private void btn_Listen_Click(object sender, EventArgs e)
        {
            LisThread = new Thread(new ThreadStart(BeginListern));//开线程执行BeginListern方法
            LisThread.Start();//线程开始执行
        }
        public IPAddress GetIP()
        {     /*获取本地服务器的ip地址  */
            IPHostEntry iep = Dns.GetHostEntry(Dns.GetHostName());
            IPAddress ip = iep.AddressList[0];
            return ip;
        }
        public void BeginListern()
        {
            LisSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//实例化Socket
            IPAddress ServerIp = GetIP();/*获取本地服务器的ip地址  */
            IPEndPoint iep = new IPEndPoint(ServerIp, port);

            LisSocket.Bind(iep); /*将Socket绑定ip */ 
            toolStripStatusLabel1.Text = iep.ToString() + "正在监听";
            LisSocket.Listen(50); //Socket开始监听
            newSocket = LisSocket.Accept();//获取连接请求的Socket
            /*接收客户端Socket所发的信息  */
            while (true)
            {
                try
                {
                    
                    byte[] byteMessage = new byte[100];
                  
                    newSocket.Receive(byteMessage);//接收信息
                    MessageBox.Show(Encoding.Default.GetString(byteMessage));
                    Control.CheckForIllegalCrossThreadCalls = false;
                    point = newSocket.RemoteEndPoint;//获取客户端的Socket的相关信息
                    IPEndPoint IPpoint = (IPEndPoint)point;
                    strmes+=IPpoint.Address.ToString()+ " " +DateTime.Now.ToString()+"说"+Encoding.Default.GetString(byteMessage).Trim(new char[] { '/0' })+"/r/n";
                    this.richTextBox1.Text=strmes;
                }
                catch (SocketException ex)
                {
                    toolStripStatusLabel1.Text += ex.ToString();
                }
            }
        }

        private void btn_Cancel_Click(object sender, EventArgs e)
        {
            try
            {
                LisSocket.Close();//关闭Socket
                LisThread.Abort();//线程停止
                LisThread=null;

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                Application.Exit();
            }
        }

        private void btn_Send_Click(object sender, EventArgs e)
        {
            byte[] byteData = Encoding.Default.GetBytes(this.richTextBox2.Text);
            newSocket.Send(byteData);//发送信息即由服务器往客户端上发信息
         
        }
    }
}

namespace WFAsynSoketClient
{
    public partial class Form1 : Form
    {
        public static  Socket ClientSocket;
        public Form1()
        {
            InitializeComponent();
        }
        /*往服务器上发送信息按钮事件*/
      private void btn_Send_Click(object sender, EventArgs e)
        {
            if (ClientSocket.Connected)//判断Socket是否已连接
            {

                byte[] SendMessage = new byte[100];
                SendMessage = Encoding.ASCII.GetBytes(this.richTextBox1.Text);
                ClientSocket.Send(SendMessage);//从数据中的指示位置开始将数据发送到连接的Socket。
                MessageBox.Show(Encoding.Default.GetString(SendMessage)+"发送成功!");
             
            }
            else
            {
                MessageBox.Show("未建立连接！");
            }
        }
      /*退出按钮*/
        private void btn_Cancel_Click(object sender, EventArgs e)
        {  
            
            ClientSocket.Shutdown(SocketShutdown.Both);//发送完成之后停止Socket
            ClientSocket.Close();//发送完成之后关闭Socket
            Application.Exit();

        }
        /*接收来自服务器上的信息*/
        public void targett()
        {
           this.toolStripStatusLabel1.Text = "已经建立连接准备接受数据";
           while (true)
            {
                byte[] bytes = new byte[100];
                int rev = ClientSocket.Receive(bytes,bytes.Length,0);//将数据从连接的   Socket   接收到接收缓冲区的特定位置。
                if (rev <= 0)
                {
                    break;
                }
                string strev = System.Text.Encoding.Default.GetString(bytes);
                this.textBox1.AppendText("服务器对客户端说:"+strev+"/r/n");
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           
        }
        /* 为客户端Socket建立连接到服务器*/
        private void button1_Click(object sender, EventArgs e)
        {
            ClientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            string ip = "192.168.1.26";//服务器ip
            IPAddress ipa = IPAddress.Parse(ip);
            IPEndPoint iep = new IPEndPoint(ipa, 8000);
            this.toolStripStatusLabel1.Text = "已经建立连接.";
            Control.CheckForIllegalCrossThreadCalls = false;
            try
            {
                ClientSocket.Connect(iep);//连接到服务器
                Thread thread = new Thread(new ThreadStart(targett));
                thread.Start(); 
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}