React to IFeatureColletion changes.

Author: Tratcher

src/Microsoft.AspNet.Server.WebListener/FeatureContext.cs

@@ -100,26 +100,26 @@ private Response Response
 
         private void PopulateFeatures()
         {
-            _features.Add(typeof(IHttpRequestFeature), this);
-            _features.Add(typeof(IHttpConnectionFeature), this);
-            _features.Add(typeof(IHttpResponseFeature), this);
-            _features.Add(typeof(IHttpSendFileFeature), this);
-            _features.Add(typeof(IHttpBufferingFeature), this);
-            _features.Add(typeof(IHttpRequestLifetimeFeature), this);
-            _features.Add(typeof(IHttpAuthenticationFeature), this);
-            _features.Add(typeof(IHttpRequestIdentifierFeature), this);
+            _features[typeof(IHttpRequestFeature)] = this;
+            _features[typeof(IHttpConnectionFeature)] = this;
+            _features[typeof(IHttpResponseFeature)] = this;
+            _features[typeof(IHttpSendFileFeature)] = this;
+            _features[typeof(IHttpBufferingFeature)] = this;
+            _features[typeof(IHttpRequestLifetimeFeature)] = this;
+            _features[typeof(IHttpAuthenticationFeature)] = this;
+            _features[typeof(IHttpRequestIdentifierFeature)] = this;
 
             if (Request.IsSecureConnection)
             {
-                _features.Add(typeof(ITlsConnectionFeature), this);
-                _features.Add(typeof(ITlsTokenBindingFeature), this);
+                _features[typeof(ITlsConnectionFeature)] = this;
+                _features[typeof(ITlsTokenBindingFeature)] = this;
             }
 
             // Win8+
             if (WebSocketHelpers.AreWebSocketsSupported)
             {
-                _features.Add(typeof(IHttpUpgradeFeature), this);
-                _features.Add(typeof(IHttpWebSocketFeature), this);
+                _features[typeof(IHttpUpgradeFeature)] = this;
+                _features[typeof(IHttpWebSocketFeature)] = this;
             }
         }