[Solved] RadDataPager + RadGridView crashes when trying to group

[Dan]

I have a RadGridView control with it's ItemSource set to this ItemsSource="{Binding PagedSource, ElementName=radDataPager}"  then I set the Source of the dataPages to my Collection. This works great I can go to pages etc no problem. Until I try to group by columns. If I'm on the first page everythig works fine. If I switch to a page 2 and beyond I get a crash.

Here is the stack trace:

____ An unhandled exception (‘Unhandled Error in Silverlight Application

Code: 4004

Category: ManagedRuntimeError

Message: SystemJnvalidCastException: Unable to cast object of type

‘myUI.l.Changel isV to type Telerik.Windows.DataJGroup’.

at System.Linq.Enumerable.<Castlterator>d_bl’1.MoveNexto

at Telerik.Windows.Data.GroupExtensions.LeaflndexOf(IEnumerable’1

groups, Object item)

at

Telerik.Windows.Data.QueryableCollectionView.G roupedlndexOf(Object

item)

at Telerik.Windows.Data.QueryableCollectionViewlnternallndexOf(Object

item)

at Telerik.Wi ndows.Data.QueryableCollectionViewJndexOf(Object item)

at Telerik.Wi ndows.Data.QueryableCollectionView.MoveCu rrentTo(Object

item)

at Telerik.Wi ndows.Data.DataltemCol lection.MoveCu rrentTo(Object item)

at

Telerik.Windows.Data.DataltemCollection.UpdateCurrentltemFromSource...

at

Telerik.Windows.Data.DataltemCollection.HandleCu rrenthemChangeOfSo...

sender, EventArgs args)

at

Telerik.Windows.Data.DataltemCol lection,Telerik.Wi ndows.Data.lWeakEve...

sender, EventArgs args)

at Telerik.Windows.Data.WeakEvent.WeakListener’1.Ha ndler(Object

sender, TArgs args)

at Telerik.Windows.Data.QueryableCollectionView.RaisePageChangedo

at

Telerik.Windows.Data.QueryableCollectionView.CompletePageMove(1nt32

newPagelndex)

at

Telerik.Windows.Data.QueryableCollectionView.MoveToPageCore(1nt32

pagelndex)

at Telerik.Wi ndows.Data.QueryableCollectionView.MoveToPage(1nt32

pagelndex)

at Teleri k.Wi ndows.Data.QueryableCollectionView.End DeferQ

at Teleri k.Wi ndows.Data.QueryableCollectionView.DeferHelper.DisposeQ

at Telerik.Windows.Data.DataltemCollection.EndDeferO

at Telerik.WindowsData.DataltemCollection.DeferHelper.DisposeO

at

Telerik.Windows.Controls.GridView.GridViewDataControl.PerformGroupin...

descriptor, Nullable’1 insertionlndex, GroupingEventAction action)

at

Telerik.Windows.Controls.GridView.GridViewDataControl.< > c_DisptayCl...

at

 

 

 

[Rossen Hristov]

Hello Dan,

Can you try to bind them in the opposite way. In other words, bind the grid to the original collection and then bind the pager to RadGridView.Items.

Is there a change in the behavior?

All the best,
Ross
the Telerik team