Entity framework foreign key - entity-framework

Question

I have 2 classes
public class Person
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
}
and
public class PersonWebsite
{
public int Id { get; set; }
public string Website { get; set; }
public int PersonId{ get; set; }
}
I've seen stuff like this being done before
public class Person
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
public ICollection<PersonWebsite> PersonWebsites{ get; set; }
}
How could I go about implementing the code that when a Person is initialized, the PersonWebsites List will automatically be initialised and get all the PersonWebsite objects that have the same PersonId as the class that calls it.

Answer 1

Lazy Loading:
You can make PersonWebsites property virtual:
public virtual ICollection<PersonWebsite> PersonWebsites{ get; set; }
Entity framework will load it from the database as soon as it's required.
Also this method requires you to have lazy loading enabled which is by default:
DbContext.ContextOptions.LazyLoadingEnabled = true;
Eager Loading:
You can use include to force entity framework to load PersonWebsites on the first query:
DbSet.Include(p => p.PersonWebsites);

Answer 2

You may also want to change your PersonWebsite class like this, in order to navigate to the person from the PersonWebsite object (using Lazy-Loading):
public class PersonWebsite
{
public int Id { get; set; }
public string Website { get; set; }
[ForeignKey("Person")]
public int PersonId{ get; set; }
public virtual Person Person {get;set;}
}