c# - UdpClient Receive 直到第二次广播才返回

Question

我觉得这真的很奇怪。尝试使用UdpClient同步接收广播msg，但广播完成却没有返回。只有在随后的广播中，我才得到消息。我认为框架内的某处存在错误？

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

谢谢，肯尼

Answer 1

您的回调端点可能应该是：

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