Virtualization loads all items for each group

2 posts, 0 answers
  1. Markus
    Markus avatar
    13 posts
    Member since:
    Sep 2013

    Posted 28 Aug 2014 Link to this post

    I bound a RadGridView to a VirtualQueryableCollectionView backed by SQL using System.Data.Linq.ITable.

    At first Virtualization works nicely as I see that the LoadSize is submitted to the SQL provider (tracing SQL queries).
    Once I add grouping (dragging a column into the grouping panel) all rows for each group are loaded. 

            <telerik:RadGridView x:Name="Table" ItemsSource="{Binding Data}" AutoGenerateColumns="False" IsReadOnly="True" 
                                 Height="500" Width="500"
                                 CanUserInsertRows="False" CanUserDeleteRows="False"
                                 EnableRowVirtualization="True" EnableColumnVirtualization="True"

    Is UI virtualization supported in a group scenario? Am I missing some settings?
  2. Dimitrina
    Dimitrina avatar
    3769 posts

    Posted 29 Aug 2014 Link to this post


    The default grouping is the one that occurs as the user drags a column header and drops it into the GroupPanel. Then, we internally generate and execute a LINQ query appending a GroupBy clause to the source collection.

    WCF RIA Services do not support true server-side grouping. They translate it to sorting instead. The grouping is done solely on the client by RadGridView and that why all the items need to be downloaded.

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