窗体（richTextBox右显示聊天）

步骤

点击链接按钮
         tcpclient客户端步骤
         1创建客户端对象
         2连接服务器connect
         3创建网络基础流发消息 .write发消息
         4 创建网络基础流接消息 .read接消息
         5 断开连接close()

窗体代码

namespace _02_心跳机制客户端
{public partial class Form1 : Form{public Form1(){InitializeComponent();}TcpClient client;private void button1_Click(object sender, EventArgs e){if (button1.Text == "连接"){try{client = new TcpClient();client.Connect(comboBox1.Text, int.Parse(comboBox2.Text));button1.Text = "断开";StartRead();HeartBeat();}catch (Exception ex){MessageBox.Show("连接失败");}}else{client.Close();timer.Stop();button1.Text = "连接";}}void StartRead(){byte[] bs = new byte[1024];Task.Run(() =>{try{while (true){int count = client.GetStream().Read(bs,0,bs.Length);string msg = Encoding.UTF8.GetString(bs, 0, count);richTextBox1.Invoke((Action)(() =>{richTextBox1.AppendText(msg + "\t\n");}));}}catch (Exception ex){button1.Text = "连接";}});}Timer timer;void HeartBeat(){timer = new Timer();timer.Interval = 10000;timer.Tick += Timer_Tick;timer.Start();}private void Timer_Tick(object sender, EventArgs e){client.GetStream().Write(new byte[] { 1 }, 0, 1);}private void button2_Click(object sender, EventArgs e){byte[] bs = Encoding.UTF8.GetBytes(textBox1.Text);byte[] bs1 = new byte[bs.Length + 1];bs1[0] = 0;bs.CopyTo(bs1,1);client.GetStream().Write(bs1, 0, bs1.Length) ;}}
}

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