Task.ContinueWith callback thread

Question

I tried to find an answer for this but couldn\'t. What I was wondering is that on which thread Task.ContinueWith delegate is called. For await I know that it tr

Answer 1

Task.ContinueWith is scheduled on the TaskScheduler.Current unless specified otherwise by the parameters in one of the optional overloads.

If you don't have a custom scheduler in TaskScheduler.Current (which is very likely) your continuation will run on the ThreadPool.

Task.ContinueWith never uses the SynchronizationContext unless you create a TaskScheduler out of it with TaskScheduler.FromCurrentSynchronizationContext.

You can always state explicitly which TaskScheduler is needed using one of the available overloads:

task.ContinueWith(
    _ => {}, 
    null, 
    CancellationToken.None, 
    TaskContinuationOptions.None, 
    TaskScheduler.Default); // Scheduled to the ThreadPool