Linking Cancellation Tokens

You want to use CancellationTokenSource.CreateLinkedTokenSource. It allows to have a “parent” and a “child” CancellationTokenSourcees. Here’s a simple example:

var parentCts = new CancellationTokenSource();
var childCts = CancellationTokenSource.CreateLinkedTokenSource(parentCts.Token);

childCts.CancelAfter(1000);
Console.WriteLine("Cancel child CTS");
Thread.Sleep(2000);
Console.WriteLine("Child CTS: {0}", childCts.IsCancellationRequested);
Console.WriteLine("Parent CTS: {0}", parentCts.IsCancellationRequested);
Console.WriteLine();

parentCts.Cancel();
Console.WriteLine("Cancel parent CTS");
Console.WriteLine("Child CTS: {0}", childCts.IsCancellationRequested);
Console.WriteLine("Parent CTS: {0}", parentCts.IsCancellationRequested);

Output as expected:

Cancel child CTS
Child CTS: True
Parent CTS: False

Cancel parent CTS
Child CTS: True
Parent CTS: True