Export to CSV - fails with multiple derived types.

[Tim]

If I have a RadGridView bound to

ObservableCollection<X> ItemsSource = new ObservableCollection<X>

where X is an abstract class, and I put only derived Y objects inside, then the grid export to CSV works.  As soon as I put a sibling derived Z object in, the export fails:

Error: An unknown error has occurred.
Detail: System.NullReferenceException
Object reference not set to an instance of an object.
   at Telerik.Windows.Data.Expressions.ExpressionFactory.MakeMemberAccess(Expression instance, String memberName, Type memberType)
   at Telerik.Windows.Data.Expressions.PropertyAccessExpressionBuilder.CreateMemberAccessExpressionOverride()
   at Telerik.Windows.Data.Expressions.MemberAccessExpressionBuilderBase.CreateMemberAccessExpression()
   at Telerik.Windows.Data.Expressions.MemberAccessExpressionBuilderBase.CreateLambdaExpression()
   at Telerik.Windows.Data.BindingToExpressionExtensions.CreateMemberAccessLambdaExpression(Binding binding, Type objectType, Type memberType)
   at Telerik.Windows.Data.BindingToExpressionExtensions.CreateUntypedMemberAccessFunc(Binding binding, Type objectType, Type memberType)
   at Telerik.Windows.Data.BindingToExpressionExtensions.CreateMemberAccessFunc(Binding binding, String stringFormat, Type objectType, Type memberType)
   at Telerik.Windows.Controls.GridViewBoundColumnBase.InitializeMemberAccessFunc()
   at Telerik.Windows.Controls.GridViewBoundColumnBase.GetCellContent(Object item)
   at Telerik.Windows.Controls.GridViewExportWriter.RenderDataCells(Object item)
   at Telerik.Windows.Controls.GridViewExportWriter.RenderDataRows(IEnumerable items)
   at Telerik.Windows.Controls.GridViewExportWriter.Render()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.Export(Stream stream, GridViewExportOptions options)
   at Client.GridUtilities.ExportCsv(RadGridView gridView)
   at Client.HomePage.ExportToCsv(Object sender, RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)


Is this a bug? Where should I start looking?

Thanks,
Tim

[Yavor Georgiev]

Hello Tim,

 I believe we encountered a very similar issue some time ago in RadTreeListView, again with multiple types derived from a shared base type. We fixed that bug in a recent version, however. What version of our controls are you using? Could you please try using our 2010 Q3 SP1 assemblies, or even the latest internal build?

All the best,
Yavor Georgiev
the Telerik team

[Tim]

I am using 2010.3.1110.  It appears fixed in 2010.3.1314.

Thanks,
Tim