Udp广播的发送与接收(C#＋UdpClient) 上篇

简介：

　　Udp广播消息用在局域网的消息传递很方便。本文使用UdpClient类在WPF下实现Udp广播收发

发送：

         void MainWindow_Loaded(object sender, RoutedEventArgs e)
         {
             Loaded -= MainWindow_Loaded;
             UdpClient client = new UdpClient(new IPEndPoint(IPAddress.Any, ));
             IPEndPoint endpoint = new IPEndPoint(IPAddress.Parse("255.255.255.255"), );//默认向全世界所有主机发送即可，路由器自动给你过滤，只发给局域网主机
             String ip = "host:" + Dns.GetHostEntry(Dns.GetHostName()).AddressList.Last().ToString();//对外广播本机的ip地址
             byte[] ipByte = Encoding.UTF8.GetBytes(ip);
             DispatcherTimer dt = new DispatcherTimer() { Interval = TimeSpan.FromSeconds() };//每隔1秒对外发送一次广播
             dt.Tick += delegate
             {
                 client.Send(ipByte, ipByte.Length, endpoint);
             };
             dt.Start();
         }

接收：

         void MainWindow_Loaded(object sender, RoutedEventArgs e)
         {
             Loaded -= MainWindow_Loaded;
             UdpClient client = new UdpClient(new IPEndPoint(IPAddress.Any, ));//端口要与发送端相同
             Thread thread = new Thread(receiveUdpMsg);//用线程接收，避免UI卡住
             thread.IsBackground = true;
             thread.Start(client);
         }
         void receiveUdpMsg(object obj)
         {
             UdpClient client = obj as UdpClient;
             IPEndPoint endpoint = new IPEndPoint(IPAddress.Any, );
             while (true)
             {
                 client.BeginReceive(delegate(IAsyncResult result) {
                     Console.WriteLine(result.AsyncState.ToString());//委托接收消息
                 }, Encoding.UTF8.GetString(client.Receive(ref endpoint)));
             }
         }

效果：