C#中实现TCP通信使用`System.Net.Sockets`命名空间提供的类库

```csharp// 服务器端代码using System;using System.Net;using System.Net.Sockets;using System.Text;

class TcpServer{ static void Main() { // 服务器监听的IP地址和端口号 IPAddress ipAddress = IPAddress.Parse("127.0.0.1"); int port = 8888;

 // 创建一个TCP监听器 TcpListener listener = new TcpListener(ipAddress, port); listener.Start(); Console.WriteLine("服务器已启动，等待客户端连接...");

 // 等待客户端连接 TcpClient client = listener.AcceptTcpClient(); Console.WriteLine("客户端已连接");

 // 获取网络流 NetworkStream stream = client.GetStream();

 // 读取客户端发送的数据 byte[] buffer = new byte[1024]; int bytesRead = stream.Read(buffer, 0, buffer.Length); string dataReceived = Encoding.ASCII.GetString(buffer, 0, bytesRead); Console.WriteLine("收到客户端消息：" + dataReceived);

 // 向客户端发送响应数据 string responseData = "Hello from server"; byte[] data = Encoding.ASCII.GetBytes(responseData); stream.Write(data, 0, data.Length); Console.WriteLine("向客户端发送消息：" + responseData);

 // 关闭连接 client.Close(); listener.Stop();

 Console.WriteLine("服务器已关闭"); }}```

```csharp// 客户端代码using System;using System.Net;using System.Net.Sockets;using System.Text;

class TcpClient{ static void Main() { // 服务器的IP地址和端口号 string serverIp = "127.0.0.1"; int serverPort = 8888;

 // 创建TCP客户端 TcpClient client = new TcpClient();

 // 连接服务器 client.Connect(serverIp, serverPort);

 // 获取网络流 NetworkStream stream = client.GetStream();

 // 向服务器发送数据 string message = "Hello from client"; byte[] data = Encoding.ASCII.GetBytes(message); stream.Write(data, 0, data.Length); Console.WriteLine("向服务器发送消息：" + message);

 // 读取服务器响应数据 byte[] buffer = new byte[1024]; int bytesRead = stream.Read(buffer, 0, buffer.Length); string responseData = Encoding.ASCII.GetString(buffer, 0, bytesRead); Console.WriteLine("收到服务器消息：" + responseData);

 // 关闭连接 client.Close();

 Console.WriteLine("客户端已关闭"); }}```