Virtualization with multiselection

[jura]

I am using VirtualQueryableCollectionView with RadGridView and at the same time multiselection mode.

It was already discussed previously with no real solution as far as I know.

When select all (Ctrl+A) is called, all items are loaded into memory which defeats the virtualization and is useless.

So what are the possibilities to fix it?

• Use single selection mode, which is not a solution.
• Use indexes instead of items.
• Use item identifiers if available instead of items.
• Use proxied item objects with knowledge of loaded state and internally loadable when required, which is quite complex.
• Limit ​maximum number of selected items to reasonable value (LoadSize) and add selection events based on indices.

Just my thoughts. I think I will take the last way... and You?

 

Marek Ištvánek

[Dimitrina]

Hello Marek,

We had such a request on the feedback portal, and the development team rejected it due to the stated reason: Cannot extended select all the items when GridView is bound to VirtualQueryableCollectionView.

Regards,
Dimitrina
Telerik

[jura]

Well, that is not the reason for me ;-)

The best solution I see now is to have SelectedIndexes and AllowSelectedItems on GridView so that when AllowSelectedItems is false, SelectedItems will be ignored and only SelectedIndexes will be updated.

This is doable.

 

Marek

[Dimitrina]

Hello,

Thank you for sharing your solution with the community here and also updating the feedback item so that other clients can also benefit from it. 

Regards,
Dimitrina
Telerik