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TcpClient
13                 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127.0.0.1
12                 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ipv6
15                         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 }