Does Task.ContinueWith capture the calling thread context for continuation?

Question

The Test_Click below is a simplified version of code which runs on a UI thread (with WindowsFormsSynchronizationContext):

void Test_Click(object         


        

Answer 1

It doesn't use the current synchronization context by default, but TaskScheduler.Current, as seen in the following decompiled code:

public Task ContinueWith(Action> continuationAction)
{
  StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
  return this.ContinueWith(continuationAction, TaskScheduler.Current, new CancellationToken(), TaskContinuationOptions.None, ref stackMark);
}

TaskScheduler.Current is either TaskScheduler.Default or the TaskScheduler of the current task if the task is a child task. Always specify the task scheduler if you don't want to run into weird problems, or better, use await if you can.