Blocker bug!!! Binding ListBox to QueryableDataServiceCollectionView crush application

[Mark]

The binding Microsoft ListBox or Telerik ListBox crush application because it set CurrentPosition to wrong value when collection is empty. I hope this problem will be fixed pretty soon.

This binding raise exception in ItemsControlSelector (see bug1.png)

<telerik:RadListBox x:Name="ContentItemsControl" ItemTemplate="{StaticResource GoalSimpleViewTemplate}"
                    ItemsSource="{Binding Path=ItemsSource, ElementName=MainControl }"
                    SelectedItem="{Binding Path=SelectedItem, ElementName=MainControl }">
</telerik:RadListBox>

Binding to Microsoft ListBox expose source of the problem in QueryableCollectionView (see bug2.png) 

<ListBox x:Name="ContentItemsControl" ItemTemplate="{StaticResource GoalSimpleViewTemplate}"
                            ItemsSource="{Binding Path=ItemsSource, ElementName=MainControl }"
                            SelectedItem="{Binding Path=SelectedItem, ElementName=MainControl }">
        </ListBox>

Code for model taken from Telerik WPF example

    public class MainViewModel : BaswViewModel, INavigationAware
    {
        private QueryableDataServiceCollectionView<Goal> _goals;
        private Goal _selectedGoal;
        private bool _isGoalsBusy = true;

        public MainViewModel(IEventAggregator eventAggregator, IRegionManager regionManager, IConnectionService connectionController, IOptionsService optionsService)
            : base(eventAggregator, regionManager, connectionController, optionsService)
        {
        }

        public IEnumerable<Goal> Goals
        {
            get { return IsGoalsBusy ? null : _goals; }
        }

        public bool IsGoalsBusy
        {
            get { return _isGoalsBusy; }
            set
            {
                if (_isGoalsBusy != value)
                {
                    _isGoalsBusy = value;
                    RaisePropertyChanged("IsGoalsBusy");
                }
            }
        }

        public Goal SelectedGoal
        {
            get { return _selectedGoal; }
            set
            {
                if (_selectedGoal != value)
                {
                    _selectedGoal = value;
                    RaisePropertyChanged("SelectedGoal");
                }
            }
        }

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            SelectedGoal = null;
            SelectedActivity = null;
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
        }

        protected override void OnModelChanged()
        {
            base.OnModelChanged();

            if (Context != null)
            {
                UIDispatcher.BeginInvoke(() => { Initialize(); });
            }
        }

        private void Initialize()
        {
            _goals = new QueryableDataServiceCollectionView<Goal>(Context, Context.Goals);
            _goals.PropertyChanged += this.OnGoalsViewPropertyChanged;
            _goals.LoadedData += this.OnGoalsViewLoadedData;
            _goals.PageSize = 10;
            _goals.AutoLoad = true;

            RaisePropertyChanged("Goals");
        }

        private void OnGoalsViewPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "IsBusy")
            {
                this.IsGoalsBusy = _goals.IsBusy;
            }
        }

        private void OnGoalsViewLoadedData(object sender, LoadedDataEventArgs e)
        {
            if (e.HasError)
            {
                e.MarkErrorAsHandled();
            }
        }

    }
}

[Rossen Hristov]

Hello,

Can you send us a very small runnable dummy project that reproduces this exception. You can use Northwind or AdventureWorks sample DB's since we already have them. You can open a new support ticket and attach the sample project there. We will do our best to investigate what is going on.

Thanks in advance.

Regards,
Ross
the Telerik team

[Mark]

Done. I hope you will make patch ASAP.

P.S. It will be easy for you change your RadGridView to ListBox in your example to reproduce problem. :)

[Vlad]

Hello,

 We've not received any project demonstrating the issue so far.

Greetings,
Vlad
the Telerik team

[Mark]

Damn there is no way to attach zip file to the thread because of error "Incorrect file type. Please choose another file." and I cannot reach your email too. :-/ 

Please you following link to download example:
https://rapidshare.com/files/3066221343/TelerikBug.rar

[Rossen Hristov]

Hello,

As I mentioned in my previous post: "You can open a new support ticket and attach the sample project there."

Please, do that. Thank you.

Greetings,
Ross
the Telerik team

[Mark]

support ticket is 584550