Xceed Ultimate ListBox for Silverlight and WPF

Re: IndexDataSource retrival of items using scrolling

Michel [Xceed] — Wed, 08 Jun 2011 14:41:26 GMT

Our products include a technology we call "active prefetching" and "passive prefetching" that intentionally prefetches data outside the current view of the ListBox in order to respond quickly to the user's page/line up/down requests. The amount of "prefetch rows" is determined baseed on the user's scrolling behavior.

You can always disable this prefetching behavior by setting the DataSourceProvider.BufferConfiguration property to "null". (v1.3 or later only)

Re: IndexDataSource retrival of items using scrolling

ashfaq — Tue, 07 Jun 2011 17:37:53 GMT

HI Michel

I am trying to understand the behavior of IndexDataSource. Is it supposed to load items based on scroll position or it would load all items (after applying filter) based on QueryInterval and batch size

Re: IndexDataSource retrival of items using scrolling

Michel [Xceed] — Wed, 01 Jun 2011 16:46:58 GMT

Hi Ashfaq,

Are you referring to the IndexDataSourceProvider provided at this post:

http://xceed.com/CS/forums/thread/29497.aspx

If yes, an IndexDataSourceProvider is provided with the products, you can find more information in the same thread. And you can refer to the RemoteListDataSources sample for an example that you can use.

If not, can you send us a sample application that shows your implementation so that we investigate this in more detail?

IndexDataSource retrival of items using scrolling

ashfaq — Tue, 31 May 2011 20:10:37 GMT

I have a framework that does not use WCF or RIA services. I have implemented the IndexDataSourceProvider, which works fine for the initial Data retrieval but instead of loading items based on the scroll position it loads items at regular intervals based on QueryRequestInterval.

Regards

Ash