C#编写UDP通信的方式

1.使用UDP的同步发送接收的方式，在本机上面实现数据的发生接收。

        UdpClient udpClient = null;
        UdpClient udpReceiver = null;

        Thread receiveThread;
        bool receiveThreadIsToRun=true;

        public Form1()
        {
            InitializeComponent();

            if (udpClient == null)
                udpClient = new UdpClient(8112);
            if (udpReceiver == null)
                udpReceiver = new UdpClient(8110, AddressFamily.InterNetwork);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            receiveThread = new Thread(new ThreadStart(receive));
            receiveThread.Start();
        }

        private void receive()
        {
            while (receiveThreadIsToRun)
            {
                if (udpReceiver != null)
                {
                    IPEndPoint remoteHost = null;
                    try
                    {
                        byte[] data = udpReceiver.Receive(ref remoteHost);
                        MessageBox.Show(Encoding.ASCII.GetString(data));
                    }
                    catch
                    {
                    }
                }
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            byte[] bytes = Encoding.ASCII.GetBytes("create new");
            udpClient.Send(bytes, bytes.Length, "127.0.0.1", 8110);
        }

 

 2.采用异步的方式来进行通信

        AsyncCallback udpReceiverStartCallback;

        UdpClient udpClient = null;
        UdpClient udpReceiver = null;

        public Form1()
        {
            InitializeComponent();

            if (udpClient == null)
                udpClient = new UdpClient(8112);
            if (udpReceiver == null)
                udpReceiver = new UdpClient(8110, AddressFamily.InterNetwork);

            //异步
            udpReceiverStartCallback = new AsyncCallback(updReceiverHander);
           


        }

        private void button1_Click(object sender, EventArgs e)
        {
            byte[] bytes = Encoding.ASCII.GetBytes("create new");
            udpReceiver.BeginReceive(udpReceiverStartCallback, udpClient);
            udpClient.Send(bytes, bytes.Length, "255.255.255.255", 8110);
        }

        private void updReceiverHander(IAsyncResult result)
        {
            if (result.IsCompleted)
            {
                IPEndPoint remoteHost = null;
                byte[] data = udpReceiver.EndReceive(result, ref remoteHost);
                MessageBox.Show(Encoding.ASCII.GetString(data) + "\r\n"+remoteHost.Address.ToString()+"\r\n"+remoteHost.Port.ToString());
            }
        }