Handling multiple cancellation sources

Background tasks can leverage CancellationTokenSource to receive cancellation requests from as many sources as necessary. The static CancellationTokenSource.CreateLinkedTokenSource method accepts an array of CancellationToken objects to create a new CancellationTokenSource object that will notify us of cancellation if any of the source tokens receives a request to cancel.

Let’s look at a quick example of how to implement this in our CancellationPatterns project:

1. First, open the PollingExample class. We are going to create an overload of the CancelWithPolling method that accepts a CancellationTokenSource parameter. The two overloads of CancelWithPolling will look like this:

   public static void CancelWithPolling()
   {
       using CancellationTokenSource tokenSource = new();
       CancelWithPolling(tokenSource);
   }
   public static void CancelWithPolling
       (CancellationTokenSource...