Question

So I have classes that looks like this.

public class User {
    public virtual IList<Member> Members {get;set;}
}

public class Member {
    public virtual AnotherTable Another {get;set;}
}

public class AnotherTable {
    public string Name {get;set;}
}

When I perform the query directly against the DataContext the Include works, but when I do an AsQueryable() on the IList of members the include doesn’t work.

Is there a way to have Include/Eager functionality on lazy loaded properties, such as the Members property above, or do I always have to go through the DataContext to get that feature?

User.Members.AsQueryable().Include(a => a.Another).ToList() // <-- nada, no way Jose
_db.Members.Include(m => m.Another).ToList() // <-- all good in the neighborhood

I ask cause it can be a huge difference of 1 sql query vs. 100 queries for something result equivalent.

Thanks in advance.

Answer 1

AsQueryable doesn’t make it linq-to-entities query. It is still Linq-to-object query on top of List. List doesn’t know how to handle Include – only DbQuery knows it so you must get DbQuery:

var entry = context.Entry(user);
entry.Collection(u => u.Member).Query().Include(m => m.Another).Load();