How can I change a UdpClient port after I established it a first time (Only one usage of each socket address is normally permitted)

Question

So i'm trying to make something that allows the user to change connections..(disregarded the IP code because that part isn't erroring.. just the port)

    private readonly UdpClient _udpListener;
    private IPEndPoint _listeningEndPoint;

    public FeedbackListener( int feedbackPort )
    {
        _listeningEndPoint = new IPEndPoint( IPAddress.Any, _feedbackPort );            
        _udpListener = new UdpClient( _listeningEndPoint );
    }

so say the user connects once:

public FeedbackListener _feedback;

_feedback = new FeedbackListener(Convert.ToInt32(port));

and they try to disconnect and reconnect with a DIFFERENT port:

//_udpListener.Close();  tried this, just turns into another about accessing a disposed object
_feedback = new FeedbackListener(Convert.ToInt32(port));

i get this error: Only one usage of each socket address is normally permitted... so is there any way i can successfully change the port without getting this error?

Answer 1

You need to keep only one instance of IPEndPoint and only update the Port when you want to instantiate a new UdpClient

Something like:

private static IPEndPoint _listeningEndPoint = null;

public FeedbackListener( int feedbackPort )
{
    if ( _listeningEndPoint == null)
    {
       _listeningEndPoint =  new IPEndPoint( IPAddress.Any, feedbackport);
    }
    else
    {
        _listeningEndPoint.Port = feedbackport;
    } 
}