C＃插座处理多个客户端 [英] c# sockets handling multiple clients

问题描述

我有下面的代码，我要实现我的服务器。以我的理解是异步。并应允许多个客户端的连接...

I have the following code which I want to implement as my server. As I understand it is async. and should allow connections from multiple clients...

public void Start()
{          
    TcpListener listener = new TcpListener(IPAddress.Any, 10250);
    listener.Start();
    Console.WriteLine("Listening...");

    while (true)
    {
        IAsyncResult res = listener.BeginAcceptTcpClient(HandleAsyncConnection, listener);
        connectionWaitHandle.WaitOne();
    }
}

private void HandleAsyncConnection(IAsyncResult res)
{
    TcpListener listener = (TcpListener)res.AsyncState;
    TcpClient client = listener.EndAcceptTcpClient(res);
    connectionWaitHandle.Set();

    StringBuilder sb = new StringBuilder();
    var data = new byte[client.ReceiveBufferSize];

    using (NetworkStream ns = client.GetStream())
    {             
        // Test reply
        Byte[] replyData = System.Text.Encoding.ASCII.GetBytes(DateTime.Now.ToString());
        ns.Write(replyData, 0, replyData.Length);
        ns.Flush();
        ns.Close();
    }

    client.Close();
}

我有一个测试应用程序，它只是触发请求到我的服务器。正如你可以在代码中看到服务器只是它的日期/时间回复。测试应用程序发送20说这些请求是简单的测试字符串。对于每一个它打开一个套接字这些请求​​，将数据发送到我的服务器，然后再次关闭套接字。

I have a test app which simply fires requests to my server. As you can see in the code the server just replies with its date/time. The test app sends say 20 requests which are simply test strings. For each of these requests it opens a socket, sends the data to my server and then closes the socket again.

这正常工作与一个测试应用程序的运行。不过，如果我开两个测试Apps中的第二个无法连接到服务器。我想因为我处理请求的异步。因为我的测试应用程序打开，然后在每次调用前关闭套接字我可以从多个客户端的处理请求？

This works fine with one test app running. However, if I open two test apps the second one cannot connect to the server. I thought because I am handling the request async. and because my test app opens then closes the socket before each call I could handle requests from multiple clients?

推荐答案

如果使用> =。NET4.5，最好使用新的网络中的方法然后允许通过的异步和的await 。因此，它可能会更好跟随我在这个帖子作为一个起点。

Edit

If using >=.Net4.5, it's better to use the new network methods that then permit the adoption of async and await. As such, it might be better to follow the example I provided in this post as a starting point.

下面的代码。说明如何异步接受多个客户端，而分拆每个连接一个新线程

The following code demonstrates how to accept multiple clients asynchronously without spinning off a new thread per connection.

private TcpListener listener;
public void Start()
{          
    listener = new TcpListener(IPAddress.Any, 10250);
    listener.Start();
    Console.WriteLine("Listening...");
    StartAccept();

}
private void StartAccept()
{
    listener.BeginAcceptTcpClient(HandleAsyncConnection, listener);
}
private void HandleAsyncConnection(IAsyncResult res)
{
    StartAccept(); //listen for new connections again
    TcpClient client = listener.EndAcceptTcpClient(res);
    //proceed

}

您可以使用此模式对于大多数异步操作。

You can use this pattern for most async operations.

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