Question

I am having trouble figuring out how to use .Include() to be able to access this nested relationship. I tried what seemed like the most direct way but intellisense doesn’t populate and when I hand enter the relation there is a compilation error.

I have this db mapped setup

public class W
{
 public int WId { get; set; }
 public virtual ICollection<T> Ts { get; set; }
}

public class T
{
 public int TId { get; set; }
 public int WId { get; set; }
 public int CId { get; set; }
 public virtual W W { get; set; }
 public virtual C { get; set; }
}

public class C
{
 public int CId { get; set; }
 public virtual ICollection<T> Ts { get; set; }
}

I have a get method which queries

//set in constructor
DbSet<W> dbSet;
DbContext context;

//called in method
IQueryable<W> query = dbSet;
query = query.Include(w => w.Ts);//works
query = query.Include(w => w.Ts.C); //I wanted to do this but it doesn't work

Can I use .Include() like this?

It seemed like it was going to work with no hitch but apparently I am doing it wrong. I would prefer not to have to iterate through the Ts collection and then populate their C manually each time.

Answer 1

You can use this syntax:

query = query.Include(w => w.Ts.Select(t => t.C));