Ignore `ActionEventHandler` when null - UI.Demo

[ricaun]

Summary of the Pull Request

When using UI.Demo the Application.ActionEventHandler is null.

The EventMonitor.Subscribe and EventMonitor.Unsubscribe throw exception.

Quality Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings

[ricaun]

A better solution would be to create a Mock viewmodel to create logic for the demo project that does not reference the Revit Api

Yes. I'm not sure if this is right, the IEventsViewModel is something like this.

public interface IEventsViewModel : ISnoopViewModel
{
    void OnNavigatedTo();
    void OnNavigatedFrom();
}

[ricaun]

A better solution would be to create a Mock viewmodel to create logic for the demo project that does not reference the Revit Api

Yes. I'm not sure if this is right, the IEventsViewModel is something like this.

public interface IEventsViewModel : ISnoopViewModel
{
    void OnNavigatedTo();
    void OnNavigatedFrom();
}

Or this. 😀

public interface IEventsViewModel : INavigationAware, ISnoopViewModel 
{
}

[Nice3point]

Or this. 😀

public interface IEventsViewModel : INavigationAware, ISnoopViewModel 
{
}

or this 😉

public interface IEventsViewModel : INavigationAware, ISnoopViewModel;

in C# 12 you can use ; instead of {} yeah, that's a great plan, let's do that)

[ricaun]

IEventsViewModel 

Done! I added a Subscribe/Unsubscribe in the moq. Strange that all de RevitApi.dll is loaded when you go into the Events.

[Nice3point]

Awesome, thanks)

[Nice3point]

Strange that all de RevitApi.dll is loaded when you go into the Events.

There because of using using Autodesk.Revit.Exceptions; in SnoopViewModelBase, I fixed it by inheriting ObservableObject instead of SnoopViewModelBase