Added native support for the HTTP PATCH verb.

Author: TylerBrinkley

src/System.Net.Http/src/System/Net/Http/HttpClient.cs

@@ -351,6 +351,30 @@ public Task<HttpResponseMessage> PutAsync(Uri requestUri, HttpContent content,
             return SendAsync(request, cancellationToken);
         }
 
+        public Task<HttpResponseMessage> PatchAsync(string requestUri, HttpContent content)
+        {
+            return PatchAsync(CreateUri(requestUri), content);
+        }
+
+        public Task<HttpResponseMessage> PatchAsync(Uri requestUri, HttpContent content)
+        {
+            return PatchAsync(requestUri, content, CancellationToken.None);
+        }
+
+        public Task<HttpResponseMessage> PatchAsync(string requestUri, HttpContent content,
+            CancellationToken cancellationToken)
+        {
+            return PatchAsync(CreateUri(requestUri), content, cancellationToken);
+        }
+
+        public Task<HttpResponseMessage> PatchAsync(Uri requestUri, HttpContent content,
+            CancellationToken cancellationToken)
+        {
+            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Patch, requestUri);
+            request.Content = content;
+            return SendAsync(request, cancellationToken);
+        }
+
         public Task<HttpResponseMessage> DeleteAsync(string requestUri)
         {
             return DeleteAsync(CreateUri(requestUri));

src/System.Net.Http/src/System/Net/Http/HttpMethod.cs

@@ -18,6 +18,7 @@ public class HttpMethod : IEquatable<HttpMethod>
         private static readonly HttpMethod s_headMethod = new HttpMethod("HEAD");
         private static readonly HttpMethod s_optionsMethod = new HttpMethod("OPTIONS");
         private static readonly HttpMethod s_traceMethod = new HttpMethod("TRACE");
+        private static readonly HttpMethod s_patchMethod = new HttpMethod("PATCH");
 
         // Don't expose CONNECT as static property, since it's used by the transport to connect to a proxy.
         // CONNECT is not used by users directly.
@@ -57,6 +58,11 @@ public static HttpMethod Trace
             get { return s_traceMethod; }
         }
 
+        public static HttpMethod Patch
+        {
+            get { return s_patchMethod; }
+        }
+
         public string Method
         {
             get { return _method; }