c# beginreceive怎样处理并发连接

在C#中，处理并发连接通常涉及到使用异步编程模型。BeginReceive 方法是异步接收数据的关键，它可以让你在等待数据到达时执行其他任务。以下是一个简单的示例，展示了如何使用 BeginReceive 处理并发连接：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

class ConcurrentServer
{
    private const int Port = 8080;
    private const int BufferSize = 1024;

    private TcpListener _listener;

    public ConcurrentServer()
    {
        _listener = new TcpListener(IPAddress.Any, Port);
    }

    public void Start()
    {
        _listener.Start();
        Console.WriteLine("Server started on port " + Port);

        Task.Run(() => AcceptClients());
    }

    private async Task AcceptClients()
    {
        while (true)
        {
            var client = await _listener.AcceptTcpClientAsync();
            Console.WriteLine("Client connected: " + client.Client.RemoteEndPoint);

            // Handle the client connection in a separate task
            _ = HandleClientAsync(client);
        }
    }

    private async Task HandleClientAsync(TcpClient client)
    {
        var stream = client.GetStream();
        byte[] buffer = new byte[BufferSize];

        while (true)
        {
            // Asynchronously receive data from the client
            int bytesRead = await stream.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None);

            if (bytesRead == 0)
            {
                // The client has disconnected
                break;
            }

            // Process the received data
            string data = Encoding.UTF8.GetString(buffer, 0, bytesRead);
            Console.WriteLine("Received from client: " + data);

            // Echo the data back to the client
            byte[] response = Encoding.UTF8.GetBytes("Echo: " + data);
            await stream.WriteAsync(response, 0, response.Length);
        }

        client.Close();
        Console.WriteLine("Client disconnected: " + client.Client.RemoteEndPoint);
    }

    public static void Main(string[] args)
    {
        var server = new ConcurrentServer();
        server.Start();
    }
}

在这个示例中，我们创建了一个简单的TCP服务器，它使用 BeginReceive 异步接收客户端发送的数据。每当有新的客户端连接时，服务器会创建一个新的任务来处理该客户端的连接。这样，服务器就可以同时处理多个并发连接。