Expose GetName extension on IFormFile

Author: khellang

src/Microsoft.AspNet.Http/FormFileCollection.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
-using Microsoft.Net.Http.Headers;
 
 namespace Microsoft.AspNet.Http.Internal
 {
@@ -15,20 +14,12 @@ public IFormFile this[string name]
 
         public IFormFile GetFile(string name)
         {
-            return Find(file => string.Equals(name, GetName(file.ContentDisposition)));
+            return Find(file => string.Equals(name, file.GetName()));
         }
 
         public IReadOnlyList<IFormFile> GetFiles(string name)
         {
-            return FindAll(file => string.Equals(name, GetName(file.ContentDisposition)));
-        }
-
-        private static string GetName(string contentDisposition)
-        {
-            // Content-Disposition: form-data; name="myfile1"; filename="Misc 002.jpg"
-            ContentDispositionHeaderValue cd;
-            ContentDispositionHeaderValue.TryParse(contentDisposition, out cd);
-            return HeaderUtilities.RemoveQuotes(cd?.Name);
+            return FindAll(file => string.Equals(name, file.GetName()));
         }
     }
 }

src/Microsoft.AspNet.Http/FormFileExtensions.cs

@@ -0,0 +1,19 @@
+using Microsoft.Net.Http.Headers;
+
+namespace Microsoft.AspNet.Http
+{
+    public static class FormFileExtensions
+    {
+        public static string GetName(this IFormFile file)
+        {
+            // Content-Disposition: form-data; name="myfile1"; filename="Misc 002.jpg"
+            ContentDispositionHeaderValue cd;
+            if (ContentDispositionHeaderValue.TryParse(file.ContentDisposition, out cd))
+            {
+                return HeaderUtilities.RemoveQuotes(cd.Name);
+            }
+
+            return string.Empty;
+        }
+    }
+}