empty;
+            _htmlEncoder = htmlEncoder;
         }
 
         /// <summary>
@@ -131,7 +138,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
 
             foreach (var attribute in Attributes)
             {
-                var value = WebUtility.HtmlEncode(attribute.Value);
+                var value = _htmlEncoder.HtmlEncode(attribute.Value);
                 sb.Append(' ')
                   .Append(attribute.Key)
                   .Append("=\"")

src/Microsoft.AspNet.Razor.Runtime/TagHelpers/TagHelperRunner.cs

@@ -4,6 +4,7 @@
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.Framework.Internal;
+using Microsoft.Framework.WebEncoders;
 
 namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
 {
@@ -12,6 +13,17 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
     /// </summary>
     public class TagHelperRunner
     {
+        private readonly IHtmlEncoder _htmlEncoder;
+
+        /// <summary>
+        /// Instantiates a new instance of <see cref="TagHelperRunner"/>.
+        /// </summary>
+        /// <param name="htmlEncoder">The <see cref="IHtmlEncoder"/> used to encode HTML.</param>
+        public TagHelperRunner([NotNull] IHtmlEncoder htmlEncoder)
+        {
+            _htmlEncoder = htmlEncoder;
+        }
+
         /// <summary>
         /// Calls the <see cref="ITagHelper.ProcessAsync"/> method on <see cref="ITagHelper"/>s.
         /// </summary>
@@ -26,7 +38,10 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
                 executionContext.Items,
                 executionContext.UniqueId,
                 executionContext.GetChildContentAsync);
-            var tagHelperOutput = new TagHelperOutput(executionContext.TagName, executionContext.HTMLAttributes)
+            var tagHelperOutput = new TagHelperOutput(
+                executionContext.TagName,
+                executionContext.HTMLAttributes,
+                _htmlEncoder)
             {
                 SelfClosing = executionContext.SelfClosing,
             };

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

@@ -4,7 +4,8 @@
     "dependencies": {
         "Microsoft.AspNet.Razor": "4.0.0-*",
         "Microsoft.Framework.CopyOnWriteDictionary.Internal": { "type": "build", "version": "1.0.0-*" },
-        "Microsoft.Framework.NotNullAttribute.Internal": { "type": "build", "version": "1.0.0-*" }
+        "Microsoft.Framework.NotNullAttribute.Internal": { "type": "build", "version": "1.0.0-*" },
+        "Microsoft.Framework.WebEncoders": "1.0.0-*"
     },
     "frameworks": {
         "net45": { },

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/CSharpCodeBuilder.cs

@@ -66,6 +66,7 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
                     {
                         using (writer.BuildMethodDeclaration("public override async", "Task", Host.GeneratedClassContext.ExecuteMethodName))
                         {
+                            new CSharpTagHelperRunnerInitializationVisitor(writer, Context).Accept(Tree.Chunks);
                             csharpCodeVisitor.Accept(Tree.Chunks);
                         }
                     }

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpTagHelperFieldDeclarationVisitor.cs

@@ -46,13 +46,19 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
                                       CSharpTagHelperCodeRenderer.ExecutionContextVariableName,
                                       value: null);
 
-                    WritePrivateField(_tagHelperContext.RunnerTypeName,
+                    Writer
-                                      CSharpTagHelperCodeRenderer.RunnerVariableName,
+                        .Write("private ")
-                                      "new " + _tagHelperContext.RunnerTypeName + "()");
+                        .WriteVariableDeclaration(
+                        _tagHelperContext.RunnerTypeName,
+                        CSharpTagHelperCodeRenderer.RunnerVariableName,
+                        value: null);
 
-                    WritePrivateField(_tagHelperContext.ScopeManagerTypeName,
+                    Writer.Write("private ")
-                                      CSharpTagHelperCodeRenderer.ScopeManagerVariableName,
+                          .Write(_tagHelperContext.ScopeManagerTypeName)
-                                      "new " + _tagHelperContext.ScopeManagerTypeName + "()");
+                          .Write(" ")
+                          .WriteStartAssignment(CSharpTagHelperCodeRenderer.ScopeManagerVariableName)
+                          .WriteStartNewObject(_tagHelperContext.ScopeManagerTypeName)
+                          .WriteEndMethodInvocation();
                 }
             }
 

