Change FormValueProviderFactory to use GetContentType for media type matching

Fixes #68

src/Microsoft.AspNet.Mvc.ModelBinding/Formatters/TempInputFormatterProvider.cs

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
-using Microsoft.AspNet.Mvc.ModelBinding.Internal;
 
 namespace Microsoft.AspNet.Mvc.ModelBinding
 {

src/Microsoft.AspNet.Mvc.ModelBinding/Internal/ContentTypeHeaderValue.cs

@@ -1,12 +1,7 @@
-using System;
+
-using System.Collections.Generic;
+namespace Microsoft.AspNet.Mvc.ModelBinding
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Microsoft.AspNet.Mvc.ModelBinding.Internal
 {
-    public class ContentTypeHeaderValue
+    internal class ContentTypeHeaderValue
     {
         public ContentTypeHeaderValue([NotNull] string contentType,
                                       string charSet)
@@ -18,6 +13,5 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Internal
         public string ContentType { get; private set; }
 
         public string CharSet { get; set; }
-
     }
 }

src/Microsoft.AspNet.Mvc.ModelBinding/Internal/HttpRequestExtensions.cs

@@ -1,9 +1,9 @@
 using System;
 using Microsoft.AspNet.Abstractions;
 
-namespace Microsoft.AspNet.Mvc.ModelBinding.Internal
+namespace Microsoft.AspNet.Mvc.ModelBinding
 {
-    public static class HttpRequestExtensions
+    internal static class HttpRequestExtensions
     {
         private const string ContentTypeHeader = "Content-Type";
         private const string CharSetToken = "charset=";

src/Microsoft.AspNet.Mvc.ModelBinding/ValueProviders/FormValueProviderFactory.cs

@@ -25,9 +25,9 @@ namespace Microsoft.AspNet.Mvc.ModelBinding
 
         private bool IsSupportedContentType(HttpRequest request)
         {
-            var contentType = request.Headers["Content-Type"];
+            var contentType = request.GetContentType();
-            return !String.IsNullOrEmpty(contentType) && 
+            return contentType != null &&
-                   contentType.Equals(FormEncodedContentType, StringComparison.OrdinalIgnoreCase);
+                   contentType.ContentType.Equals(FormEncodedContentType, StringComparison.OrdinalIgnoreCase);
         }
 
         private static CultureInfo GetCultureInfo(HttpRequest request)

test/Microsoft.AspNet.Mvc.ModelBinding.Test/ValueProviders/FormValueProviderFactoryTests.cs

@@ -24,11 +24,13 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Test
             Assert.Null(result);
         }
 
-        [Fact]
+        [Theory]
-        public async Task GetValueProvider_ReturnsValueProviderInstaceWithInvariantCulture()
+        [InlineData("application/x-www-form-urlencoded")]
+        [InlineData("application/x-www-form-urlencoded;charset=utf-8")]
+        public async Task GetValueProvider_ReturnsValueProviderInstaceWithInvariantCulture(string contentType)
         {
             // Arrange
-            var requestContext = CreateRequestContext("application/x-www-form-urlencoded");
+            var requestContext = CreateRequestContext(contentType);
             var factory = new FormValueProviderFactory();
 
             // Act