Unidirectional One-To-One relationship in Entity Framework

Question

Below example of one-to-one relationship throws an exception

public class User
{
    public int Id { get; set; }
    public Address Address { get; set; }
}

         


        

Answer 1

You need to use fluent API to map the relationship as shared primary key.

public class MyContext : DbContext
{
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
         modelBuilder.Entity
()
             .HasRequired(a => a.User)
             .WithOptional(u => u.Address);
    }
}