Doubt with EntityFramework CodeFirst

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Doubt with EntityFramework CodeFirst

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#1 by (9 votes)

5

I'm starting in the Entity Framework and am having a question regarding CodeFirst . Why do I have to use as virtual some properties like the example below?

[Table("Grupo")]
public class Grupo
{
   public int ID { get; set; }
   [Required(ErrorMessage="Nome não pode ser branco.")]
   public string Nome { get; set; }

   public virtual IQueryable<Produto> Produtos { get; set;}
}

c# entity-framework-6

asked by anonymous 11.08.2015 / 23:25

1 answer

What are packages? How do I join a list in Python?

score 9 · Accepted Answer

For two reasons:

Why is the Entity Framework that mounts this object for you;

Because it is not necessarily a list or a collection. It can be a Dynamic Proxy, which does the Framework lazy loading procedure. I explain this here #

This is incorrect:

public virtual IQueryable<Produto> Produtos { get; set; }

IQueryable<> is an object who can evaluate a list, not a list in fact. This is explained in more detail here .

The correct one is:

public virtual ICollection<Produto> Produtos { get; set; }