Can i cancel StreamReader.ReadLineAsync with a CancellationToken?

Question

When I cancel my async method with the following content by calling the Cancel() method of my CancellationTokenSource, it will stop eventually. How

Answer 1

I like to use an infinite delay, the code is quite clean. If waiting is complete WhenAny returns and the cancellationToken will throw. Else, the result of task will be returned.

public static async Task WithCancellation(this Task task, CancellationToken cancellationToken)
{
        using (var delayCTS = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken))
        {
            var waiting = Task.Delay(-1, delayCTS.Token);
            var doing = task;
            await Task.WhenAny(waiting, doing);
            delayCTS.Cancel();
            cancellationToken.ThrowIfCancellationRequested();
            return await doing;
        }
}