Fix for pull request #113

Example/Program.cs

@@ -35,7 +35,7 @@ namespace Example
           nf.Notify (
             new NotificationMessage {
               Summary = "WebSocket Message",
-              Body = e.Data,
+              Body = e.Type != Opcode.Ping ? e.Data : "Received a Ping.",
               Icon = "notification-message-im"
             });
 
@@ -61,6 +61,9 @@ namespace Example
 
         // To change the wait time for the response to the Ping or Close.
         ws.WaitTime = TimeSpan.FromSeconds (10);
+
+        // To emit a WebSocket.OnMessage event when receives a Ping.
+        ws.EmitOnPing = true;
 #endif
         // To enable the Per-message Compression extension.
         //ws.Compression = CompressionMethod.Deflate;

websocket-sharp/MessageEventArgs.cs

@@ -37,11 +37,12 @@ namespace WebSocketSharp
   /// <remarks>
   ///   <para>
   ///   A <see cref="WebSocket.OnMessage"/> event occurs when the <see cref="WebSocket"/> receives
-  ///   a text or binary message.
+  ///   a text or binary message, or a Ping if the <see cref="WebSocket.EmitOnPing"/> property is
+  ///   set to <c>true</c>.
   ///   </para>
   ///   <para>
-  ///   If you would like to get the message data, you should access
-  ///   the <see cref="MessageEventArgs.Data"/> or <see cref="MessageEventArgs.RawData"/> property.
+  ///   If you would like to get the message data, you should access the <see cref="Data"/> or
+  ///   <see cref="RawData"/> property.
   ///   </para>
   /// </remarks>
   public class MessageEventArgs : EventArgs
@@ -113,7 +114,7 @@ namespace WebSocketSharp
     /// Gets the type of the message.
     /// </summary>
     /// <value>
-    /// <see cref="Opcode.Text"/> or <see cref="Opcode.Binary"/>.
+    /// <see cref="Opcode.Text"/>, <see cref="Opcode.Binary"/>, or <see cref="Opcode.Ping"/>.
     /// </value>
     public Opcode Type {
       get {

websocket-sharp/WebSocket.cs

@@ -76,6 +76,7 @@ namespace WebSocketSharp
     private WebSocketContext        _context;
     private CookieCollection        _cookies;
     private NetworkCredential       _credentials;
+    private bool                    _emitOnPing;
     private bool                    _enableRedirection;
     private string                  _extensions;
     private AutoResetEvent          _exitReceiving;
@@ -308,6 +309,24 @@ namespace WebSocketSharp
       }
     }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether the <see cref="WebSocket"/> emits
+    /// a <see cref="OnMessage"/> event when receives a Ping.
+    /// </summary>
+    /// <value>
+    /// <c>true</c> if the <see cref="WebSocket"/> emits a <see cref="OnMessage"/> event
+    /// when receives a Ping; otherwise, <c>false</c>. The default value is <c>false</c>.
+    /// </value>
+    public bool EmitOnPing {
+      get {
+        return _emitOnPing;
+      }
+
+      set {
+        _emitOnPing = value;
+      }
+    }
+
     /// <summary>
     /// Gets or sets a value indicating whether the <see cref="WebSocket"/> redirects to
     /// the new URL located in the handshake response.
@@ -1001,6 +1020,9 @@ namespace WebSocketSharp
       if (send (new WebSocketFrame (Opcode.Pong, frame.PayloadData, _client).ToByteArray ()))
         _logger.Trace ("Returned a Pong.");
 
+      if (_emitOnPing)
+        enqueueToMessageEventQueue (new MessageEventArgs (frame));
+
       return true;
     }
 
@@ -1399,7 +1421,7 @@ namespace WebSocketSharp
           if (processReceivedFrame (frame) && _readyState != WebSocketState.Closed) {
             receive ();
 
-            if (frame.IsControl || !frame.IsFinal)
+            if ((frame.IsControl && !(frame.IsPing && _emitOnPing)) || !frame.IsFinal)
               return;
 
             lock (_forEvent) {