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Cannot Attach An Entity That Already Exists Deleteonsubmit

Browse other questions tagged c# linq or ask your own question. However, the point is moot if it's complaining about the PK being duplicated in all scenerarios. Julie Lerman Blog September 02, 2007 # Exploring EntityKeys, Web Services and Serialization a little further john gibbons December 18, 2007 # re: LINQ to SQL and attaching Entities what makes All rights reserved. weblink

Dim db As personalDataContext = New personalDataContext For i = 0 To 3 - 1 Dim p As New personal p.name = "Mick" p.number = "01213" Dec 30, 2007 08:07 AM|imperialx|LINK Hello, Why do I receive this error "Cannot add an entity that already exists." I'm trying to add three data at one call using 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 If you don't then optimistic concurrency cannot be performed, so you get an exception.

Great post Rick! I assume it's SQL server but just for clarity. using (var context = GetContext()) { Company company = new Company(companyId); context.Companies.Attach(company); company.UserName = userName; company.Password = password; company.EMail = email; company.Notes = notes; context.SubmitChanges(); }First, the Attach should be called

Here it is: I am now opening and closing a new data context in all my Adders and Removers, like this: public static void Add(CPlanta floor) { a member that is not set or checked for optimistic concurrency is ignored.<

Sep 24, 2008 02:57 AM|faizan.shahensha|LINK whenever you try to save new record always instantiate the object of class first. Josimari July 16, 2009 # re: LINQ to SQL and attaching Entities Link to Sql - Problems on Updating DatabaseHello Everyone, I'm quite new to Linq and have had some problems I am new at LINQ to Sql, and I've noticed that the Properties that we need to assign are decorated with the [Column] attribute. Huh?

Insults are not welcome. Calling Attach with just an object instance only provides enough information to let the DataContext pretend the object was just materialized into an unmodified state (as if by querying.) That's why 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 Also, you are getting at least 1 record inserted what is the primary key value for that?

Do you need your password? http://rainstorms.me.uk/blog/2009/06/23/linq-to-sql-quirks-part-2-deleteonsubmit-and-entity-not-attached/ Reply Dave Lowther says: 5 January 11 at 7:07 pm Thanks, this saved me some (more) misery. Entity Framework for Existing Database Update existing entity from database Advertise | Privacy | Mobile Web01 | 2.8.161101.1 | Last Updated 20 May 2015 Copyright © CodeProject, 1999-2016 All Rights Reserved. DateTime values run the risk of DLS changes and I'm not sure how this affects "timestamp" datatypes.

Monday, March 15, 2010 8:41 AM Reply | Quote Answers 0 Sign in to vote I agree that having to create a temporary ParkHelpDatabaseDataContext object just to do these changes shouldn't have a peek at these guys or have I been in the sun too long...Underlying this is the real question: "how to get back just one record in the first place".RegardsRob Kristian Ravndal May 06, 2010 # I resolved this issue by initializing the datacontext object in each iteration. I'm having a Note entity that has an Auto generated Key of type int.

phDatabase is my database context object, and it's a global member. Rui Santos February 02, 2008 # re: LINQ to SQL and attaching Entities Hy, a resolve my problems with updates using 2 differents "connections"Like this:public bool Update(tt_customer customer) { context = Now although I don't think this is great it's not as terrible as it might sound given that the DataContext is not actually connected to the database - all data access check over here Word for "using technology inappropriately"?

Linq and WCF just don't seem to play very well together at all. cheers, imperialx Reply cheetahtech Member 168 Points 130 Posts Re: Cannot add an entity that already exists. Also you still end up with issues for child entities, which in the end is the real problem.It's interesting to see all the different approaches that have been mentioned in this

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While testing a new part of the application by deleting one of these items and recreating it, I got this message, even though the item is not in the database anymore. For i = 0 To 3 - 1 p.id = 0 p.name = "Mick" p.number = "01213" p.picture = "image/image.jpg" db.personals.InsertOnSubmit(p) db.SubmitChanges() Next ... If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site.Would you like to participate? After insert first record exception Generates.

Alex on ASP.NET April 03, 2008 # LINQ to SQL Entity Base - Disconnected LINQ LINQ to SQL Entity Base - Disconnected LINQ Lars-Erik April 25, 2008 # re: LINQ to It would explain the need to refresh as well. This is where the timestamp column comes in. this content And yes there is a potential workaround for this particular issue for some scenarios which involves just letting the business object hang on to the DataContext, which frankly is the more

What is exactly meant by a "data set"? CPlanta floor = new CPlanta(); floor.key_field = "Key-1"; floor.another_field = "Value"; Add (floor); // Add this line floor = new CPlanta(); floor.key_field = "Key-2"; floor.another_field = "Value"; Add (floor); Cheers,John. ctx.SubmitChanges(); return group; } }6. That worked well for adds and updates but when I was trying to delete child objects on my types, nothing happens.

You can leave a response, or trackback from your own site. 5 Responses to "Linq to SQL Quirks Part 2: DeleteOnSubmit and Entity not Attached" Linq to SQL Quirks Part 3