Question

in may case i want use this Person class and it’s not nullable property called RelatedPerson in ef code first:

public class Person
{
    public virtual int Id { get; set; }
    // ... other properties

    [Required]
    public virtual Person RelatedPerson { get; set; }
}

now, how could i add mapping to define this relation and for first record as root of Pesron table the Id is one.

Answer 1

You cannot add a RequiredAttribute to a self-referencing property. It would not validate for the root entity which does not have a RelatedPerson.

You can enforce it to be required via business logic in Save and Update functions.