简单的UDP收发讯息

发送：

                    try
                    {
                        Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);  //向此网段发广播包
                          int UDPListenerPort = 8082;
                        IPAddress broadcast = IPAddress.Parse("192.168.0.255"); //此处根据IP及子网掩码改为相应的广播IP
                        string ts = "This is UPD string for sending";
                        byte[] sendbuf = Encoding.ASCII.GetBytes(ts);
                        IPEndPoint ep = new IPEndPoint(broadcast, UDPListenerPort);
                        s.SendTo(sendbuf, ep);

                    }
                    catch (Exception e)
                    {}

接收：

 UdpClient listener;
            int UDPListenerPort = 8082;
            IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, UDPListenerPort);

            try
            {
                while (true)
                {
                    byte[] bytes = listener.Receive(ref groupEP);
                    string RecIP = groupEP.ToString().Substring(0, groupEP.ToString().IndexOf(":"));  //收到发送UPD端的IP
                    string RecStr = Encoding.ASCII.GetString(bytes, 0, bytes.Length);   //收到的UPD字符串
                }
            }
            catch
            {}