DevForce Community Forum : Collection was modified; enumeration operation may not execute http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce Classic : Collection was modified; enumeration operation may not execute Fri, 12 Jun 2026 07:11:40 -700 Thu, 12 Jul 2007 12:33:46 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=161 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Collection was modified; enumeration operation may not execute : You need to use "IterIsolate".... http://www.ideablade.com/forum/forum_posts.asp?TID=161&PID=347#347 Author: IdeaBlade
Subject: 161
Posted: 12-Jul-2007 at 12:33pm

You need to use "IterIsolate".  While you are iterating throught a collection, you may not modify it.  I ran into the same problem a year ago when I did the tutorial on Audit Trails.  I had a ColumnPropertyChanged Event Handler that fired while entities were being saved.  This event handler created new entities while the current set of inserted, deleted, or modified entities were being saved, thus modifying the list of saved entities.

]]> Thu, 12 Jul 2007 12:33:46 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=161&PID=347#347 Collection was modified; enumeration operation may not execute : Sorry to bother you, but I have... http://www.ideablade.com/forum/forum_posts.asp?TID=161&PID=346#346 Author: Customer
Subject: 161
Posted: 12-Jul-2007 at 12:33pm

Sorry to bother you, but I have not been successful at deleting a collection of entities, I have tried variation of the following two, but all cases I get the same error. What am I doing wrong?

System.InvalidOperationException was unhandled

Message="Collection was modified; enumeration operation may not execute." 

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