Combobox multi-selection: SelectedItems.Add(item) has very poor performance

[minh]

Hi everyone,

 

I have a problem when adding the items into selectedItems of a multi-selection combobox: it take too long (around 30 seconds) to add a list of 260 items.

Is there any possibility to improve that situation?

Many thanks for your help,

Minh tuan

 

[Martin Ivanov]

I've tried this, but I couldn't reproduce the issue. Can you check the attached project and let me know if I am missing anything?

[minh]

Hi Martin,

Many thanks for your prompt reply and sample project.

Please find the attached project which simulate more our current situation. In fact, we work on an object of comboItem which has a structure and also we must add a FirstOrDefault() query to make sure we add the corresponding item.

Many thanks for your help

Minh Tuan.

[Martin Ivanov]

Thank you for the project. On my side I got a 4 seconds delay when clicking on the button. I've tested this also with a virtualization panel and this seems to improve the performance. You can try to replace the default panel with a VirtualizingStackPanel and see if this helps.

<telerik:RadComboBox.ItemsPanel>
	<ItemsPanelTemplate>
		<VirtualizingStackPanel />
	</ItemsPanelTemplate>
</telerik:RadComboBox.ItemsPanel>

[Alexander]

Any updates on this issue. We faced with the same problems in our project.