//Socket基本编程 //服务端： using System.Net; using System.Net.Sockets; using System.Text; using System.Threading; Thread mythread ; Socket socket; // 清理所有正在使用的资源。 protected override void Dispose( bool disposing ) 
{ 
try 
{ socket.Close();//释放资源 mythread.Abort ( ) ;//中止线程 
} catch{ } if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); 
} public static IPAddress GetServerIP() { IPHostEntry ieh=Dns.GetHostByName(Dns.GetHostName()); return ieh.AddressList[0]; } private void BeginListen() { IPAddress ServerIp=GetServerIP(); IPEndPoint iep=new IPEndPoint(ServerIp,8000); socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); byte[] byteMessage=new byte[100]; this.label1.Text=iep.ToString(); socket.Bind(iep); // do while(true) { try { socket.Listen(5); Socket newSocket=socket.Accept(); newSocket.Receive(byteMessage); string sTime = DateTime.Now.ToShortTimeString ( ) ; string msg=sTime+":"+"Message from:"; msg+=newSocket.RemoteEndPoint.ToString()+Encoding.Default.GetString(byteMessage); this.listBox1.Items.Add(msg); } catch(SocketException ex) { this.label1.Text+=ex.ToString(); } } // while(byteMessage!=null); } //开始监听 private void button1_Click(object sender, System.EventArgs e) { try { mythread = new Thread(new ThreadStart(BeginListen)); mythread.Start(); } catch(System.Exception er) { MessageBox.Show(er.Message,"完成",MessageBoxButtons.OK,MessageBoxIcon.Stop); } } //客户端： using System.Net; using System.Net.Sockets; using System.Text; private void button1_Click(object sender, System.EventArgs e) { BeginSend(); } private void BeginSend() { string ip=this.txtip.Text; string port=this.txtport.Text; IPAddress serverIp=IPAddress.Parse(ip); int serverPort=Convert.ToInt32(port); IPEndPoint iep=new IPEndPoint(serverIp,serverPort); byte[] byteMessage; // do // { Socket socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); socket.Connect(iep); byteMessage=Encoding.ASCII.GetBytes(textBox1.Text); socket.Send(byteMessage); socket.Shutdown(SocketShutdown.Both); socket.Close(); // } // while(byteMessage!=null); } 基于TCP协议的发送和接收端 TCP协议的接收端 using System.Net.Sockets ; //使用到TcpListen类 using System.Threading ; //使用到线程 using System.IO ; //使用到StreamReader类 int port = 8000; //定义侦听端口号 private Thread thThreadRead; //创建线程，用以侦听端口号，接收信息 private TcpListener tlTcpListen; //侦听端口号 private bool blistener = true; //设定标示位，判断侦听状态 private NetworkStream nsStream; //创建接收的基本数据流 private StreamReader srRead; private System.Windows.Forms.StatusBar statusBar1; private System.Windows.Forms.Button button1; private System.Windows.Forms.ListBox listBox1; //从网络基础数据流中读取数据 private TcpClient tcClient ; private void Listen ( ) { try { tlTcpListen = new TcpListener ( port ) ; //以8000端口号来初始化TcpListener实例 tlTcpListen.Start ( ) ; //开始监听 statusBar1.Text = "正在监听" ; tcClient = tlTcpListen.AcceptTcpClient ( ) ; //通过TCP连接请求 nsStream = tcClient.GetStream ( ) ; //获取用以发送、接收数据的网络基础数据流 srRead=new StreamReader(nsStream);//以得到的网络基础数据流来初始化StreamReader实例 statusBar1.Text = "已经连接！"; while( blistener ) //循环侦听 { string sMessage = srRead.ReadLine();//从网络基础数据流中读取一行数据 if ( sMessage == "STOP" ) //判断是否为断开TCP连接控制码 { tlTcpListen.Stop(); //关闭侦听 nsStream.Close(); //释放资源 srRead.Close(); statusBar1.Text = "连接已经关闭！" ; thThreadRead.Abort(); //中止线程 return; } string sTime = DateTime.Now.ToShortTimeString ( ) ; //获取接收数据时的时间 listBox1.Items.Add ( sTime + " " + sMessage ) ; } } catch ( System.Security.SecurityException ) { MessageBox.Show ( "侦听失败！" , "错误" ) ; } } //开始监听 private void button1_Click(object sender, System.EventArgs e) { thThreadRead = new Thread ( new ThreadStart ( Listen ) ); thThreadRead.Start();//启动线程 button1.Enabled=false; } // 清理所有正在使用的资源。 protected override void Dispose( bool disposing ) { try { tlTcpListen.Stop(); //关闭侦听 nsStream.Close(); srRead.Close();//释放资源 thThreadRead.Abort();//中止线程 } catch{} if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } TCP协议的发送端 using System.Net.Sockets; //使用到TcpListen类 using System.Threading; //使用到线程 using System.IO; //使用到StreamWriter类 using System.Net; //使用IPAddress类、IPHostEntry类等 private StreamWriter swWriter; //用以向网络基础数据流传送数据 private NetworkStream nsStream; //创建发送数据的网络基础数据流 private TcpClient tcpClient; private System.Windows.Forms.Button button1; private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.Button button2; private System.Windows.Forms.TextBox textBox2; private System.Windows.Forms.StatusBar statusBar1; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; //通过它实现向远程主机提出TCP连接申请 private bool tcpConnect = false; //定义标识符，用以表示TCP连接是否建立 //连接 private void button1_Click(object sender, System.EventArgs e) { IPAddress ipRemote ; try { ipRemote = IPAddress.Parse ( textBox1.Text ) ; } catch //判断给定的IP地址的合法性 { MessageBox.Show ( "输入的IP地址不合法！" , "错误提示！" ) ; return ; } IPHostEntry ipHost ; try { ipHost = Dns.Resolve ( textBox1.Text ) ; } catch //判断IP地址对应主机是否在线 { MessageBox.Show ("远程主机不在线！" , "错误提示！" ) ; return ; } string sHostName = ipHost.HostName ; try { TcpClient tcpClient = new TcpClient(sHostName,8000);//对远程主机的8000端口提出TCP连接申请 nsStream = tcpClient.GetStream();//通过申请，并获取传送数据的网络基础数据流 swWriter = new StreamWriter(nsStream);//使用获取的网络基础数据流来初始化StreamWriter实例 button1.Enabled = false ; button2.Enabled = true ; tcpConnect = true ; statusBar1.Text = "已经连接！" ; } catch { MessageBox.Show ( "无法和远程主机8000端口建立连接！" , "错误提示！" ) ; return ; } } //发送 private void button2_Click(object sender, System.EventArgs e) { if (textBox2.Text !="") { swWriter.WriteLine(textBox2.Text);//刷新当前数据流中的数据 swWriter.Flush(); } else { MessageBox.Show("发送信息不能为空！","错误提示！"); } } // 清理所有正在使用的资源。 protected override void Dispose( bool disposing ) { if ( tcpConnect ) { swWriter.WriteLine ( "STOP" ) ; //发送控制码 swWriter.Flush (); //刷新当前数据流中的数据 nsStream.Close (); //清除资源 swWriter.Close (); } if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } 来源：https://www.cnblogs.com/HUMING9713/archive/2006/03/08/345859.html