Question

I have objects:
type A (Id, Name),
type B (AId, Description).

I want to make relation 1-to-1 (and create it 1-to-[0..1]). All works great exept deleting objects of type A. When I’m trying to delete some object from type A exception occurs.

A relationship is being added or deleted from an AssociationSet ‘…’. With cardinality constraints, a corresponding ‘…’ must also be added or deleted.

Im searched for solution (found editing CSDL for many-to-many), but nothing helps. There is also cascade action defined in the table in Database.

Any suggestions?

UPD: Thanks for answers.
Let’s say more clear.

1. I don’t want to implement inheretance betwen A and B

2. I try to fix problem by editing edmx file (like this http://codepolice.net/2008/12/16/cascade-delete-in-entity-framework/), but no luck. Seems it’s only worked for one-to-many.

3. I just want to have 2 objects with one-to-one relation. For example, Order and OrderDetails. I expected automatic creating/deleting OrderDetails for every Order I have.

Answer 1

One way to do this is to have a single entity that maps to 2 tables. See:

http://msdn.microsoft.com/en-us/library/bb896233.aspx