TcpListener: how to stop listening while awaiting AcceptTcpClientAsync()?

Question

I don\'t know how to properly close a TcpListener while an async method await for incoming connections. I found this code on SO, here the code :

public class         


        

Answer 1

Define this extension method:

public static class Extensions
{
    public static async Task<TcpClient> AcceptTcpClientAsync(this TcpListener listener, CancellationToken token)
    {
        try
        {
            return await listener.AcceptTcpClientAsync();
        }
        catch (Exception ex) when (token.IsCancellationRequested) 
        { 
            throw new OperationCanceledException("Cancellation was requested while awaiting TCP client connection.", ex);
        }
    }
}

Before using the extension method to accept client connections, do this:

token.Register(() => listener.Stop());