Load Async data in a UserControl with SetPropertyAndNotifyOnCompletion instead of NotifyTaskCompletion

[alexdess]

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

Currently I am still using the following result wrapper:

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

Corresponding Xaml

<Grid Visibility="{Binding AllArticleCategoriesTask.IsCompleted, Converter={StaticResource BooleanToVisibilityFbConverter}}" 
           Background="Pink">
            <dxe:ComboBoxEdit ItemsSource="{Binding AllArticleCategoriesResult}">
            <dxe:ComboBoxEdit.StyleSettings>
                <dxe:TokenComboBoxStyleSettings />
            </dxe:ComboBoxEdit.StyleSettings>
        </dxe:ComboBoxEdit>
</Grid>

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