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpTagHelperRunnerInitializationVisitor.cs

@@ -0,0 +1,46 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
+{
+    /// <summary>
+    /// The <see cref="CodeVisitor{T}"/> that generates the code to initialize the TagHelperRunner.
+    /// </summary>
+    public class CSharpTagHelperRunnerInitializationVisitor : CodeVisitor<CSharpCodeWriter>
+    {
+        private readonly GeneratedTagHelperContext _tagHelperContext;
+        private bool _foundTagHelpers;
+
+        /// <summary>
+        /// Creates a new instance of <see cref="CSharpTagHelperRunnerInitializationVisitor"/>.
+        /// </summary>
+        /// <param name="writer">The <see cref="CSharpCodeWriter"/> used to generate code.</param>
+        /// <param name="context">The <see cref="CodeBuilderContext"/>.</param>
+        public CSharpTagHelperRunnerInitializationVisitor([NotNull] CSharpCodeWriter writer,
+                                                          [NotNull] CodeBuilderContext context)
+            : base(writer, context)
+        {
+            _tagHelperContext = Context.Host.GeneratedClassContext.GeneratedTagHelperContext;
+        }
+
+        /// <summary>
+        /// Writes the TagHelperRunner initialization code to the Writer.
+        /// </summary>
+        /// <param name="chunk">The <see cref="TagHelperChunk"/>.</param>
+        protected override void Visit(TagHelperChunk chunk)
+        {
+            if (!_foundTagHelpers && !Context.Host.DesignTimeMode)
+            {
+                _foundTagHelpers = true;
+
+                Writer
+                    .WriteStartAssignment(CSharpTagHelperCodeRenderer.RunnerVariableName)
+                    .Write(CSharpTagHelperCodeRenderer.RunnerVariableName)
+                    .Write(" ?? ")
+                    .WriteStartNewObject(_tagHelperContext.RunnerTypeName)
+                    .Write(_tagHelperContext.HtmlEncoderPropertyName)
+                    .WriteEndMethodInvocation();
+            }
+        }
+    }
+}

src/Microsoft.AspNet.Razor/Generator/GeneratedTagHelperContext.cs

@@ -35,6 +35,7 @@ namespace Microsoft.AspNet.Razor.Generator
             RunnerTypeName = "TagHelperRunner";
             ScopeManagerTypeName = "TagHelperScopeManager";
             ExecutionContextTypeName = "TagHelperExecutionContext";
+            HtmlEncoderPropertyName = "HtmlEncoder";
         }
 
         /// <summary>
@@ -150,5 +151,10 @@ namespace Microsoft.AspNet.Razor.Generator
         /// Contains information about in-scope tag helpers, HTML attributes, and the tag helpers' output.
         /// </remarks>
         public string ExecutionContextTypeName { get; set; }
+
+        /// <summary>
+        /// The name of the property used to encode HTML.
+        /// </summary>
+        public string HtmlEncoderPropertyName { get; set; }
     }
 }

test/Microsoft.AspNet.Razor.Runtime.Test/TagHelpers/NullHtmlEncoder.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.IO;
+using Microsoft.Framework.WebEncoders;
+
+namespace Microsoft.AspNet.Razor.Runtime.TagHelpers.Test
+{
+    public class NullHtmlEncoder : IHtmlEncoder
+    {
+        public string HtmlEncode(string value)
+        {
+            return value;
+        }
+
+        public void HtmlEncode(string value, int startIndex, int charCount, TextWriter output)
+        {
+            output.Write(value.Substring(startIndex, charCount));
+        }
+
+        public void HtmlEncode(char[] value, int startIndex, int charCount, TextWriter output)
+        {
+            output.Write(value, startIndex, charCount);
+        }
+    }
+}

