Why is there no update equivalent to WillCascadeOnDelete?

Question

When you\'re setting up a one:many relationship in EF code-first, you can choose whether it should cascade on delete like so:

modelBuilder.Entity

        

Answer 1

Entity framework work with relationship through navigation properties, so ON UPDATE CASCADE allready switched on for all such relations.

Hmm and on the other hand i'm not sure that you can directly change primary key of entity from Entity Framework.