Tip 3: Wrap events up in Task-returning APIs and await them
- Posted: Mar 12, 2013 at 6:00 AM
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Async Tip #3: You can wrap events up in Task-returning APIs and await them. This can dramatically simplify code.
Slides and source code are available on Lucian's blog.
This video introduces a new pattern for dealing with events: you can await them! Now why would you want to do that? Well, in some cases like responding to a button-click, it's fine to handle events in the way that you always have with top-level event handlers. But if you're building a complicated UI that has to orchestrate a whole load of events (StoryboardCompleted, MediaElementCompleted, PointerMoved, PointerReleased, ...) then it makes for cleaner code to await them. The key is the type TaskCompletionSource introduced in .NET4.