客戶端：

 

     private void Form1_Load(object sender, EventArgs e)
        {
            //得到本機地址
            IPHostEntry ieh = Dns.GetHostEntry(Dns.GetHostName());
            txtIP.Text = ieh.AddressList[0].ToString();
        }
        private void btn_Send_Click(object sender, EventArgs e)
        {
            BeginSend();
        }
        //發(fā)送信息
        private void BeginSend()
        {
            string ip = txtIP.Text;
            string port = txtPort.Text;
            string msg = txtMsg.Text.Trim();
           
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            IPAddress serverIp = IPAddress.Parse(ip);
            int serverPort = Convert.ToInt32(port);
            IPEndPoint iep = new IPEndPoint(serverIp, serverPort);                       
            socket.Connect(iep);

            byte[] byteMessage;
            byteMessage = Encoding.ASCII.GetBytes(msg);
            socket.Send(byteMessage);
            socket.Shutdown(SocketShutdown.Both);
            socket.Close();           
        }       

 

 

 

 

 

服務(wù)端：

 

 

     private void btn_Listen_Click(object sender, EventArgs e)
        {
            try
            {
                mythread = new Thread(new ThreadStart(BeginListen));
                mythread.Start();
            }
            catch (System.Exception er)
            {
                MessageBox.Show(er.Message, "完成", MessageBoxButtons.OK, MessageBoxIcon.Stop);
            }
        }
        //獲取本機IP地址
        public static IPAddress GetServerIP()
        {
            IPHostEntry ieh = Dns.GetHostEntry(Dns.GetHostName());
            return ieh.AddressList[0];
        }
        //監(jiān)聽
        private void BeginListen()
        {           
            socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                       
            IPAddress ServerIp = GetServerIP();
            IPEndPoint iep = new IPEndPoint(ServerIp, port);
            socket.Bind(iep);

            toolStripStatusLabel1.Text = iep.ToString() + "正在監(jiān)聽...";
            byte[] byteMessage = new byte[100];
            while (true)
            {
                try
                {
                    socket.Listen(5);
                    Socket newSocket = socket.Accept();
                    newSocket.Receive(byteMessage);

                    string sTime = DateTime.Now.ToShortTimeString();
                    string msg = sTime + "-" + "信息來自：";
                    msg += newSocket.RemoteEndPoint.ToString() +" "+ Encoding.Default.GetString(byteMessage).Trim(new char[] {'\0'});
                    richTextBox1.AppendText(msg + "\r\n");
                }
                catch (SocketException ex)
                {
                    toolStripStatusLabel1.Text += ex.ToString();
                }
            }           
        }