只有5个客户端的c#的网络编程

在C#中进行网络编程可以通过使用.NET Framework提供的Socket类来实现。以下是一个简单的例子，假设你要实现一个基于TCP协议的服务器和客户端，服务器只需支持5个客户端连接。

服务器端

服务器端代码如下：

csharp
复制代码
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;

public class Server
{
    private TcpListener tcpListener;
    private Thread listenThread;
    private int clientCount = 0; // 记录客户端连接数

    public Server()
    {
        this.tcpListener = new TcpListener(IPAddress.Any, 12345); // 监听本地IP地址的12345端口
        this.listenThread = new Thread(new ThreadStart(ListenForClients));
        this.listenThread.Start();
    }

    private void ListenForClients()
    {
        this.tcpListener.Start();

        while (clientCount < 5) // 只允许5个客户端连接
        {
            TcpClient client = this.tcpListener.AcceptTcpClient();
            clientCount++;
            Console.WriteLine($"Client {clientCount} connected.");

            Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
            clientThread.Start(client);
        }
    }

    private void HandleClientComm(object client)
    {
        TcpClient tcpClient = (TcpClient)client;
        NetworkStream clientStream = tcpClient.GetStream();

        byte[] message = new byte[4096];
        int bytesRead;

        while ((bytesRead = clientStream.Read(message, 0, 4096)) != 0)
        {
            // 处理客户端发送的数据，这里只是简单地输出到控制台
            Console.WriteLine($"Received: {System.Text.Encoding.ASCII.GetString(message, 0, bytesRead)}");
            clientStream.Write(message, 0, bytesRead);
        }

        tcpClient.Close();
    }
    
    public static void Main()
    {
        Server server = new Server();
    }
}

客户端

客户端代码如下：

csharp
复制代码
using System;
using System.Net.Sockets;

public class Client
{
    public void Connect(string server, string message)
    {
        try
        {
            TcpClient client = new TcpClient(server, 12345);

            byte[] data = System.Text.Encoding.ASCII.GetBytes(message);
            NetworkStream stream = client.GetStream();

            stream.Write(data, 0, data.Length);

            byte[] responseData = new byte[4096];
            int bytesRead = stream.Read(responseData, 0, 4096);
            string response = System.Text.Encoding.ASCII.GetString(responseData, 0, bytesRead);
            Console.WriteLine("Received: " + response);

            stream.Close();
            client.Close();
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception: " + e.Message);
        }
    }
    
    public static void Main()
    {
        Client client = new Client();
        client.Connect("127.0.0.1", "Hello from client!");
    }
}

说明

• 服务器端：使用TcpListener监听端口，通过AcceptTcpClient()接受客户端连接。在ListenForClients()方法中，通过while循环控制最多允许5个客户端连接，并为每个连接创建一个新的线程来处理通信。

• 客户端：使用TcpClient连接服务器，发送数据并接收响应。Connect()方法中，创建一个TcpClient实例连接到指定的服务器地址和端口。

关键字

C#, .NET Framework, Socket, TcpListener, TcpClient, NetworkStream, 多线程