Question

If I have the following class model …

public class A
{
    public int AId { get; set; }
    public ICollection<B> BCollection { get; set; }
}

public class B
{
    public int BId { get; set; }
    public ICollection<C> CCollection { get; set; }
}

public class C
{
    public int CId { get; set; }
}

… is it possible to eager-load an object of type A from the database with all cascading collections included?

I can include the BCollection like so:

A a = context.ASet.Where(x => x.AId == 1)
          .Include(x => x.BCollection)
          .FirstOrDefault();

Can I also include somehow the CCollection of all loaded B objects so that I get A with all dependent objects in memory with a single database query?

Answer 1

Use .Include(x => x.BCollection.Select(b => b.CCollection)) also described here.

It works also for cascade. Every time you need to eager load navigation property which is collection use .Select.