Deferred Scrolling and VirtualQueryableCollectionView

2 posts, 0 answers
  1. Lee
    Lee avatar
    3 posts
    Member since:
    Mar 2014

    Posted 21 Feb 2018 Link to this post


    We are currently migrating our current Silverlight / Telerik app to WPF and we have noticed a difference in how often the database is queried when scrolling using the deferred scrolling approach.

    In the Silverlight implementation the database seems to only be queried when we let go of the mouse button and it does its skip / take then thus only a single DB hit.

    In the WPF version using the same approach yields multiple DB hits whilst dragging the mouse down the scrollbar.

    s this intentional / is there an option we have missed to get back to the same way the Silverlight implementation was working as it is impacting the performance of our app and the scrolling at this point.

    Many thanks in advance


  2. Vladimir Stoyanov
    Vladimir Stoyanov avatar
    355 posts

    Posted 26 Feb 2018 Link to this post

    Hello Lee,

    I am afraid I cannot be sure of the reason for the described behavior without being familiar with your particular implementation. That is why I prepared a sample project using the Northiwind database and the RadGridView control. May I kindly ask you to modify it in order to resemble your scenario and send it back in a new support ticket? Alternatively you can send over a sample project of your own. This way I will be able to test it on my side and better assist you. 

    Thank you in advance for any help you can provide.

    Vladimir Stoyanov
    Progress Telerik
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