c# - How to set test TCP connection timeout?

Question

I try to test TCP connection with the following code.

System.Threading.Thread t = new System.Threading.Thread(() =>
{      
    using (TcpClient client = new TcpClient())
    {
        client.Connect(ip, Convert.ToInt32(port));
    }
});
t.Start();

How to set time out if the IP or port is invalid?

Answer 1

There is no built in way to do this. I use the following code for many of our application. The code is by no means original but works out okay. Please note that you may have to add retries to this function... sometimes it returns false even when the server is up and running.

  private static bool _TryPing(string strIpAddress, int intPort, int nTimeoutMsec)
    {
        Socket socket = null;
        try
        {
            socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.DontLinger, false);


            IAsyncResult result = socket.BeginConnect(strIpAddress, intPort, null, null);
            bool success = result.AsyncWaitHandle.WaitOne(nTimeoutMsec, true);

            return socket.Connected;
        }
        catch
        {
            return false;
        }
        finally
        {
            if (null != socket)
                socket.Close();
        }
    }