今天给大家来讲解下socket通信的原理，通常socket通信分为TCP，UDP两种不同的用法，我把两种方法都写出来了。

先看效果图：

 

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.Threading;namespace APP
{public partial class Form1 : Form{public Form1(){InitializeComponent();}/******************************************* * 利用Socket通讯，TCP和UDP的不同用法* TCP：面向连接，三次握手，数据安全性较高* UDP：面向无连接，数据易丢失，安全性不高* ******************************************///启动服务端Socket SocketUdp;Socket SocketTcp;delegate void SetTextCallBack(string text);

        //这个是启动服务端的按钮，在启动服务端后，会根据客户端发送回来的信息请求，自动将信息显示在文本框上private void button1_Click(object sender, EventArgs e){//UDP类型SocketUdp = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);EndPoint ep = new IPEndPoint(IPAddress.Any, 3000);SocketUdp.Bind(ep);//绑定本机IP和PortThread th = new Thread(new ThreadStart(ReceiveMsg));th.IsBackground = true;th.Start();label2.Text = "服务器已启动";button1.Enabled = false;////TCP类型//SocketTcp = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);//EndPoint ep = new IPEndPoint(IPAddress.Any, 3000);//SocketTcp.Bind(ep);//SocketTcp.Listen(2000);//Thread th = new Thread(new ThreadStart(ReceiveMsg));//th.IsBackground = true;//th.Start();//label2.Text = "服务器已启动";//button1.Enabled = false;}public void ReceiveMsg(){while (true){byte[] buffer = new byte[5555];EndPoint ep = new IPEndPoint(IPAddress.Any, 3000);int lea = SocketUdp.ReceiveFrom(buffer, ref ep);//接收远程;string msg = Encoding.Unicode.GetString(buffer, 0, lea);SetText(msg);}//while(true)//{//    Socket client = SocketTcp.Accept();//    byte[] buffer=new byte[1024];//    int lea = client.Receive(buffer);//接收远程;//    string msg = Encoding.Unicode.GetString(buffer, 0, lea);//    SetText(msg);//    client.Close();//}}public void SetText(string text){   

            //在这里，我强调一下，为什么我会用invoke呢，或许很多人对此不太了解，如果不用的话，会报错。我会另外抽时间给大家讲解下invoke,beigninvoke，多线程，委托与事件之间的联系的，反正大家先这么写着。if(richTextBox1.InvokeRequired){SetTextCallBack st = new SetTextCallBack(SetText);this.Invoke(st,new object[]{text});}else{richTextBox1.Text += DateTime.Now.ToString() + "\n" + text + "\n";}}//客户端private void button2_Click(object sender, EventArgs e){if (button1.Enabled ==true){MessageBox.Show("服务端未启动，请先启动服务器！");}else{string msg = richTextBox2.Text;string ip = textBox1.Text;//UDPSocket client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);byte[] buffer = Encoding.Unicode.GetBytes(msg);IPEndPoint ipe = new IPEndPoint(IPAddress.Parse(ip), 3000);client.SendTo(buffer, buffer.Length, SocketFlags.None, ipe);MessageBox.Show("发送成功！");////TCP//Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//IPEndPoint ipe = new IPEndPoint(IPAddress.Parse(ip), 3000);//client.Connect(ipe);//byte[] buffer = Encoding.Unicode.GetBytes(msg); //client.Send(buffer);//MessageBox.Show("发送成功！");}}}
}

好了，基本上的通信完成了。有什么不懂的问我。