Entity Framework Core will create a one-to-one relationship when both entities involved in the relationship contain a navigation property to the other, and the dependent entity includes a foreign key property for the principal entity. The following example illustrates a one-to-one relationship between Author and AuthorBiography:
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public class Author
{
public int AuthorId { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public AuthorBiography Biography { get; set; }
}
public class AuthorBiography
{
public int AuthorBiographyId { get; set; }
public string Biography { get; set; }
public DateTime DateOfBirth { get; set; }
public string PlaceOfBirth { get; set; }
public string Nationality { get; set; }
public int AuthorId { get; set; }
public Author Author { get; set; }
}
EF Core will generate a unique index on the AuthorId foreign key column in the AuthorBiographies table to ensure that only one biography can be associated with any particular author.
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