I have LegalBody at the top of a hierarchy (or bottom depending on how you look at it). One of its fields DefaultAddressID is a nullable FK to Address.

I want simple to set that field to null for all entities in the hierarchy so that I can clear the Address table (Clearing the LegalBody table first is not an option)

All the LegalBodyEntity ctors are internal so I can't use UpdateEntityDirectly. What other method can I use?

Cheers Simon

Well this works but there must be a better way!

                var ctor = typeof(LegalBodyEntity).GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, CallingConventions.Standard, new Type[0], null);
                var allLegalBodies = (LegalBodyEntity) ctor.Invoke(null);
                allLegalBodies.DefaultAddressID = null;
                adapter.UpdateEntitiesDirectly(allLegalBodies, null);

The ctor is internal because you marked it as abstract. You can create an instance through the factory though. var legalBodiesEntity = new LegalBodyFactory().Create();

etc.

OK, but why are these type-specific factories returning interfaces rather than properly typed objects?

For polymorphism I suppose.