Load Async data in a UserControl with SetPropertyAndNotifyOnCompletion instead of NotifyTaskCompletion

Hello,

I'm currently modifying a UserControl to remove NotifyTaskCompletion class and use directly the Task with SetPropertyAndNotifyOnCompletion .

I am working on a .NET 4.8 project in WPF and I have the following problem:
Constructor
```
public ArticleCategoryUserControlModel()
{
_serviceProvider = ApplicationBootstrapper.ServiceProvider;

AllArticleCategoriesTask = RequestValuesAsync();
}
```
```
private async Task> RequestValuesAsync()
{
using var scope = _serviceProvider.CreateScope();
var articleCategoryReader = scope.ServiceProvider.GetRequiredService();
await Task.Delay(3000); // for debug purpose
var res = await articleCategoryReader.GetAllAsync();
return new ObservableCollection(res);
}
```

Currently I am still using the following result wrapper:

```
public ObservableCollection AllArticleCategoriesResult =>
AllArticleCategoriesTask.Status == TaskStatus.RanToCompletion
? AllArticleCategoriesTask.Result
: null;
```

Corresponding Xaml

```

```

My question is the following: Is it possible to do the same behavior without the AllArticleCategoriesResult property?

In the Xaml, I can't directly use AllArticleCategories.Result because it causes me to freeze the UI. I have to use the AllArticleCategoriesResult property.

Thanks