管理实体框架中的复杂类型？

Question

I have the following entity models. When I try to save a new User object that contains a new Account, it throws a DBUpdateException: An error occurred while saving entities that do not expose foreign key properties for their relationships.

Is it possible to provide mapping for the two objects without adding foreign keys to my model. I hate the idea of having foreign keys in my models. If there is no other solution, how would i resolve this issue using foreign keys?

public class User
{
   public virtual int Id { get; set; }
   public virtual Account Account { get; set; }
}

public class Account
{
   public virtual int Id { get; set; }
}

Answer 1

Are either of these classes really "complex types" or are they both entities with their own corresponding table?

If they're entities, you can indeed configure EF to not require foreign key properties in the classes themselves. In your DbContext class, override OnModelCreating and add some configuration code like this:

modelBuilder.Entity<User>().HasRequired(u => u.Account).WithRequiredPrincipal();

If I've gotten that right, that will configure a "required:required" relationship between User and Account without needing any foreign key properties on either class.

Answer 2

您必须从类Account删除属性Id ，否则实体框架会将类Account视为实体而不是复杂类型。