test/Microsoft.AspNet.Razor.Runtime.Test/TagHelpers/PseudoHtmlEncoder.cs

@@ -0,0 +1,30 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.IO;
+using Microsoft.Framework.WebEncoders;
+
+namespace Microsoft.AspNet.Razor.Runtime.TagHelpers.Test
+{
+    public class PseudoHtmlEncoder : IHtmlEncoder
+    {
+        public string HtmlEncode(string value)
+        {
+            return "HtmlEncode[[" + value + "]]";
+        }
+
+        public void HtmlEncode(string value, int startIndex, int charCount, TextWriter output)
+        {
+            output.Write("HtmlEncode[[");
+            output.Write(value.Substring(startIndex, charCount));
+            output.Write("]]");
+        }
+
+        public void HtmlEncode(char[] value, int startIndex, int charCount, TextWriter output)
+        {
+            output.Write("HtmlEncode[[");
+            output.Write(value, startIndex, charCount);
+            output.Write("]]");
+        }
+    }
+}

test/Microsoft.AspNet.Razor.Runtime.Test/TagHelpers/TagHelperOutputTest.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
+using Microsoft.AspNet.Razor.Runtime.TagHelpers.Test;
 using Xunit;
 
 namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
@@ -79,7 +80,8 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
                 {
                     { "class", "btn" },
                     { "something", "   spaced    " }
-                });
+                },
+                htmlEncoder: new NullHtmlEncoder());
 
             // Act
             var output = tagHelperOutput.GenerateStartTag();
@@ -110,7 +112,8 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
                 {
                     { "class", "btn" },
                     { "something", "   spaced    " }
-                });
+                },
+                htmlEncoder: new NullHtmlEncoder());
 
             tagHelperOutput.SelfClosing = true;
 
@@ -136,6 +139,26 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
             Assert.Equal("<p />", output);
         }
 
+        [Fact]
+        public void GenerateStartTag_UsesProvidedHtmlEncoder()
+        {
+            // Arrange
+            var tagHelperOutput = new TagHelperOutput("p",
+                attributes: new Dictionary<string, string>
+                {
+                    { "hello", "world" },
+                },
+                htmlEncoder: new PseudoHtmlEncoder());
+
+            tagHelperOutput.SelfClosing = true;
+
+            // Act
+            var output = tagHelperOutput.GenerateStartTag();
+
+            // Assert
+            Assert.Equal("<p hello=\"HtmlEncode[[world]]\" />", output);
+        }
+
         [Fact]
         public void GenerateStartTag_ReturnsNothingIfWhitespaceTagName()
         {
@@ -145,7 +168,8 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
                 {
                     { "class", "btn" },
                     { "something", "   spaced    " }
-                })
+                },
+                htmlEncoder: new NullHtmlEncoder())
             {
                 SelfClosing = true
             };
@@ -402,7 +426,8 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
                 {
                     { "class", "btn" },
                     { "something", "   spaced    " }
-                })
+                },
+                htmlEncoder: new NullHtmlEncoder())
             {
                 PreContent = "Pre Content",
                 Content = "Content",
@@ -431,7 +456,8 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
                 attributes: new Dictionary<string, string>
                 {
                     { originalName, "btn" },
-                });
+                },
+                htmlEncoder: new NullHtmlEncoder());
 
             // Act
             tagHelperOutput.Attributes[updateName] = "super button";

test/Microsoft.AspNet.Razor.Runtime.Test/TagHelpers/TagHelperRunnerTest.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Threading.Tasks;
+using Microsoft.AspNet.Razor.Runtime.TagHelpers.Test;
 using Xunit;
 
 namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
@@ -61,7 +62,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
             int[] expectedTagHelperOrders)
         {
             // Arrange
-            var runner = new TagHelperRunner();
+            var runner = new TagHelperRunner(new NullHtmlEncoder());
             var executionContext = new TagHelperExecutionContext("p", selfClosing: false);
             var processOrder = new List<int>();
 
@@ -87,7 +88,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         public async Task RunAsync_SetTagHelperOutputSelfClosing(bool selfClosing)
         {
             // Arrange
-            var runner = new TagHelperRunner();
+            var runner = new TagHelperRunner(new NullHtmlEncoder());
             var executionContext = new TagHelperExecutionContext("p", selfClosing);
             var tagHelper = new TagHelperContextTouchingTagHelper();
 
