Question

I create few entities in Entity Framework. They are automatically added.

Question 1: Is it normal that MyEntity.CreateMyEntity automatically adds entity to the context?

Now, I want to save them but if they violate the database constraints I get exception, nothing is persisted — RIGHT, BUT — these objects remain in the ObjectContext which I do not want.

I tried to run that code as:

using (var t = new TransactionScope()) {
   ...create entities...
   try
   {
     context.SaveChanges();
     t.Complete();
     context.AcceptAllChanges();
   }
   catch
   {
      MessageBox.Show("Ooops");
   }
}

but even if I ran it in the transaction, these entities remain in the context.

Question 2: What am I missing? Do I have to remove them manually?

Answer 1

Another option to avoid unwanted objects without having to dispose the context is to manually detach them after you have committed the changes to the DB using Detach():

You can detach objects from an object
context when they are no longer
required. To do this, call the Detach
method. This reduces the amount of
memory used.

context.Detach(yourEntity);

Be careful with related entities though, if your entity has related objects the related entities will not be detached automatically.