RadListBox and Select All performance issue

[Andrey]

Hi, 

We have RadListBox control with custom ItemTemplate and ItemsPanelTemplate as VirtualizingWrapPanel. For example, in the case when the count of bound items is equal to 30k and a user wants to "Select all" with Ctrl+A, the program hangs for almost 5 seconds.

I made an investigation and found, that the issue related to a check statement "does this item present in collection"  inside SelectionChanger and it takes more than 92% of the execution time.

I am attaching the call tree after performance profiling:

 

Do you have any workaround for that or any good advice on how the issue might be solved?

Thank you in advance!

 

BR,

Andrew

 

[Dilyan Traykov]

Hi Andrew,

Thank you for the provided profiling result.

Looking at the source code of the SelectionChanger<T> class, I do believe there is room for optimization in this specific scenario. I have thus logged a new feature request in our feedback portal on your behalf regarding it.

I'm afraid, however, that I cannot suggest a viable workaround for the time being. You can, however, follow the feedback item to get notified about any updates in its status.

If I can further assist you with anything else, please let me know.

Dilyan Traykov
Progress Telerik