Addressed code review comments.

Author: N. Taylor Mullen

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

@@ -11,12 +11,12 @@ namespace Microsoft.AspNet.Mvc.Razor
     public class GeneratedTagHelperAttributeContext
     {
         /// <summary>
-        /// String representation of the model expression type.
+        /// Name of the model expression type.
         /// </summary>
         public string ModelExpressionTypeName { get; set; }
 
         /// <summary>
-        /// String representation of a method to create model expression types.
+        /// Name the method to create <c>ModelExpression</c>s.
         /// </summary>
         public string CreateModelExpressionMethodName { get; set; }
     }

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

@@ -16,9 +16,9 @@ public class MvcCSharpCodeBuilder : CSharpCodeBuilder
         private readonly string _activateAttribute;
 
         public MvcCSharpCodeBuilder([NotNull] CodeBuilderContext context,
-                                    [NotNull] GeneratedTagHelperAttributeContext tagHelperAttributeContext,
                                     [NotNull] string defaultModel,
-                                    [NotNull] string activateAttribute)
+                                    [NotNull] string activateAttribute,
+                                    [NotNull] GeneratedTagHelperAttributeContext tagHelperAttributeContext)
             : base(context)
         {
             _tagHelperAttributeContext = tagHelperAttributeContext;

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

@@ -191,13 +191,13 @@ public override CodeBuilder DecorateCodeBuilder([NotNull] CodeBuilder incomingBu
             UpdateCodeBuilder(context);
 
             return new MvcCSharpCodeBuilder(context,
+                                            DefaultModel, 
+                                            ActivateAttribute,
                                             new GeneratedTagHelperAttributeContext
                                             {
                                                 ModelExpressionTypeName = ModelExpressionType,
                                                 CreateModelExpressionMethodName = CreateModelExpressionMethod
-                                            },
-                                            DefaultModel, 
-                                            ActivateAttribute);
+                                            });
         }
 
         private void UpdateCodeBuilder(CodeGeneratorContext context)

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

@@ -31,7 +31,7 @@ public MvcTagHelperAttributeValueCodeRenderer([NotNull] GeneratedTagHelperAttrib
         /// </remarks>
         public override void RenderAttributeValue([NotNull] TagHelperAttributeDescriptor attributeDescriptor,
                                                   [NotNull] CSharpCodeWriter writer,
-                                                  [NotNull] CodeBuilderContext context,
+                                                  [NotNull] CodeBuilderContext codeBuilderContext,
                                                   [NotNull] Action<CSharpCodeWriter> renderAttributeValue)
         {
             var propertyType = attributeDescriptor.PropertyInfo.PropertyType;
@@ -44,14 +44,13 @@ public override void RenderAttributeValue([NotNull] TagHelperAttributeDescriptor
                       .Write(ModelLambdaVariableName)
                       .Write(".");
 
-                // TODO: Enable intellisense for ModelExpressions in https://github.com/aspnet/Mvc/issues/1252.
                 renderAttributeValue(writer);
 
                 writer.WriteEndMethodInvocation(endLine: false);
             }
             else
             {
-                base.RenderAttributeValue(attributeDescriptor, writer, context, renderAttributeValue);
+                base.RenderAttributeValue(attributeDescriptor, writer, codeBuilderContext, renderAttributeValue);
             }
         }
     }

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

@@ -0,0 +1,13 @@
+// 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 Microsoft.AspNet.Mvc.Rendering;
+using Microsoft.AspNet.Razor.Runtime.TagHelpers;
+
+namespace Microsoft.AspNet.Mvc.Razor
+{
+    public class InputTestTagHelper : TagHelper
+    {
+        public ModelExpression For { get; set; }
+    }
+}

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

@@ -0,0 +1,10 @@
+// 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.Mvc.Rendering
+{
+    // This is here to mimic the real ModelExpression type defined in Microsoft.AspNet.Mvc.Core.
+    public class ModelExpression
+    {
+    }
+}