using System;using System.Net;using System.Net.Sockets;using System.Text;using System.Threading;using System.Windows.Forms;namespace Client{ public partial class Form1 : Form { public Form1() { InitializeComponent(); CheckForIllegalCrossThreadCalls = false;//在其他线程中可以调用主窗体控件 } private bool flag = true;//定义一个bool变量，标识是否接收数据 private UdpClient udp;//创建UdpClient对象 private Thread thread;//创建线程对象 private void button1_Click(object sender, EventArgs e) { udp = new UdpClient(888);//使用端口号实例化UDP连接对象 flag = true;//标识接收数据 //创建IPEndPoint对象，用来显示响应主机的标识 IPEndPoint ipendpoint = new IPEndPoint(IPAddress.Any, 888); thread = new Thread(() =>//新开线程，执行接收数据操作 { while (flag)//如果标识为true { try { if (udp.Available <= 0) continue;//判断是否有网络数据 if (udp.Client == null) return;//判断连接是否为空 //调用UdpClient对象的Receive方法获得从远程主机返回的UDP数据报 byte[] bytes = udp.Receive(ref ipendpoint); //将获得的UDP数据报转换为字符串形式 string str = Encoding.Default.GetString(bytes); textBox2.Text = "正在接收信息：\n" + str;//显示正在接收的数据 textBox1.Text += "\n" + str;//显示接收的所有数据 } catch (Exception ex) { MessageBox.Show(ex.Message);//错误提示 } Thread.Sleep(1000);//线程休眠1秒 } }); thread.Start();//启动线程 } private void button2_Click(object sender, EventArgs e) { flag = false;//不接收数据 if (thread.ThreadState == ThreadState.Running)//判断线程是否运行 thread.Abort();//终止线程 udp.Close();//关闭连接 } private void Form1_Load(object sender, EventArgs e) { } private void textBox2_TextChanged(object sender, EventArgs e) { } private void textBox1_TextChanged(object sender, EventArgs e) { } }}
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