Entity framework and inheritance: NotSupportedException

Question

I\'m getting

System.NotSupportedException: All objects in the EntitySet \'Entities.Message\' must have unique primary keys. However, an instance of

Answer 1

It sounds like you are pulling two records into memory one into message and one into comment.

Possible prblems:

• There are two physical messages with the same id
• The same message is being pulled up as a message and a comment
• The same message is being pulled up twice into the same context

That the problem sometimes goes away when you restart, points to a problem with cleaning up of context. Are you using "using" statements.

Do you have functionality for changing from a message to a comment?