DevForce Community Forum : Detecting changes to a new Entity http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2009 : Detecting changes to a new Entity Mon, 13 Apr 2026 16:58:23 -700 Thu, 04 Mar 2010 12:23:09 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=1663 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Detecting changes to a new Entity : Thanks for the reply, David. So,... http://www.ideablade.com/forum/forum_posts.asp?TID=1663&PID=6288#6288 Author: chuckc
Subject: 1663
Posted: 04-Mar-2010 at 12:23pm

Thanks for the reply, David.

So, it sounds like the EntityAspect property of a DevForce entity just returns the underlying EntityFramework entity.

That seems to imply that the upcoming April version of DevForce that supports Entity Frameworks 4.0 will have the improved self-tracking features that are supposed to be coming in EF4, as discussed here:

http://www.develop.com/entityframework4

Can I get a beta copy of DevForce for EF4?]]> Thu, 04 Mar 2010 12:23:09 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1663&PID=6288#6288 Detecting changes to a new Entity : EntityAspect.HasChanges() is currently... http://www.ideablade.com/forum/forum_posts.asp?TID=1663&PID=6287#6287 Author: davidklitzke
Subject: 1663
Posted: 04-Mar-2010 at 10:43am

EntityAspect.HasChanges() is currently working as designed.

If you want different semantics, you will have to handle it yourself.  For example, if you want to know if an entity has changed since it was initially created, you could add an additional property to the entity such as ChangedAfterCreated.  You would first set the value of this property to false when you created the entity.  You could then add a PropertyChanged event handler to handle the ChangedAfterCreated property.
]]> Thu, 04 Mar 2010 10:43:23 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1663&PID=6287#6287 Detecting changes to a new Entity : Hopefully this is a simple question... http://www.ideablade.com/forum/forum_posts.asp?TID=1663&PID=6271#6271 Author: chuckc
Subject: 1663
Posted: 27-Feb-2010 at 4:39pm

Hopefully this is a simple question to answer.

When creating a new object/Entity, how does one skip attempting to save it if it has not been modified? I'm trying to add some logic into a Saving event handler, but EnityAspect.HasChanges() seems to always return true as soon as an object has been created, even before any properties have been modified.   AcceptChanges() and RejectChanges() seem to have no effect.

Employee e = _manager.CreateEntity<Employee>();
// e.EntityAspect.HasChanges() == true

e.EntityAspect.AcceptChanges();
// e.EntityAspect.HasChanges() == true

e.EntityAspect.RejectChanges();
// e.EntityAspect.HasChanges() == true

The above code behaves the same even when the Employee is created with a simple constructor, e.g. Employee e = new Employee();

Is there some other technique that you recommend?

Thanks.]]> Sat, 27 Feb 2010 16:39:33 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1663&PID=6271#6271