VirtualQueryableCollectionView and VirtualItemCount

[ss]

Hello,

I use followinf code:

1.RadTreeListView rr = new RadTreeListView();
2.
3.VirtualQueryableCollectionView v = new VirtualQueryableCollectionView();
4.v.LoadSize = 10;
5.v.VirtualItemCount = 20;
6.v.ItemsLoading += (s, eee) => { };
7.
8.rr.ItemsSource = v;

I dont know why but "rr.ItemsSource = v" raises ArgumentNullException (Value cannot be null., Parameter name Key). If  I use RadGridView everythings works fine.

Can you please help me.

Thank you.

[Vlad]

Hello,

 RadTreeListView currently is not supported - we will do our best to include support as soon as possible. 

Sincerely yours,
Vlad
the Telerik team

[ss]

Could you please tell me approximately when?

Thank you.

[Vlad]

Hello ss,

 Our initial target is Q1 2011 (early March most probably) - the main problem comes from the fact that we need to define (and implement) clearly hierarchical data virtualization (the case with RadTreeListView). 

Kind regards,
Vlad
the Telerik team

[Eugene]

Hi guys,

Is there any news about virtualization for  RadTreeListView? It looks like the recent release doesn't contain any fixes. I'm still getting  ArgumentNullException.

Regards.

[Vlad]

Hi Eugene,

 Unfortunately we were unable to include any improvements regarding Data Virtualization and RadTreeListView. The task is not trivial since in this case we need to virtualize (and flat) hierarchical data however keep the sorting, filtering, etc. hierarchically. 

Kind regards,
Vlad
the Telerik team

[ss]

Will the next version have this functionality? We are still eagerly awaiting.

[Rob Conley]

When you say "not supported", you mean that the RadTreeListView cannot be used with the VirtualQueryableCollectionView, correct?

Any recent updates on this or is this the way it is for the foreseeable future?

[Vlad]

Hello,

 Indeed the treelist (the latest version as well) cannot be used with the virtual collection.

Greetings,
Vlad
the Telerik team