How to show a waitcursor when the WPF application is busy databinding

Question

I have a WPF application using the MVVM pattern that sometimes have to show a waitcursor when it is busy doing something the user has to wait for. Thanks to a combination of

Answer 1

Isak's answer did not work for me, because it did not solve the problem of how to act when the actual wait is over for the user. I ended up doing this: Everytime I start doing something timeconsuming, I call a helper-method. This helper method changes the cursor and then creates a DispatcherTimer that will be called when the application is idle. When it is called it sets the mousecursor back:

/// 

///   Contains helper methods for UI, so far just one for showing a waitcursor
/// 
public static class UiServices
{

     /// 

     ///   A value indicating whether the UI is currently busy
     /// 
     private static bool IsBusy;

     /// 

     /// Sets the busystate as busy.
     /// 
     public static void SetBusyState()
     {
          SetBusyState(true);
     }

     /// 

     /// Sets the busystate to busy or not busy.
     /// 
     /// if set to true the application is now busy.
     private static void SetBusyState(bool busy)
     {
          if (busy != IsBusy)
          {
               IsBusy = busy;
               Mouse.OverrideCursor = busy ? Cursors.Wait : null;

               if (IsBusy)
               {
                   new DispatcherTimer(TimeSpan.FromSeconds(0), DispatcherPriority.ApplicationIdle, dispatcherTimer_Tick, Application.Current.Dispatcher);
               }
          }
     }

     /// 

     /// Handles the Tick event of the dispatcherTimer control.
     /// 
     /// The source of the event.
     /// The  instance containing the event data.
     private static void dispatcherTimer_Tick(object sender, EventArgs e)
     {
          var dispatcherTimer = sender as DispatcherTimer;
          if (dispatcherTimer != null)
          {
              SetBusyState(false);
              dispatcherTimer.Stop();
          }
     }
}