CR use section ContentDisposition and ContentType

Author: benaadams

src/Microsoft.AspNet.Http/Features/FormFeature.cs

@@ -144,17 +144,16 @@ private async Task<IFormCollection> InnerReadFormAsync(CancellationToken cancell
                     var section = await multipartReader.ReadNextSectionAsync(cancellationToken);
                     while (section != null)
                     {
-                        var headers = section.Headers;
                         ContentDispositionHeaderValue contentDisposition;
-                        ContentDispositionHeaderValue.TryParse(headers[HeaderNames.ContentDisposition], out contentDisposition);
+                        ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out contentDisposition);
                         if (HasFileContentDisposition(contentDisposition))
                         {
                             // Find the end
                             await section.Body.DrainAsync(cancellationToken);
 
                             var file = new FormFile(_request.Body, section.BaseStreamOffset.Value, section.Body.Length)
                             {
-                                Headers = new HeaderDictionary(headers),
+                                Headers = new HeaderDictionary(section.Headers),
                             };
                             if (files == null)
                             {
@@ -170,7 +169,7 @@ private async Task<IFormCollection> InnerReadFormAsync(CancellationToken cancell
 
                             var key = HeaderUtilities.RemoveQuotes(contentDisposition.Name);
                             MediaTypeHeaderValue mediaType;
-                            MediaTypeHeaderValue.TryParse(headers[HeaderNames.ContentType], out mediaType);
+                            MediaTypeHeaderValue.TryParse(section.ContentType, out mediaType);
                             var encoding = FilterEncoding(mediaType?.Encoding);
                             using (var reader = new StreamReader(section.Body, encoding, detectEncodingFromByteOrderMarks: true, bufferSize: 1024, leaveOpen: true))
                             {
@@ -180,7 +179,7 @@ private async Task<IFormCollection> InnerReadFormAsync(CancellationToken cancell
                         }
                         else
                         {
-                            System.Diagnostics.Debug.Assert(false, "Unrecognized content-disposition for this section: " + headers[HeaderNames.ContentDisposition]);
+                            System.Diagnostics.Debug.Assert(false, "Unrecognized content-disposition for this section: " + section.ContentDisposition);
                         }
 
                         section = await multipartReader.ReadNextSectionAsync(cancellationToken);