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VirtualQueryableCollectionView and VirtualItemCount

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TreeListView
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ss
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ss asked on 16 Nov 2010, 04:13 PM

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.

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Vlad
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answered on 16 Nov 2010, 04:20 PM
Hello,

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

Sincerely yours,
Vlad
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ss
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answered on 16 Nov 2010, 04:49 PM

Could you please tell me approximately when?

Thank you.

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Vlad
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answered on 16 Nov 2010, 04:58 PM
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
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Eugene
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answered on 18 Jul 2011, 04:15 PM
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.

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Vlad
Telerik team
answered on 19 Jul 2011, 07:14 AM
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
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ss
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answered on 02 Aug 2011, 03:04 PM
Will the next version have this functionality? We are still eagerly awaiting.
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Rob Conley
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answered on 08 Jan 2013, 08:26 PM

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?
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Vlad
Telerik team
answered on 09 Jan 2013, 07:53 AM
Hello,

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

Greetings,
Vlad
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