@@ -105,7 +106,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         public async Task RunAsync_ProcessesAllTagHelpers()
         {
             // Arrange
-            var runner = new TagHelperRunner();
+            var runner = new TagHelperRunner(new NullHtmlEncoder());
             var executionContext = new TagHelperExecutionContext("p", selfClosing: false);
             var executableTagHelper1 = new ExecutableTagHelper();
             var executableTagHelper2 = new ExecutableTagHelper();
@@ -124,7 +125,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         public async Task RunAsync_AllowsModificationOfTagHelperOutput()
         {
             // Arrange
-            var runner = new TagHelperRunner();
+            var runner = new TagHelperRunner(new NullHtmlEncoder());
             var executionContext = new TagHelperExecutionContext("p", selfClosing: false);
             var executableTagHelper = new ExecutableTagHelper();
 
@@ -144,7 +145,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         public async Task RunAsync_AllowsDataRetrievalFromTagHelperContext()
         {
             // Arrange
-            var runner = new TagHelperRunner();
+            var runner = new TagHelperRunner(new NullHtmlEncoder());
             var executionContext = new TagHelperExecutionContext("p", selfClosing: false);
             var tagHelper = new TagHelperContextTouchingTagHelper();
 
@@ -161,7 +162,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         public async Task RunAsync_ConfiguresTagHelperContextWithExecutionContextsItems()
         {
             // Arrange
-            var runner = new TagHelperRunner();
+            var runner = new TagHelperRunner(new NullHtmlEncoder());
             var executionContext = new TagHelperExecutionContext("p", selfClosing: false);
             var tagHelper = new ContextInspectingTagHelper();
             executionContext.Add(tagHelper);
@@ -174,6 +175,22 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
             Assert.Same(tagHelper.ContextProcessedWith.Items, executionContext.Items);
         }
 
+        [Fact]
+        public async Task RunAsync_CreatesTagHelperOutput_WithProvidedEncoder()
+        {
+            // Arrange
+            var runner = new TagHelperRunner(new PseudoHtmlEncoder());
+            var executionContext = new TagHelperExecutionContext("p", selfClosing: true);
+            executionContext.AddHtmlAttribute("Hello", "World");
+
+            // Act
+            var tagHelperOutput = await runner.RunAsync(executionContext);
+            var output = tagHelperOutput.GenerateStartTag();
+
+            // Assert
+            Assert.Equal("<p Hello=\"HtmlEncode[[World]]\" />", output);
+        }
+
         private class ExecutableTagHelper : TagHelper
         {
             public bool Processed { get; set; }

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/BasicTagHelpers.CustomAttributeCodeGenerator.cs

@@ -11,7 +11,7 @@ namespace TestOutput
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private PTagHelper __PTagHelper = null;
         private InputTagHelper __InputTagHelper = null;
@@ -24,6 +24,7 @@ namespace TestOutput
         #pragma warning disable 1998
         public override async Task ExecuteAsync()
         {
+            __tagHelperRunner = __tagHelperRunner ?? new TagHelperRunner(HtmlEncoder);
             Instrumentation.BeginContext(33, 49, true);
             WriteLiteral("\r\n<div class=\"randomNonTagHelperAttribute\">\r\n    ");
             Instrumentation.EndContext();

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/BasicTagHelpers.Prefixed.cs

@@ -12,7 +12,7 @@ namespace TestOutput
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private PTagHelper __PTagHelper = null;
         private InputTagHelper __InputTagHelper = null;
@@ -25,6 +25,7 @@ namespace TestOutput
         #pragma warning disable 1998
         public override async Task ExecuteAsync()
         {
+            __tagHelperRunner = __tagHelperRunner ?? new TagHelperRunner(HtmlEncoder);
             Instrumentation.BeginContext(57, 52, true);
             WriteLiteral("\r\n<THSdiv class=\"randomNonTagHelperAttribute\">\r\n    ");
             Instrumentation.EndContext();

