Execute Console App from Revit

[yafimski]

Hi, I think this repo can be useful to execute a Console App from Revit, because the console app has async code, so I want to await the result of the console app before I trigger any ExternalEvent from Revit.

I'm new to this, so perhaps there is a simple way to explain how to: Start Revit Command -> Start Console App -> Await Result -> use Result in ExternalEvent -> do Transaction()

any tips on how to achieve this?

[KennanChan]

Well, it is a matter of wrapping an external process with task-based asynchronous pattern. The wrapper wraps around Process object just like Revit.Async wraps around Revit ExternalEvent

https://github.com/Cysharp/ProcessX This is a package I found on github who does similar wrapping

[KennanChan]

And your last part is right. When an external console app finishes running, you may get the result in a background thread. And you can then use Revit,Async to commit transaction on site easily

[yafimski]

And your last part is right. When an external console app finishes running, you may get the result in a background thread. And you can then use Revit,Async to commit transaction on site easily

Can this be done with the regular Revit.Async example, or do I need to use the example below Define your own handler in the readme? I just don't see where the 'process' comes in, for the vanilla example..

[KennanChan]

It's not part of Revit.Async, nor it is part of Revit.

You need to find solutions in the .NET world.

Actually the Microsoft .NET docs about System.Diagnostics.Process.Exited event demonstrates a simple async/await wrapper around Process object.

[KennanChan]

The key is to use TaskCompletionSource<T> class. It generates a Task<T> object for other logic to wait. And use TrySetResult<T>(T result) to signal that the Task<T> completes and other logic is can run.

[KennanChan]

Weakly related to Revit.Async, I think I can close this issue