DevForce Community Forum : Force Refresh of Navigation Properties http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2009 : Force Refresh of Navigation Properties Tue, 28 Apr 2026 22:45:55 -700 Tue, 15 Sep 2009 14:04:20 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=1468 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Force Refresh of Navigation Properties : Ken:I haven't tested this,... http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5391#5391 Author: GregD
Subject: 1468
Posted: 15-Sep-2009 at 2:04pm

Ken:

I haven't tested this, but I'm told that Reload does work in SL, the same as the usual (implicit) load of related entities – it will be performed asynchronously if the UseAsyncNavigation flag is true on the EntityManager, which it will be for a SL app.  This means that you will either need to have a handler in place for PendingEntityListResolved, or check the IsPendingEntityList flag, to determine when the list is reloaded.

Greg

]]> Tue, 15 Sep 2009 14:04:20 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5391#5391 Force Refresh of Navigation Properties : Originally posted by ken.nelsonIs... http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5388#5388 Author: GregD
Subject: 1468
Posted: 15-Sep-2009 at 10:21am

Originally posted by ken.nelson

Is it possible that this feature works in syncronous win forms but not in asynchronous Silverlight apps?  Truthfully I was a bit surprised there wasn't a ReloadAsync() method.


Oh, sorry, I wasn't paying attention to which forum we're in.  Of course it would need to be async. Perhaps we've simply not implemented that yet, in which case you'd just have to do a normal async query to refresh the related entities. I'll check into it.
]]> Tue, 15 Sep 2009 10:21:50 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5388#5388 Force Refresh of Navigation Properties : The merge strategy we're... http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5385#5385 Author: ken.nelson
Subject: 1468
Posted: 15-Sep-2009 at 6:47am

The merge strategy we're using is OverwriteChanges, so that shouldn't be the problem. 
 
I can't speak for a win form console application version because I didn't test that.  Is it possible that this feature works in syncronous win forms but not in asynchronous Silverlight apps?  Truthfully I was a bit surprised there wasn't a ReloadAsync() method.
 


Edited by ken.nelson - 15-Sep-2009 at 6:48am]]> Tue, 15 Sep 2009 06:47:26 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5385#5385 Force Refresh of Navigation Properties : Reload() should do it, and it... http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5382#5382 Author: GregD
Subject: 1468
Posted: 14-Sep-2009 at 2:46pm

Reload() should do it, and it seems to work for me.  I tested it as follows in a console app against NorthwindIB:

    private void DoIt() {
      Order anOrder = _mgr.Orders.FirstOrDefault();
      Console.WriteLine("Order Id = {0}; No. of OrderDetails = {1}", anOrder.OrderID, anOrder.OrderDetails.ToList().Count());
      Console.WriteLine("Pause here and add an OrderDetail to this outside of this program...");
      PromptToContinue();
      anOrder.OrderDetails.Reload(MergeStrategy.PreserveChanges);
      Console.WriteLine("Order Id = {0}; No. of OrderDetails = {1}", anOrder.OrderID, anOrder.OrderDetails.ToList().Count());
      PromptToContinue();
    }

    private void PromptToContinue() {
      Console.WriteLine();
      Console.WriteLine("Press ENTER to continue...");
      Console.ReadLine();
    }

At the first PromptToContinue(), while execution was paused, I manually changed the OrderId in one or more of the records in the OrderDetail backing table, in such a way as either to add or remove an OrderDetail from the OrderDetails collection of anOrder. The second output of the OrderDetails count shows the change. I tested it both for an increased and a decreased collection, thinking that maybe it only reloaded entities it already had, but it does pick up newly added children as well.

Of course, the way Reload handles externally made changes to an entity that's already in the collection depends upon the MergeStrategy you use. If you use PreserveChanges, for example, then in the case of an entity that has changed both in the cache and externally, you would not pick up the external changes.

]]> Mon, 14 Sep 2009 14:46:56 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5382#5382 Force Refresh of Navigation Properties : Hi, Is there any way to force... http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5369#5369 Author: ken.nelson
Subject: 1468
Posted: 11-Sep-2009 at 1:28pm

Hi,
 
Is there any way to force a refresh/refetch of a navigation property?  I've tried a few things, and the most promising appeared to be something along the lines of customer.Orders.Reload(MergeStrategy.OverwriteChanges), but it didn't appear to work.
 
I worked around it by removing the entity from the entity manager, then requerying for the same entity, but that seems less than ideal.  Is there a better way of doing this?
 
Thanks,
Ken
]]> Fri, 11 Sep 2009 13:28:00 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1468&PID=5369#5369