EF Core 2.0.0 One to One-or-Zero with Fluent Api

问题

In Fluent Api at EF Core 2.0.0, there aren't any methods HasRequired and HasOptional, and i have tow Models, Person and Employee:

    public class Person
    {
        public int Id { get; set; }

        public int EmployeeId { get; set; }
        public virtual Employee Employee { get; set; } // Optional
    }

    public class Employee
    {
        public int Id { get; set; }

        public int PersonId { get; set; }
        public virtual Person Person {get; set; } // Required
    }

• Person May to have Employee: Optional
• Employee Should have Person: Required

How to apply these convetions in database.

回答1:

You could just specify int? as EmployeeId property type.

BTW, no need to make navigation properties virtual.

来源：https://stackoverflow.com/questions/48394969/ef-core-2-0-0-one-to-one-or-zero-with-fluent-api