如何实现C# Socket的多线程通信 - 问答

在C#中，使用Socket实现多线程通信可以通过创建一个服务器端和客户端并为每个连接创建单独的线程来完成。这里是一个简单的示例，展示了如何实现多线程Socket通信：

首先，创建一个服务器端：

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;

class Server
{
    private TcpListener _listener;

    public void Start(int port)
    {
        _listener = new TcpListener(IPAddress.Any, port);
        _listener.Start();

        Console.WriteLine("Server started on port: " + port);

        while (true)
        {
            // Accept incoming connections and create a new thread for each connection
            TcpClient client = _listener.AcceptTcpClient();
            Thread clientThread = new Thread(HandleClient);
            clientThread.Start(client);
        }
    }

    private void HandleClient(object obj)
    {
        TcpClient client = (TcpClient)obj;
        NetworkStream stream = client.GetStream();

        // Read and process data from the client
        byte[] buffer = new byte[256];
        int bytesRead = stream.Read(buffer, 0, buffer.Length);
        string receivedData = System.Text.Encoding.ASCII.GetString(buffer, 0, bytesRead);

        Console.WriteLine("Received data: " + receivedData);

        // Send response to the client
        string response = "Server received: " + receivedData;
        byte[] responseData = System.Text.Encoding.ASCII.GetBytes(response);
        stream.Write(responseData, 0, responseData.Length);

        // Close the connection
        stream.Close();
        client.Close();
    }
}

然后，创建一个客户端：

using System;
using System.Net.Sockets;

class Client
{
    public void Connect(string serverIp, int port)
    {
        TcpClient client = new TcpClient(serverIp, port);
        NetworkStream stream = client.GetStream();

        // Send data to the server
        string message = "Hello, Server!";
        byte[] data = System.Text.Encoding.ASCII.GetBytes(message);
        stream.Write(data, 0, data.Length);

        // Receive response from the server
        byte[] buffer = new byte[256];
        int bytesRead = stream.Read(buffer, 0, buffer.Length);
        string response = System.Text.Encoding.ASCII.GetString(buffer, 0, bytesRead);

        Console.WriteLine("Server response: " + response);

        // Close the connection
        stream.Close();
        client.Close();
    }
}

最后，在主程序中启动服务器和客户端：

using System;
using System.Threading;

class Program
{
    static void Main(string[] args)
    {
        // Start the server
        Server server = new Server();
        Thread serverThread = new Thread(() => server.Start(8000));
        serverThread.Start();

        // Give the server some time to start
        Thread.Sleep(1000);

        // Connect the client
        Client client = new Client();
        client.Connect("127.0.0.1", 8000);

        Console.ReadLine();
    }
}

这个示例中，服务器监听指定端口上的连接请求，并为每个连接创建一个新线程。客户端连接到服务器并发送一条消息，然后接收服务器的响应。这种方法可以轻松地扩展到处理多个客户端连接。

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