UdpClient Receive直到第二次广播才返回

Question

我认为这真的很奇怪。尝试使用UdpClient同步接收广播消息，但尽管广播已完成，但它不会返回。只有在随后的广播中才收到消息。我认为框架内某处有一个错误？

clientListener.BeginReceive(new AsyncCallback(RxBcastCallback), clientListener);
//this is passed as AsyncCall.AsyncState in the callback

.....

UdpClient udpListener = (UdpClient)AsyncCall.AsyncState;        

IPEndPoint remoteEndPt = new IPEndPoint(IPAddress.Any, 0);

byte[] inBuffer = udpListener.Receive(ref remoteEndPt); 
//does not return until subsequent broadcast

感谢， 肯尼

Answer 1

你的回调终点应该是：

UdpClient udpListener = (UdpClient)AsyncCall.AsyncState;
IPEndPoint e = (IPEndPoint)((UdpState)(AsyncCall.AsyncState)).e;
byte[] inBuffer= udpListener.EndReceive(AsyncCall, ref e);