How to create a task (TPL) running a STA thread?

Question

Using Thread is pretty straightforward

 Thread thread = new Thread(MethodWhichRequiresSTA);  thread.SetApartmentState(ApartmentState.STA);   

How to accomplish the same using Tasks in a WPF application? Here is some code:

Task.Factory.StartNew   (     () =>      {return "some Text";}   )    .ContinueWith(r => AddControlsToGrid(r.Result));   

I'm getting an InvalidOperationException with

The calling thread must be STA, because many UI components require this.

Answer 1

You can use the TaskScheduler.FromCurrentSynchronizationContext Method to get a TaskScheduler for the current synchronization context (which is the WPF dispatcher when you're running a WPF application).

Then use the ContinueWith overload that accepts a TaskScheduler:

var scheduler = TaskScheduler.FromCurrentSynchronizationContext();  Task.Factory.StartNew(...)             .ContinueWith(r => AddControlsToGrid(r.Result), scheduler);