Entity Framework data cloning

Question

Entity Framework data cloning

entity-framework

Question

I am creating software where user can create new product based on older product.

Now I need to make copying / cloning operations with Entity Framework. First I started writing like this:

foreach(sourcedata1 in table1)
{
   ... create new table
   ... copy data
   ... create Guid
   ... add
   foreach(sourcedata2 in table2)
   {
       ... create new table
       ... copy data
       ... create Guid
       ... add       

       ... and so on
   }
}

Problem is that this not a nice way to do it. Is there any easy way clone information (except Guid that needs to be generated for new rows) or should I manually copy everything?

Other solution

You could also use EmitMapper or AutoMapper to do copying of the properties.

Tx3

Popular Answer

To clone an Entity in Entity Framework you could simply Detach the entity from the DataContext and then re-add it to the EntityCollection.

context.Detach(entity);
entityCollection.Add(entity);

Update for EF6+ (from comments)

context.Entry(entity).State = EntityState.Detached;
entity.id = 0;
entity.property = value;
context.Entry(entity).State = EntityState.Added;
context.SaveChanges();

ChrisNel52