I have go the oddest problem, I get an object from EF and pass it back to the Business Logic for manipulation, when finished i’m trying to save the object back to the DB, when the object is passed into the following method it’s EntityState is Modified but as soon as the attach line of code is run it is set to UnChanged hence the Save will not work.
Does anyone know why EF would do this?
public void Save(IEntity entity)
{
using (var context = new eDocumentEntities())
{
using (var scope = new TransactionScope())
{
if (entity.Id != 0)
context.AttachTo(entity.EntitySet, entity);
else
context.AddObject(entity.EntitySet, entity);
context.SaveChanges();
scope.Complete();
}
}
}
Ok I found the solution to the problem here but Ii’m more interested in an explanation, why would EF do this, seems very counter productive!?
http://geekswithblogs.net/michelotti/archive/2009/11/27/attaching-modified-entities-in-ef-4.aspx