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The code I've shown is (very) simplified. Inside GetWorkAsync() there are multiple further awaits. Some of them access the database and network, which means true I/O. As I understand, the thread switch is a natural consequence (albeit not required) of such awaits, because the initial thread doesn't establish any synchronization context that would govern where the continuations should execute. So they execute on a thread pool thread. Is my reasoning wrong?

aoven
– aoven

2017-02-19 15:29:44 +00:00
Commented Feb 19, 2017 at 15:29
@aoven Good point - I didn't consider the different kinds of SynchronizationContext - that is certainly important since .ContinueWith() uses the SynchronizationContext to dispatch the continuation; it would indeed explain the behaviour you're seeing if await is called on a ThreadPool thread or an ASP.NET thread. A continuation could certainly be dispatched to a different thread in those cases. On the other hand, calling await on a single-threaded context such as a WPF Dispatcher or Winforms context should be enough to ensure the continuation happens on the original. thread

Ben Cottrell
– Ben Cottrell

2017-02-20 10:43:07 +00:00
Commented Feb 20, 2017 at 10:43

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