DevForce Community Forum : ListManager delegate not detecting deletes http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce Classic : ListManager delegate not detecting deletes Tue, 14 Apr 2026 06:46:11 -700 Mon, 16 Feb 2009 15:26:42 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=1091 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ ListManager delegate not detecting deletes : Originally posted by mriversI've... http://www.ideablade.com/forum/forum_posts.asp?TID=1091&PID=3920#3920 Author: GregD
Subject: 1091
Posted: 16-Feb-2009 at 3:26pm

Originally posted by mrivers

I've created a ListManager who's delegate always returns true when an entity being managed by the ListManager changes or is added. I would also like the delegate to catch any deletions of the managed entity type. Do I have to do something different to be able to detect the deletions?
 
Here is my code snippet:
........................................................
mEntityList = pManager.PersistenceManager.GetEntities<Property_Entity>(pQuery);
Predicate<Property_Entity> predicate =
delegate(Property_Entity pType)
{
return true;
};
 
mEntityList.ListManager = new EntityListManager<Property_Entity>(pManager.PersistenceManager,
predicate,
new EntityColumn[] { Property_Entity.PropertyidEntityColumn, Property_Entity.PresentvalueEntityColumn, Property_Entity.LiquidEntityColumn });
.............................................



Originally posted by mrivers


Do I have to do something different to be able to detect the deletions?


1. DevForce removes deleted entities from EntityLists as a matter of course: no EntityListManager required.  What contrary behavior are you seeing?

2. EntityListManagers can be expensive, performance-wise, if overused and/or defined inefficiently. The EntityListManager you've defined looks somewhat inefficient in that, since you've said *any* entity of the specified type belongs in the list (no exclusionary criteria in the predicate), I don't see what the point is of monitoring the Presentvalue and Liquid entity columns. The test on the PropertyidEntityColumn will already guarantee that any new instance of Property_Entity will get included in your list; and there's no change to either a Presentvalue or Liquid property that would cause an entity already in the list to be removed from it.

]]> Mon, 16 Feb 2009 15:26:42 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1091&PID=3920#3920 ListManager delegate not detecting deletes : I&#039;ve created a ListManager... http://www.ideablade.com/forum/forum_posts.asp?TID=1091&PID=3911#3911 Author: mrivers
Subject: 1091
Posted: 11-Feb-2009 at 12:54pm

I've created a ListManager who's delegate always returns true when an entity being managed by the ListManager changes or is added. I would also like the delegate to catch any deletions of the managed entity type. Do I have to do something different to be able to detect the deletions?
 
Here is my code snippet:
........................................................
mEntityList = pManager.PersistenceManager.GetEntities<Property_Entity>(pQuery);
Predicate<Property_Entity> predicate =
delegate(Property_Entity pType)
{
return true;
};
 
mEntityList.ListManager = new EntityListManager<Property_Entity>(pManager.PersistenceManager,
predicate,
new EntityColumn[] { Property_Entity.PropertyidEntityColumn, Property_Entity.PresentvalueEntityColumn, Property_Entity.LiquidEntityColumn });
.............................................
]]> Wed, 11 Feb 2009 12:54:30 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1091&PID=3911#3911