Rx and tasks - cancel running task when new task is spawned?

Question

I have an user interaction scenario I\'d like to handle with Rx.

The scenario is similar to the canonical \"when user stops typing, do some work\" (usually, search

Answer 1

You can just use Observable.FromAsync which will generate tokens that are cancelled when the observer unsubcribes:

input.Throttle(...)
     .Select(_ => Observable.FromAsync(token => CreateMyTask(..., token)))
     .Switch()
     .Subscribe(...);

This will generate a new token for each unit of work and cancel it every time Switch switches to the new one.