在發送數據之前，C＃UDP套接字不會接收數據

Question

我在使用C＃發送UDP數據的套接字時遇到問題 - 基本上套接字沒有從網絡上的其他計算機接收任何數據，直到首先通過套接字發送了一些數據。

不確定為什么它表現得很奇怪，我希望你們能指出我正確的方向 - 代碼示例如下。

謝謝

- 丹

private Socket UDPSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

IPAddress bindIP = BindingIP;
            if (bindIP == IPAddress.None)
                throw new Exception("Error binding to network interface \"" + _mcinter + "\" - interface not found");

            //recieve data from any source 
            IPEndPoint LocalHostIPEnd = new IPEndPoint(bindIP, Target_Port);

            //init Socket properties: 
            UDPSocket.SetSocketOption(SocketOptionLevel.Udp, SocketOptionName.NoDelay, 1);

            //allow for loopback testing 
            UDPSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);

            //extremly important to bind the Socket before joining multicast groups 
            UDPSocket.Bind(LocalHostIPEnd);

            //get in waiting mode for data - always (this doesn't halt code execution) 
            UDPSocket.BeginReceiveFrom(...);

Answer 1

沒關系，修好了

故事的寓意是---總是檢查防火牆是否啟用...