Question

How to duplicate existing item in Linq C#?

Asked by: Dusan13

I need to duplicate certain elements in table and as the table is pretty long I'd rather duplicate them using linq and not assign column by column. However I'm not able to convince Linq to consider record as new. Is there any solution?

Note: .Id column is an identity based primary key.

using (DataContext db = new DataContext())
{
	{
		DataElement ExistingItem = (from c in db.DataElements select c).FirstOrDefault();                          		
		DataElement NewItem = new DataElement();
		NewItem = ExistingItem;
		NewItem.Id = 0;
		db.DataElements.InsertOnSubmit(NewItem);			
		db.SubmitChanges();
		}
}

                                  
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Asked On
2009-06-22 at 00:03:48ID24510376
Tags

c#

,

linq

,

asp.net

Topics

Language Integrated Query - LINQ

,

C# Programming Language

,

Microsoft Visual C#.Net

Participating Experts
2
Points
250
Comments
4

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Answers

 

by: naspinskiPosted on 2009-06-22 at 00:12:51ID: 24680249

I use a Clone() extension that I talk about here: http://naspinski.net/post/Cloning-an-Entity-in-Linq-to-Entities.aspx.  It worked with Linq-to-Entities, and Linq-to-SQL is almost always easier to work with, so it should not be hard to figure out.  I will try to take a look at it soon.

 

by: Dusan13Posted on 2009-06-29 at 00:12:17ID: 24734116

Hi naspinski, did you have a chance to try it with Linq for SQL? Thanks.

 

by: CodeCruiserPosted on 2009-06-29 at 04:26:36ID: 24735098

>NewItem = ExistingItem;

I think the above would only copy the reference of the existingitem to the newitem so LINQ would consider it an existing item and give as error. I think the solution is to implement the clone interface.

Here is some more info

http://www.c-sharpcorner.com/UploadFile/sd_surajit/cloning05032007012620AM/cloning.aspx

http://edndoc.esri.com/arcobjects/9.2/net/9915ff7d-f119-47ed-b381-cf7dded5cd93.htm

 

by: naspinskiPosted on 2009-06-29 at 23:17:31ID: 24742717

Sorry I totally forgot.  Just tried it out today and found a simple way to do it.  First thing you need to do is go into your dbml and set the Serialization Mode to 'Unidirectional' (see: http://www.codeexperiment.com/post/image.axd?picture=2008%2f10%2ffigure2.png )

Next, add the Clone class to your App_Code from her: http://naspinski.net/post/Cloning-an-Entity-in-Linq-to-Entities.aspx

Now it is simple:

using (DataContext db = new DataContext())
{
  DataElement ExistingItem = (from c in db.DataElements select c).FirstOrDefault();                         		
  DataElement NewItem = ExistingItem.Clone();
  //change whatever you want to change
  db.DataElements.InsertOnSubmit(NewItem);			
  db.SubmitChanges();
}
                                              
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