window8 store应用程序DatagramSocket 与桌面应用UDPClient通信，收不到数据

[android_qhdxuan]

var g = new DatagramSocket();
g.MessageReceived += g_MessageReceived;
// g.BindEndpointAsync(new HostName("127.0.0.1"), "6700");
g.BindServiceNameAsync(Port);
.
.
void g_MessageReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
{ // <- break point here.此处打了个断点

}
但当桌面应用程序使用UDPClient发送数据后，MessageReceived事件始终没有触发。不知道什么原因。