Show loading progress when a window was loaded

[Grigory]

Hello,

I'm using RadWindow to show dialog with information. After the dialog opening my software loads data from database, while the process is in progress I would like to show a user all the dialogs, all controls and BusyIndicator. However, I didn't find a correct event to handle. The way I found which should works is to use Activated event, but it didn't helped me. Data loads firstly, and then dialog appears for a user.
The code I use:

View:

<telerik:RadWindow
...
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
...
>
    <telerik:EventToCommandBehavior.EventBindings>
         <telerik:EventBinding Command="{Binding OnActivatedCommand}" EventName="Activated" />
    </telerik:EventToCommandBehavior.EventBindings>

    <telerik:RadBusyIndicator
            BusyContent="Loading..."
            IsBusy="{Binding IsBusy}"
            IsIndeterminate="True">
    ...
    <telerik:RadWindow/>

 

ViewModel

public class ViewModel: ReactiveObject
{
    public ViewModel()
    {
        OnActivatedCommand = ReactiveCommand.Create(() =>
        {
            IsBusy = true;
            Thread.Sleep(5000); //Loading data simulation
            IsBusy = false;
        });
    }

    private bool _isBusy;

    public bool IsBusy
    {
        get { return _isBusy; }
        set { this.RaiseAndSetIfChanged(ref _isBusy, value); }
    }

    public ReactiveCommand OnActivatedCommand { get; private set; }
}

[Grigory]

Sorry, I mentioned in the example incorrect event. There is should be Loaded in the post. But the issue is still actual with this event.

[Martin]

Hello Grigory,

When you are using Thread.Sleep the UI Thread is blocked and the BusyIndicator can not be displayed. We recommend doing such operation in a separate thread using BackgroundWorker. You can take a look at this online demo.

Regards,
Martin Vatev
Progress Telerik