[Bug] document.LoadFamily() breaks UI update

[nice3point]

When using the document.LoadFamily() method, there is a problem that freezes the UI update of both my plugin and the entire Revit ribbon. The problem occurs when my plugin has a Storyboard animation and when the family is updated during LoadFamily (for example, from version 2019 to 2023).

Tested Revit versions: 2021-2023

Before loading:

Updating:

After loading:

The revit ribbon is not responding, neither is my plugin. Temporary treatment by right-clicking anywhere or left-clicking on the properties panel.

Solution and family in attached files.

[a.slutskij]

I had the same problem in Revit 2022, but for now only on default Sample Architecture Project

[ricaun]

I was not able to compile your solution in Visual Studio 2022, something with 'Duplicate AttributeUsage' related to the 'Microsoft.Toolkit.Mvvm.SourceGenerators.NullabilityAttributesGenerator'.

I create an example from scratch and looks like works fine.

After that, I add the 'ProgressRing' code on the WPF and something happens after loading the family, the UI break and stops updating or something.

Here is a quick video.

https://youtu.be/ZnaGXmanCrI

[nice3point]

@ricaunthanks for the video) https://github.com/dotnet/wpf/issues/6792#issuecomment-1183530305  this is a bug in the latest version of .Net 6, Microsoft hasn't fixed it yet, a workaround is to downgrade the Sdk version in global.json https://github.com/Nice3point/RevitTemplates/discussions/25 

[ilya.sector.1]

I had the same problem, UI breaks when there is animation during family update

[ricaun]

Looks like is something related to the Storyboard and Animation in the WPF.

[Kennan.Chen]

Loading a rfa file into a document using LoadFamily() freezes Revit UI - Autodesk Community - Revit ...

I ran into this problem years ago and you can refer to the above thread to get a workaround

[nice3point]

The first time Balloon worked, all the others had no effect. It's a shame that for so many years the problem has not been raised or solved by Autodesk

[Kennan.Chen]

It functions well to host the UI in a standalone WPF app that communicates with Revit process via IPC.
I use this workaround in production for years.