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ShouldLoadEntityRefs

Printed From: IdeaBlade
Category: DevForce
Forum Name: DevForce 2009
Forum Discription: For .NET 3.5
URL: http://www.ideablade.com/forum/forum_posts.asp?TID=1603
Printed Date: 05-Apr-2025 at 11:00pm


Topic: ShouldLoadEntityRefs
Posted By: robdrye
Subject: ShouldLoadEntityRefs
Date Posted: 30-Dec-2009 at 4:18am
I have been unable to get the ShouldLoadEntityRefs behavior to work as expected in the SL environment.  I have a simple scenario where a parent entity gets loaded from a sproc and a collection of its child entities gets loaded directly from a db table.  When executing this scenario (and identical code) inside the regular .NET environment everything works as expected - the parent gets loaded along with the collection of its child entities however when switching over to SL the child entities collection consistenly comes back empty. 
 
Thanks for your help.


Replies:
Posted By: GregD
Date Posted: 05-Jan-2010 at 10:43am
In Silverlight, all data retrieval is done asynchronously. A collection of child entities will initially show as empty, but you can set up a handler for the collection navigation property's PendingEntityListResolved event to receive notification when the entities have been retrieved into the cache. Are you doing that?

It is also possible to bind the collection navigation property to UI controls (e.g., a DataGrid), in which case the UI controls will be notified when the collection to which they are bound changes and will automatically refresh.

Posted By: robdrye
Date Posted: 12-Feb-2010 at 9:27am

Thanks for the response Greg and sorry I did not follow up sooner.

Revisiting the PendingEntityListResolved event uncovered our issue and more importantly made us realize that our initial approach to the data fetch scenario mentioned in this post was far from ideal.  We were able to refactor a few things and simplify our approach back to just using straight DF LINQ queries.
 
Thanks again for your help.
 

Posted By: GregD
Date Posted: 12-Feb-2010 at 3:09pm
You're quite welcome, Rob! Straight LINQ sounds good! 8-)


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