Q3 Nested Hierarchy Exception

[James]

Hello,

I'm attempting to migrate my code to Q3 (2009.3.1120.1030) and have struck an exception when loading a nested hierarchy.

In Q2 I used event PreviewDataRecordCreate to build up the relationships but I see this has been marked obsolete, so I'm now using the suggested RowLoaded event.

First, here is a code snippet used within the RowLoaded event:
 

                    GridViewTableDefinition detailDefinition = new GridViewTableDefinition();
                    detailDefinition.Relation = new PropertyRelation("OrderDetail");
                    e.GridViewDataControl.ChildTableDefinitions.Add(detailDefinition);

The last line throws this excpetion:

{System.Exception: Error HRESULT E_FAIL has been returned from a call to a COM component.
   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.Collection_Clear[T](PresentationFrameworkCollection`1 collection)
   at System.Windows.PresentationFrameworkCollection`1.ClearImpl()
   at System.Windows.PresentationFrameworkCollection`1.Clear()
   at Telerik.Windows.Controls.GridView.GridViewBaseVirtualizingPanel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)
   at Telerik.Windows.Controls.GridView.GridViewBaseVirtualizingPanel.OnItemsChangedHandler(Object sender, ItemsChangedEventArgs args)
   at Telerik.Windows.Controls.GridView.GridViewItemContainerGenerator.OnRefresh()
   at Telerik.Windows.Controls.GridView.GridViewItemContainerGenerator.Refresh()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.childTables_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.RadObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Data.TableDefinitionCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
   at Telerik.Windows.Data.RadObservableCollection`1.InsertItem(Int32 index, T item)
   at System.Collections.ObjectModel.Collection`1.Add(T item)
   at SLTraderShellPrototype.OpenPositionsGrid.radGridViewPropertyHierarchy_RowLoaded(Object sender, RowLoadedEventArgs e)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnRowLoaded(RowLoadedEventArgs e)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.RaiseRowLoaded(GridViewRowItem row)
   at Telerik.Windows.Controls.GridView.GridViewRowItem.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)}

Help appreciated.

Regards,
James

[Vlad]

Hi James,

With Q3 you do not need to do that - just set IsExpandable to desired value for desired row. I've attached an example project for reference.

Sincerely yours,
Vlad
the Telerik team

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