NetworkInterface.OperationalStatus

Best Answer icabodcam, 28 April 2015 - 05:54 PM

I believe that I've got a solution. 

Reminded in this thread by Nobby, the Socket.Poll method was the solution. 

So the solution looks something like this in the constructor for the listener class:

try
            {
                Debug.Print(NetworkInterface.GetAllNetworkInterfaces()[0].IPAddress);
                listeningSocket.Bind(new IPEndPoint(IPAddress.Any, portNumber));
                listeningSocket.Listen(10);
                bool testConnection = listeningSocket.Poll(500,SelectMode.SelectRead);
            }
            catch (SocketException)
            {
                isNetworkAvailable = false;
                listeningSocket.Close();
            }

Then in the method or thread that handles the listener, test the status of isNetworkAvailable before using the socket, kind of like:

if (isNetworkAvailable)
                {
                    try
                    {
                        using (Socket clientSocket = listeningSocket.Accept())
                        {
                            ...
                        }

...and in the
NetworkAvailabilityChanged handler if network not available then close the socket, else recreate the socket, bind, and start listening.

I hope that helps someone else. 

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