winform下UPD通信的简单应用

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.Sockets;
using System.Threading;
using System.Net;
using System.Net.Sockets;

namespace UDP
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//启动服务端
UdpClient udpServer;
delegate void SetTextCallBack(string text);
private void button1_Click(object sender, EventArgs e)
{
udpServer = new UdpClient(3000);
label2.Text = "服务器已启动..";
button1.Enabled = false;
Thread t = new Thread(new ThreadStart(ReceiveMsg));
t.IsBackground = true;
t.Start();

}

public void ReceiveMsg()
{
IPEndPoint ipe = new IPEndPoint(IPAddress.Any, 3000);
while (true)
{
byte[] buffer = udpServer.Receive(ref ipe);
string msg = Encoding.Unicode.GetString(buffer);
SetText(msg);
}

}
public void SetText(string text)
{
if (text == "")
{
if (richTextBox1.InvokeRequired)
{
SetTextCallBack st = new SetTextCallBack(SetText);
this.Invoke(st, new object[] { text });
}
else
{
richTextBox1.Text +="小万  " +DateTime.Now.ToString() + "\n" + " " + "\n";
}
}
else
{

if (richTextBox1.InvokeRequired)
{
SetTextCallBack st = new SetTextCallBack(SetText);
this.Invoke(st, new object[] { text });
}
else
{
richTextBox1.Text +="小万  " +DateTime.Now.ToString() + "\n" + text  + "\n";
}

}
}
//客户端
private void button2_Click(object sender, EventArgs e)
{
if (button1.Enabled ==true)
{
MessageBox.Show("服务端未开启！");
}
else
{
UdpClient client = new UdpClient();
string ip = textBox1.Text;
string msg = richTextBox2.Text;
byte[] buffer = Encoding.Unicode.GetBytes(msg);
IPEndPoint ips = new IPEndPoint(IPAddress.Parse(ip), 3000);
client.Send(buffer, buffer.Length, ips);
client.Close();
MessageBox.Show("发送成功！");
}

}

}
}