Question

Here’s sample model classes, which being use with Entity Framework Code First:

public class Master
{
  public int Id { get; set; }
  public Collection<Detail> Details { get; set; }
}

public class Detail
{
  public int Id { get; set; }
  public Master Master { get; set; }
  public SubDetail SubDetail1 { get; set; }
  public SubDetail SubDetail2 { get; set; }
}

public class SubDetail
{
  public int Id { get; set; }
}

I want to load Master with all of its details and sub-details explicitly. To load details I’m using Include:

context.Masters.Include("Details").Where(master => master.Id == 1);

What should I use to load sub-details?

Answer 1

Try

context.Masters.Include(m => m.Details.Select(d => d.SubDetail1))
   .Include(m => m.Details.Select(d => d.SubDetail2))
   .Where(master => master.Id == 1);

Non generic version

context.Masters.Include("Details.SubDetail1")
   .Include("Details.SubDetail2")
   .Where(master => master.Id == 1);