private void OnDetailsViewDataContextChanged(FrameworkElement sender, DataContextChangedEventArgs args)
{
if (args.NewValue == _prev)
{
return;
}
if (_prev != null)
{
_prev.Cleanup();
_prev = null;
}
if (args.NewValue is PlaylistDetailViewModel p)
{
_prev = p;
}
}
/// <summary>
/// Handle navigate from events and cleanup all used variables.
/// </summary>
/// <param name="e">NavigateFrom event arguments, used by common navigation helper.</param>
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
_navigationHelper.OnNavigatedFrom(e);
base.OnNavigatedFrom(e);
_vm.Cleanup();
}
