Silverlight crashed while deleting item from RadGridView

[George]

Hi, while writing a simple master-details demo (http://dl.dropbox.com/u/12503247/Chinook.zip), I am in trouble.

First I press INSERT to insert a new row, type some letter as Album title.
And then I press DELETE to delete this row from RadGridView, IE crashed, And I got following exception info:

SCRIPT5022: Unhandled Error in Silverlight Application
Code: 4004    
Category: ManagedRuntimeError       
Message: System.InvalidOperationException: The specified entity is not a member of this collection.
   at System.ServiceModel.DomainServices.Client.EntitySet.Remove(Entity entity)
   at System.ServiceModel.DomainServices.Client.EntityCollection`1.ListCollectionViewProxy`1.Remove(Object value)
   at System.ServiceModel.DomainServices.Client.EntityCollection`1.ListCollectionViewProxy`1.RemoveAt(Int32 index)
   at System.Windows.Data.ListCollectionView.RemoveAt(Int32 index)
   at System.Windows.Data.ListCollectionView.Remove(Object item)
   at Telerik.Windows.Data.DataItemCollection.Remove(Object item)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.DeleteItems(IEnumerable`1 itemsToDelete)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.DeleteSelectedItems()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.TryDeleteSelectedItems()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnDeleteCommand(Object sender, ExecutedRoutedEventArgs e)
   at Telerik.Windows.Controls.CommandBinding.OnExecuted(Object sender, ExecutedRoutedEventArgs e)
   at Telerik.Windows.Controls.CommandManager.ExecuteCommandBinding(Object sender, ExecutedRoutedEventArgs e, CommandBinding commandBinding)
   at Telerik.Windows.Controls.CommandManager.FindCommandBinding(CommandBindingCollection commandBindings, Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
   at Telerik.Windows.Controls.CommandManager.FindCommandBinding(Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
   at Telerik.Windows.Controls.CommandManager.OnExecuted(Object sender, ExecutedRoutedEventArgs e)
   at Telerik.Windows.Controls.ExecutedRoutedEventArgs.InvokeEventHandler(Delegate genericHandler, Object target)
   at Telerik.Windows.RadRoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at Telerik.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RadRoutedEventArgs routedEventArgs)
   at Telerik.Windows.RouteItem.InvokeHandler(RadRoutedEventArgs routedEventArgs)
   at Telerik.Windows.EventRoute.InvokeHandlersImpl(Object source, RadRoutedEventArgs args, Boolean raisedAgain)
   at Telerik.Windows.EventRoute.InvokeHandlers(Object source, RadRoutedEventArgs args)
   at Telerik.Windows.RadRoutedEventHelper.RaiseEvent(DependencyObject element, RadRoutedEventArgs args)
   at Telerik.Windows.DependencyObjectExtensions.RaiseEvent(DependencyObject element, RadRoutedEventArgs e)
   at Telerik.Windows.Controls.RoutedCommand.ExecuteImpl(Object parameter, UIElement target)
   at Telerik.Windows.Controls.RoutedCommand.Execute(Object parameter, UIElement target)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.ExecutePendingCommand()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.PendAndExecuteCommands(KeyEventArgs e)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnKeyDown(KeyEventArgs e)
   at System.Windows.Controls.Control.OnKeyDown(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)     
 
ChinookTestPage.aspx, Line:56 Char:13

If I removed CompositionAttribute from property Albums in class ArtistMetadata, everything works fine. 

Is there anybody have same problem? How can I avoid it if I really do not want client to insert/delete albums entity without a artist?

The demo use latest Chinook Database for MSSQL and Silverlight 4. Telerik Controls version is RadControls for Silverlight Q2 2011 SP1.  

Thanks, best regards.

George.P

[George]

It's seems a bug in class EntityCollection, here is my debug details: http://forums.silverlight.net/t/240836.aspx/1?Possible+bug+in+EntityCollection+T+ .

The WCF RIA Services V1.0 SP2 RC still have this problem. Is there a way to bind an EntityCollection with an ObservableCollection, so that we can avoid this bug?

[Nedyalko Nikolov]

Hi George,

There is no way to "bind" collections you will need a proxy collection. However Telerik has the right solution for you. I would recommend using of RadDomainDataSource control which in fact does similar "binding" between EntityCollection and ObservableCollection. We've just test your scenario with RadDomainDataSource and RadGridView and everything works fine. For more information about RadDomainDataSource control you can take a look at this blog post (and referenced blog posts).

Best wishes,
Nedyalko Nikolov
the Telerik team

[George]

We have a lot of pages which have RadGridView control binding to EntityCollection, it cost too much to change current business logic with DomainDataSource control.

To someone who have same problem, our not good but worked solution is handle GridView deleting event, manually delete detail entity from master entity.

Thank you for reply.