实体类未从正确的基类继承

Question

I am using EF 6.0 in my application. My problem is simple but it still had me scratching my head.I am creating partial classes corresponding to the entity classes to implement some custom properties there in.

Since i am using EF 6, i am inheriting my implementation of the partial class from System.Data.Entity.Core.Objects.DataClasses.EntityObject But when i update the model from the DB, the auto generated designer file has all the partial entity classes inheriting from System.Data.Objects.DataClasses.EntityObject . This is throwing compile time error "Partial declarations of 'EMS.DAL.Category' must not specify different base classes". 'Category' being the partial entity class.

Any pointers please about whats wrong, missing references or what?

Answer 1

If you are using EF6 you need to use EF6 tooling. It is included in VS2013 but there is also a version EF6 tooling available for download for VS2012. If you use old tooling with EF6 you will end up having some intricate and hard to resolve issues because of changes to EF6 runtime. Here is a blog post I wrote on this topic.