// 先講socket進行客戶端和服務(wù)器的書寫
 Socket socket;
 private void button1_Click(object sender, EventArgs e)
 {
     //參數(shù)1 ip地址類型 ipv4的類型
     //參數(shù)2 傳遞數(shù)據(jù)類型 數(shù)據(jù)報文類型
     //參數(shù)3 協(xié)議類型 udp協(xié)議
     //1 創(chuàng)建socket套接字作為服務(wù)器對象
     socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
     // 2綁定ip和端口
     IPAddress iPAddress = IPAddress.Parse("192.168.107.83");
     socket.Bind(new IPEndPoint(iPAddress,8081));
     //3 接受消息
     startReceive();
 }
    void startReceive()
  {
      //創(chuàng)建線程 開啟線程
      new Thread(() =>
      {
          byte[] body = new byte[1024];
          while (true)
          {
              
              int count =   socket.Receive(body); //接受數(shù)據(jù)
              string s = Encoding.UTF8.GetString(body, 0, count);
              richTextBox1.Invoke((Action)(() =>
              {
                  richTextBox1.AppendText(s + "\t\n");
                  richTextBox1.SelectionStart=richTextBox1.Text.Length;
                  richTextBox1.ScrollToCaret();
              }));
          }

      }).Start() ;
  }    

//發(fā)消息的方法 給指定的人發(fā)消息
string[] ips = new string[] {"192.168.107.83",  };
private void button2_Click(object sender, EventArgs e)
{
    socket.SendTo(Encoding.UTF8.GetBytes(this.textBox1.Text),
        new IPEndPoint(IPAddress.Parse("192.168.107.83"), 8082)
        );
}

        public Form1()
        {
            InitializeComponent();
            
        }
        void f1()
        {
            byte[] body = new byte[1024];
            while (true)
            {
                int count = socket.Receive(body); //接受數(shù)據(jù)
                string s = Encoding.UTF8.GetString(body, 0, count);
                richTextBox1.Invoke((Action)(() =>
                {
                    richTextBox1.AppendText(s + "\t\n");
                    richTextBox1.SelectionStart = richTextBox1.Text.Length;
                    richTextBox1.ScrollToCaret();
                }));
            }
        }
        // 打開連接
        Socket socket;
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                //1創(chuàng)建客戶端對象
                socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
                //bind 如果前后端寫的端口一致的時候 出現(xiàn)錯誤，端口號只能使用一次
                //2 綁定ip和端口號
               socket.Bind(new IPEndPoint(IPAddress.Parse("192.168.107.83"), 8082));
                Thread th = new Thread(f1);
                th.Start();
            }
            catch (Exception ex)
            {
                MessageBox.Show("端口號被占用");
            }

        }

        //發(fā)送消息
        private void button2_Click(object sender, EventArgs e)
        {
          
            if (socket != null)
            {
              
                //參數(shù)1 發(fā)送的字符串轉(zhuǎn)成字節(jié)數(shù)組
                //參數(shù)2 發(fā)送數(shù)據(jù)的遠程終端 new IPEndPoint(IPAddress.Parse("192.168.107.83"), 8081)
                socket.SendTo(Encoding.UTF8.GetBytes("倒反天罡"), new IPEndPoint(IPAddress.Parse("192.168.107.83"), 8081));
           }
        }

        //關(guān)閉
        private void button3_Click(object sender, EventArgs e)
        {
            socket.Close();//關(guān)閉
            socket = null;
        }