Cancel WhenAny - linked CancellationTokenSource

[giscus[bot]]

Cancel WhenAny - linked CancellationTokenSource

In today's short post, I will show you how to cancel a Task with multiple inputs (aka multiple CancellationTokens) using CancellationTokenSource and CancellationTokenSource.CreateLinkedTokenSource.

https://steven-giesel.com/blogPost/cd950c5f-467b-48a3-99fe-e72865460579

[jslicer]

So I'm looking through one of my company's codebases, and I see a number of these which only seem to link one token, like this:

CancellationTokenSource cts = CancellationTokenSource.CreateLinkedTokenSource(this._ct);

This seems to allow a more "local" method (couldn't find a better term, not talking about local methods) to call cts.Cancel() and/or the single linked token to be cancelled from elsewhere. Is my understanding correct?

[linkdotnet]

Without more context, I can only speculate. But this approach lets you listen to two Tokens: this._ct and cts.Token. If one of them is getting canceled, your task gets canceled. This also allows active cancellation of cts without interfering with this._ct, which might cancel other tasks.