需要引用 using System.Net;

using System.Net.Sockets;

1 namespace TCPServer { 2     class Program { 3         static void Main(string[] args) { 4             int port = 888;//端口 5             TcpClient tcpClient;//创建TCP连接对象(存入客服端所链接) 6             IPAddress[] serverIP= Dns.GetHostAddresses("127.0.0.1");//定义IP地址 7             IPAddress localAddres = serverIP[0];//Ip地址； 8             TcpListener tcpListener = new TcpListener(localAddres, port);//监听套接字 9             tcpListener.Start();//开始监听10             Console.WriteLine("服务器启动成功，等待用户接入。。。");//输出信息11             try {12                 tcpClient = tcpListener.AcceptTcpClient();//每接收一个客服端生成一个TcpClient13                 NetworkStream networkStream = tcpClient.GetStream();//获取网络数据流14                 BinaryReader reader = new BinaryReader(networkStream);//定义数据读取对象15                 BinaryWriter writer = new BinaryWriter(networkStream);//定义数据写入对象16                 while(true) {17                     try {18                         string strReader = reader.ReadString();//接收消息19                         string[] strReaders = strReader.Split(new char[] { ' ' });//截取客服端信息20                         Console.WriteLine("有客服端接入，客户IP：" + strReaders[0]);//输出接收客服端IP地址21                         string strWriter = "我是服务器，欢迎光临";//定义服务端要写的内容22                         Console.WriteLine("来自客服端的消息：" + strReaders[1]);//输出接收的消息23                         writer.Write(strWriter);//向对方发送消息24                     }25                     catch {26                         break;27                     }28                 }29             }30             catch {31                 Console.WriteLine("接收数据失败");32             }33 34         }35     }36 }

1 namespace TCPClient { 2     class Program { 3         static void Main(string[] args) { 4             TcpClient tcpClient = new TcpClient();//创建一个TcpClient对象，自动分配主机IP地址和端口号 5             tcpClient.Connect("127.0.0.1", 888);//连接服务器，其IP和端口号为127.0.0.1和888 6             if (tcpClient != null) { 7                 Console.WriteLine("连接服务器成功"); 8                 NetworkStream networkStream = tcpClient.GetStream();//获取网络数据流 9                 BinaryReader reader = new BinaryReader(networkStream);//定义数据读取对象10                 BinaryWriter writer = new BinaryWriter(networkStream);//定义数据写入对象11                 string localip = "127.0.0.1";//存储本机IP，默认值为127.0.0.112                 IPAddress[] ips = Dns.GetHostAddresses(Dns.GetHostName());//获取所有Ip地址13                 foreach (var item in ips) {14                     if (!item.IsIPv6SiteLocal)//如果不是ipv615                         localip = item.ToString();16                 }17                 writer.Write(localip + " 你好服务器，我是客服端");//向服务器发送消息18                 while (true) {19                     try {20                         string strReader = reader.ReadString();//接收服务器发送的数据21                         if(strReader!=null) {22                             Console.WriteLine("来自服务器的消息：" + strReader);//输出接收服务器的消息23                         }24                     }25                     catch {26                         break;//出错退出循环27                     }28                 }29             }30             else {31                 Console.WriteLine("连接服务器错误");32             }33         }34     }35 }

上述代码，通俗易懂，注释详细，适合小白学习。