时间：2019-05-10 标签：c#socketconnectionwithmultithreadingtelnet

Posted 2023-03-16

【中文标题】时间：2019-05-10 标签：c#socketconnectionwithmultithreadingtelnet

【英文标题】：c# socket connection with multi threading telnet

【发布时间】：2020-10-01 08:42:22

【问题描述】：

**我用c#这个代码socket连接多线程**

我需要为我的套接字连接 telnet 设置超时

    string ip = "";
    int port = 23;
    string str = "";
    IPAddress address = IPAddress.Parse(ip);
    IPEndPoint ipEndPoint = new IPEndPoint(address, port);
    Socket socket = new Socket(address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
    socket.Connect((EndPoint)ipEndPoint);
    try
    

        byte[] numArray = new byte[1024];

        while (socket.Connected)  

        int count = socket.Receive(numArray);
        str += Encoding.ASCII.GetString(numArray, 0, count);
            Console.WriteLine(str);
        

        socket.Close();
    
    catch (ArgumentNullException ex)
    
    

【参考方案1】：

您可以创建一个计时器来执行此操作，或者我喜欢给 socket.connected 一个时间范围并以此为基础。你显然需要根据你的条件修改时间，但这个例子过去对我有用。

Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

// Connect using a timeout (5 seconds)

IAsyncResult result = socket.BeginConnect( iP, iPort, null, null );

bool success = result.AsyncWaitHandle.WaitOne( 5000, true );

if ( socket.Connected )

    socket.EndConnect( result );

else 

     //Be sure to close socket
     socket.Close();
     throw new ApplicationException("Failed to connect the server. Try again.");

我看到另一个人用计时器做的例子，但我没有亲自使用过，所以你更喜欢哪个。启动一个定时器（timer_connection），如果时间到了，检查socket连接是否连接（if(m_clientSocket.Connected)），如果没有，则弹出超时错误

private void connect(string ipAdd,string port)
    
        try
        
            SocketAsyncEventArgs e=new SocketAsyncEventArgs();


            m_clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            IPAddress ip = IPAddress.Parse(serverIp);
            int iPortNo = System.Convert.ToInt16(serverPort);
            IPEndPoint ipEnd = new IPEndPoint(ip, iPortNo);

            //m_clientSocket.
            e.RemoteEndPoint = ipEnd;
            e.UserToken = m_clientSocket;
            e.Completed+=new EventHandler<SocketAsyncEventArgs>(e_Completed);                
            m_clientSocket.ConnectAsync(e);

            if (timer_connection != null)
            
                timer_connection.Dispose();
            
            else
            
                timer_connection = new Timer();
            
            timer_connection.Interval = 2000;
            timer_connection.Tick+=new EventHandler(timer_connection_Tick);
            timer_connection.Start();
        
        catch (SocketException se)
        
            lb_connectStatus.Text = "Connection Failed";
            MessageBox.Show(se.Message);
        
    
private void e_Completed(object sender,SocketAsyncEventArgs e)
    
        lb_connectStatus.Text = "Connection Established";
        WaitForServerData();
    
    private void timer_connection_Tick(object sender, EventArgs e)
    
        if (!m_clientSocket.Connected)
        
            MessageBox.Show("Connection Timeout");
            //m_clientSocket = null;

            timer_connection.Stop();
        
    

【讨论】：

我会试一试，但是这个 timer_connection opejct 是什么...我认为它就像计时器，但计时器没有事件 Tick

我发布了两种不同的方法来做同样的事情。你可以做上面的方法，或者下面的方法。至于计时器，滴答是每个间隔周期发生的事情，在上面的示例中，它每 2 秒检查一次连接是否已连接。

这里有很多例子：***.com/questions/1062035/…