DevForce Community Forum : PropertyChanged not firing http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2010 : PropertyChanged not firing Sun, 12 Apr 2026 23:54:05 -700 Thu, 23 Feb 2012 18:09:50 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=3281 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ PropertyChanged not firing : Hi samir,I don't claim to... http://www.ideablade.com/forum/forum_posts.asp?TID=3281&PID=12772#12772 Author: DenisK
Subject: 3281
Posted: 23-Feb-2012 at 6:09pm

Hi samir,

I don't claim to know exactly what's going on but I do know that the EntityManager is not thread-safe. See http://drc.ideablade.com/xwiki/bin/view/Documentation/entitymanager-not-thread-safe.

In general, we don't recommend that you work with multiple threads when using the EntityManager.

If you have a need to batch asynchronous queries, you can try DevForce Coroutines. See http://drc.ideablade.com/xwiki/bin/view/Documentation/coroutines

My suggestion for now is to convert your first 4 queries to use Coroutines instead of Task and see if you're still experiencing the same issue.

Hope this helps.
]]> Thu, 23 Feb 2012 18:09:50 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3281&PID=12772#12772 PropertyChanged not firing : Hi Denis, Here it is: ... http://www.ideablade.com/forum/forum_posts.asp?TID=3281&PID=12750#12750 Author: samir
Subject: 3281
Posted: 23-Feb-2012 at 5:56am

Hi Denis,

Here it is:

         var taskSistema =DataRepository.ExecuteQueryTaskAsync(DataRepository.GetQuery<Sistema>());

         taskSistema.Wait();

 

         var taskRevendas =DataRepository.ExecuteQueryTaskAsync(DataRepository.GetQuery<Revenda>());

         taskRevendas.Wait();

 

         var taskFornecedores =DataRepository.ExecuteQueryTaskAsync(DataRepository.GetQuery<Fornecedor>());

         taskFornecedores.Wait();

 

         var taskTransportadoras =DataRepository.ExecuteQueryTaskAsync(DataRepository.GetQuery<Transportadora>());

         taskTransportadoras.Wait();

 

And therespective DataRepository methods:

 

        public IQueryable<T> GetQuery<T>() where T : Entity

        {

            return Manager.GetQuery<T>();

        }

        public Task<List<T>> ExecuteQueryTaskAsync<T>(IQueryable<T>query) where T : Entity

        {

            var tcs = newTaskCompletionSource<List<T>>();

 

            Task.Factory.StartNew(() =>

                                     {

                                         Manager.ExecuteQueryAsync((EntityQuery<T>) query, operation =>

                                                                                               {

 

                                                                                                   if (operation.CompletedSuccessfully)

                                                                                                       tcs.SetResult(operation.Results.ToList());

                                                                                                   else

                                                                                                   {

                                                                                                       operation.MarkErrorAsHandled();

                                                                                                        tcs.SetException(operation.Error);

                                                                                                   }

                                                                                                });

                                     });

            return tcs.Task;

        }

Examining the code I now see that the Manager.ExecuteQueryAsync doesn´tneed to be inside the Task.Factory.StartNew. So I made the change but the issueis still present. Any ideas?

 

]]> Thu, 23 Feb 2012 05:56:21 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3281&PID=12750#12750 PropertyChanged not firing : Hi Samir,This sounds like a threading... http://www.ideablade.com/forum/forum_posts.asp?TID=3281&PID=12741#12741 Author: DenisK
Subject: 3281
Posted: 22-Feb-2012 at 2:37pm

Hi Samir,

This sounds like a threading issue. Could you provide me with a code snippet of the 4 parallel queries?

Thanks.
]]> Wed, 22 Feb 2012 14:37:30 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3281&PID=12741#12741 PropertyChanged not firing : Hello.I´m having a situation... http://www.ideablade.com/forum/forum_posts.asp?TID=3281&PID=12722#12722 Author: samir
Subject: 3281
Posted: 21-Feb-2012 at 1:57pm

Hello.
 
I´m having a situation where sometimes when I run my application my entities don´t fire the PropertyChanged event after startup. Investigating the issue with Reflector I discovered that the method QueueEvent(Action action) in the EntityGroup class is called with an action to raise the event, but due to EntityManager.IsLoadingEntity being true, the action gets queued and never executes.
 
It seems IsLoadingEntity is set to true in the constructor of LoadingBlock and the original value is restored when this object is disposed.
 
As I have about 4 parallel queries running in my application startup, I believe that one LoadingBlock is being instantiated after a previous LoadingBlock had set EntityManager.IsLoadingEntity to true but have not been disposed yet, thus this if this new LoadingBlock ends after the first, it sets IsLoadingEntity to true and it remains true forever.
 
PS: I´ve checked that every LoadingBlock instantiated is being disposed.
 
Does any of this make sense?
 
Thanks,
Samir Zattar


Edited by samir - 21-Feb-2012 at 2:02pm]]> Tue, 21 Feb 2012 13:57:39 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3281&PID=12722#12722