OnMahjongPacketReceive : MulticastDelegate, ICloneable, ISerializable
      (ctor) OnMahjongPacketReceive( object object, IntPtr method )
      virtual IAsyncResult BeginInvoke( MahjongGame game, NetState state, PacketReader pvSrc, AsyncCallback callback, object object )
      virtual void EndInvoke( IAsyncResult result )
      virtual void Invoke( MahjongGame game, NetState state, PacketReader pvSrc )