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VirtualQueryableCollectionView Refresh problem on Windows10

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Data Virtualization

This is a migrated thread and some comments may be shown as answers.

DenisCL asked on 16 Jan 2017, 03:29 PM

silverlightdatavirtualisation_bug.png

Hi,

We are using VQCV (Telerik 2016.2.503.40) to virtualize data to RadGridView from the server side to client, sometimes the grid doesn't refresh correctly the new added items (we had a workaround with an explicit call to the .Refresh() function in the end of the data loading routine), unfortunately this causes a freeze of the main Thread on Windows10.

This problem exists also in the telerik Demo panel (see the attached file).

01.Task.Factory.StartNew(() =>

02.{

03. // Getting data from the server Side

04. return result;

05.

06.}).ContinueWith(finLazyLoading =>

07.{

08. // DataVirtualisationRoutine...

09.

10. MyVQCV.VirtualItemCount = collection.ItemsCount;

11.

12. MyVQCV.Load(currentOffset, collection.Items);

13.

14. // If we call the refresh here it occurs the bug on Win10 (total freeze of the app).

15.

16.}, TaskScheduler.FromCurrentSynchronizationContext()).ContinueWith(fixwin10 =>

17.{

18.

// This call causes an infinite loop... :(

19.

20. MyVQCV.Refresh();

21.

22.}, TaskScheduler.FromCurrentSynchronizationContext());

Can we have a fixe for this please or a working solution, we don't know how to do.

Thank you!

5 Answers, 1 is accepted

answered on 27 Jan 2017, 05:21 PM

Hello,

Thank you for your patience.

I've tried to reproduce the problem on our Silverlight demos and it seems you are right - there are missing items in the control (a blank space). However, I was able to reproduce it not on GridView example but in the TreeView (Binding to Various Controls). Moreover, I can't reproduce it constantly in the demo. However, I don't believe that this is your problem since your application is hanging and the scenario is with the Refresh method of the VQCV after inserting an item. Please note that the VirtualQueryableCollectionView is designed for ReadOnly purposes and it is not recommended to be used in scenarios where an update is needed as stated in VQCV's help article. However, I will be glad to see if we can assist you in your scenario. It will be great if you can isolate the hanging problem in a sample project which can be debugged on our side.

Regards,
Yoan
Telerik by Progress

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