How to avoid System.Data.Entity.Infrastructure.DbUpdateException

Question

I have this DbContext object which consists of -

- Employee
- CompanyAddress  (PK: AddressFirstLine, City)
Note: one Employee can have many CompanyAddress


        

Answer 1

Your error has got nothing to do with the DbContext objects. Your problem is that you are trying to insert a record with duplicating primary key. That is what your exception message says.

Look at how you create your CompanyAddress objects and what are the keys when you save them - this will give you the clues.

Edit: And it is a bad idea to have primary key to be a natural key, i.e. you should not assign city and address as primary keys. You should have either Guid or Integer to be primary key that is not dependent on the information stored in DB.

And to enforce uniqueness, before you save to DB, you check if that record exists, and can add a unique index to database table based on the unique constraints.