Infralution Support

[Happs]

Hi,

I am using virtual tree view to display large number of items.

My custom datasource class implements the IList interface and Count, Item, IndexOf() properties.

All working fine, I can see virtual tree loads on demand as scroll down.

Now I need to select an item in virtual tree, immediately after setting the datasource. For example, I need to select item number '7000' in the list.

I can do this by setting the 'SelectedItem' property, it works but I see delay loading items in virtual tree. I can see virtual tree loads all items from 1 to 7000.

Is my observation correct?

Is it possible to load just the numbers of items we need to display around the selected result? As user scroll up/down from item 7000, it will load more items.

I am using version 4.1.1.0.

Thanks.

[Infralution]

I don't think that is correct. Setting the SelectedItem causes VirtualTree to call IList.IndexOf to get the index of the given object in the list. Virtual Tree will then scroll to that location loading only those items required to display the page around that item. How have you implemented IList.IndexOf() ? If you are just looping through the elements looking for the item then you will of course end up loading all the previous elements.
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Infralution Support

[Happs]

Thanks for your comments.