Task.WhenAny with cancellation of the non completed tasks and timeout

Question

In my app I am creating some concurrent web requests and I am satisfied when any one of them completes, so I am using the method Task.WhenAny:

var urls = new         


        

Answer 1

Simply pass to all of your tasks the same cancellation token, something like this:

CancellationTokenSource cts = new CancellationTokenSource();
CancellationToken ct = cts.Token;
// here you specify how long you want to wait for task to finish before cancelling
int timeout = 5000;
cts.CancelAfter(timeout);
// pass ct to all your tasks and start them
await Task.WhenAny(/* your tasks here */);
// cancel all tasks
cts.Cancel();

Also, you need to read this thread to be aware of how to use CancellationToken correctly: When I use CancelAfter(), the Task is still running