Can you chain Idling events?

[ariWZRFQ]

Is it possible to chain Idling events?

Say I have two functions, FuncA and FuncB. I want to run FuncA the first time revit idles, then run FuncB after FuncA is done running and revit idles again. Inside my FuncA handler, I am removing the handler to FuncA from UIApp.Idling, but I can not assign a new handler because I don't have a valid API context.

Is there a way for me to achieve my intended behavior?

NOTE: The reason I'm doing any of this at all is because of this referenced post. For some reason, Revit throws an internal exception if my FuncA and FuncB are called one after the other. So I am separating them with an idling event. Now I need to add another idling event before FuncA.

[ariWZRFQ]

Thanks for the reply and sorry for my own delay.

I already have the Revit.Async Initialized in the .OnStartup Method of the IExternalApplication with RevitTask.Initialize(application); where application is the UIControlledApplication that is passed into the OnStartup() method.

I still don't understand why my code from my previous reply isn't working. It seems like it should be based on my understanding from this thread and the Revit.Async Docs.

The only thing I could think is that since the return Autodesk.Revit.UI.Result.Succeeded; is being called likely before any of the tasks have returned in my func1, func2, and func3, I have lost the valid Revit context before the worker threads can do the revit tasks? Really just guessing now

Thanks Kennan!

[Kennan.Chen]

That sounds weird. Can you share some detail about your func1 and func2? 

[ariWZRFQ]

Thanks Kennan,

I just sent you an email so that I don't drag this thread much longer. Appreciate the help, let me know if you didn't receive it.

Appreciate everyones help and I will update this thread with the resolution.