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Cannot Attach An Entity That Already Exists

One problem that I can't seem to resolve with the data context is how to update Entities based on POCO objects that didn't originate out of the DataContext. You’ll be auto redirected in 1 second. bzburns August 13, 2007 # re: LINQ to SQL and attaching Entities The databinding numbers are staggering. Why was Susan treated so unkindly? http://gpscheduler.com/cannot-attach/cannot-attach-an-entity-that-already-exists-deleteonsubmit.html

It is urgent, thanks! Is there a name for the (anti- ) pattern of passing parameters that will only be used several levels deep in the call chain? I resolved this issue by initializing the datacontext object in each iteration. ying515_huang Posts: 13Joined: Mon 21 Feb 2011 03:35 Top by ying515_huang » Tue 22 Feb 2011 05:41 ying515_huang wrote:StanislavK wrote:This is a peculiarity of LinqConnect identity tracking: entities are attached http://stackoverflow.com/questions/2605657/cannot-attach-an-entity-that-already-exists

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It's rather easy once you know how to do it:http://christophekeller.blogspot.com/2010/02/linq-to-sql-updating-reattached-entity.html Rick Strahl February 12, 2010 # re: LINQ to SQL and attaching Entities @Christophe, uhm not really. more hot questions question feed lang-cs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Join them; it only takes a minute: Sign up Cannot attach an entity that already exists up vote 6 down vote favorite 1 I am trying to update code via Linq, Depalindromize this string!

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I agree that it can quickly become cumbersome if you need to reattach more than the main entity and maybe a single child collection. http://forums.asp.net/t/1420514.aspx?Cannot+attach+an+entity+that+already+exists+ Post a reply 18 posts • Page 1 of 2 • 1, 2 Cannot attach an entity with the key that already exists. Buy Download Event Profiler for SQL Server Event Profiler for SQL Server Convenient GUI to SQL Trace for inspecting SQL Server Database Engine instance. Jeremy January 24, 2008 # re: LINQ to SQL and attaching Entities It seems like you're all trying to do LinQ-to-Entities functionality only using LINQ-to-SQL instead.I'd recommend checking out the the

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Steve August 13, 2007 # re: LINQ to SQL and attaching Entities That whole 'playback' model seems quirky to me.So, I make an update to an object, let's say from that Consider making a small donation to show your support. We already buy dotConnect for Oracle. check over here Let's work to help developers, not make them feel stupid.

I changed one method signature and broke 25,000 other classes. Kanakala August 06, 2008 # re: LINQ to SQL and attaching Entities hi,I had the same problem in my application. Browse other questions tagged c# model-view-controller or ask your own question.

To implement the approach you've described, you can use another DataContext instance for the update operation: Code: Select allU ent = (U)Translator.FromEntity(entity);
MyDataContext newContext = new MyDataContext();
newContext.UpdatableTable.Attach(ent, true);

Browse other questions tagged c# linq-to-sql or ask your own question. Not the answer you're looking for? It works for single entities but if you have child entities or collections you'll find that those don't update properly. So, is this the way it's supposed to work or a bug?

However the following error occurs when saving Cannot attach an entity that already exists. I added a timestamp field to all tables - re-added them, checked the generated classes that the timestamp field is recognized as a timestamp. Download Search Search A FREE add-in for SQL Server Management Studio that allows you to quickly search SQL objects and data in your databases. this content it has worked out well for me ...

Leo H November 21, 2008 # re: LINQ to SQL and attaching Entities Has anyone implemented Rick's suggestion of looping through the properties and assigning only when the property values differt? Could you please describe the situation in more details so that we are able to suggest a solution or a temporary workaround? That means it needs to verify that the database state has not changed before it can perform either. My scenario is like this I do var res = (from i in Table where i.Query == query && i.SessionId == sessionId select new UserUniChoice(i)).FirstOrDefault(); then work with UserUniChoice object which

I've noted our findings here:http://community.omnicom.no/blogs/lea/archive/2008/04/25/updating-objects-with-linq-on-a-different-datacontext-instance.aspx Sorin May 02, 2008 # re: LINQ to SQL and attaching Entities Solution posted by Rui Santos doesn't check for a concurent change to the data