客戶端代碼

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Net; using System.Net.Sockets; using System.Text;namespace UDPTest {public partial class Form1 : Form{private UdpClient udpSend;public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){udpSend = new UdpClient();udpSend.EnableBroadcast = true;//是否可以發送和接收廣播IPEndPoint iep = new IPEndPoint(IPAddress.Parse("224.100.0.10"), 8001);byte[] data = Encoding.UTF8.GetBytes(richTextBox1.Text);udpSend.Send(data, data.Length, iep);richTextBox1.Clear();}} }

服務端代碼

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms;using System.Net; using System.Net.Sockets;namespace UDPTest2 {public partial class Form1 : Form{UdpClient udpReceive;public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){}private void Form1_Load(object sender, EventArgs e){byte[] data = null;udpReceive = new UdpClient(8001);udpReceive.JoinMulticastGroup(IPAddress.Parse("224.100.0.10"), 50);//添加到多路廣播組，50為路由器跳數IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0);while (true){data = udpReceive.Receive(ref iep);string str = Encoding.UTF8.GetString(data, 0, data.Length);MessageBox.Show(iep.ToString() + ":" + str);}}} }

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