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/BasicTagHelpers.cs

@@ -12,7 +12,7 @@ namespace TestOutput
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private PTagHelper __PTagHelper = null;
         private InputTagHelper __InputTagHelper = null;
@@ -25,6 +25,7 @@ namespace TestOutput
         #pragma warning disable 1998
         public override async Task ExecuteAsync()
         {
+            __tagHelperRunner = __tagHelperRunner ?? new TagHelperRunner(HtmlEncoder);
             Instrumentation.BeginContext(33, 49, true);
             WriteLiteral("\r\n<div class=\"randomNonTagHelperAttribute\">\r\n    ");
             Instrumentation.EndContext();

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/ComplexTagHelpers.cs

@@ -12,7 +12,7 @@ namespace TestOutput
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private PTagHelper __PTagHelper = null;
         private InputTagHelper __InputTagHelper = null;
@@ -25,6 +25,7 @@ namespace TestOutput
         #pragma warning disable 1998
         public override async Task ExecuteAsync()
         {
+            __tagHelperRunner = __tagHelperRunner ?? new TagHelperRunner(HtmlEncoder);
             Instrumentation.BeginContext(33, 2, true);
             WriteLiteral("\r\n");
             Instrumentation.EndContext();

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/EmptyAttributeTagHelpers.cs

@@ -12,7 +12,7 @@ namespace TestOutput
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private InputTagHelper __InputTagHelper = null;
         private InputTagHelper2 __InputTagHelper2 = null;
@@ -25,6 +25,7 @@ namespace TestOutput
         #pragma warning disable 1998
         public override async Task ExecuteAsync()
         {
+            __tagHelperRunner = __tagHelperRunner ?? new TagHelperRunner(HtmlEncoder);
             Instrumentation.BeginContext(27, 13, true);
             WriteLiteral("\r\n<div>\r\n    ");
             Instrumentation.EndContext();

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/EscapedTagHelpers.cs

@@ -12,7 +12,7 @@ namespace TestOutput
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private InputTagHelper __InputTagHelper = null;
         private InputTagHelper2 __InputTagHelper2 = null;
@@ -24,6 +24,7 @@ namespace TestOutput
         #pragma warning disable 1998
         public override async Task ExecuteAsync()
         {
+            __tagHelperRunner = __tagHelperRunner ?? new TagHelperRunner(HtmlEncoder);
             Instrumentation.BeginContext(27, 72, true);
             WriteLiteral("\r\n<div class=\"randomNonTagHelperAttribute\">\r\n    <p class=\"Hello World\" ");
             Instrumentation.EndContext();

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/SingleTagHelper.cs

@@ -12,7 +12,7 @@ namespace TestOutput
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private PTagHelper __PTagHelper = null;
         #line hidden
@@ -23,6 +23,7 @@ namespace TestOutput
         #pragma warning disable 1998
         public override async Task ExecuteAsync()
         {
+            __tagHelperRunner = __tagHelperRunner ?? new TagHelperRunner(HtmlEncoder);
             Instrumentation.BeginContext(33, 2, true);
             WriteLiteral("\r\n");
             Instrumentation.EndContext();

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/TagHelpersInHelper.cs

@@ -120,7 +120,7 @@ Write(DateTime.Now);
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private MyTagHelper __MyTagHelper = null;
         private NestedTagHelper __NestedTagHelper = null;
@@ -132,6 +132,7 @@ Write(DateTime.Now);
         #pragma warning disable 1998
         public override async Task ExecuteAsync()
         {
+            __tagHelperRunner = __tagHelperRunner ?? new TagHelperRunner(HtmlEncoder);
             Instrumentation.BeginContext(33, 2, true);
             WriteLiteral("\r\n");
             Instrumentation.EndContext();

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/TagHelpersInSection.cs

@@ -11,7 +11,7 @@ namespace TestOutput
         private System.IO.TextWriter __tagHelperStringValueBuffer = null;
         #pragma warning restore 0414
         private TagHelperExecutionContext __tagHelperExecutionContext = null;
-        private TagHelperRunner __tagHelperRunner = new TagHelperRunner();
+        private TagHelperRunner __tagHelperRunner = null;
         private TagHelperScopeManager __tagHelperScopeManager = new TagHelperScopeManager();
         private MyTagHelper __MyTagHelper = null;
         private NestedTagHelper __NestedTagHelper = null;