Linq query which has a non db object within - linq

Question

I have multiple View Model classes that get data from the database using Linq (DBContext classes have a similar structure but with more fields)
I am lacking knowledge to get data from one class object because that is contained within a wrapper class that does not have a corresponding db object.
Thank you in advance for any help or suggestions on this.
Here are the class structures:
public class TopLevelViewModel
{
public TopLevelID { get; set; }
public TopLevelTitle { get; set; }
public List<SecondLevelViewModel> SeconLevel { set; get; }
public TopLevelViewModel()
{
Inner = new List<SecondLevelViewModel>();
}
}
public class SecondLevelViewModel
{
public SecondLevelID { get; set; }
public SecondLevelTitle { get; set; }
public TopLevelID { get; set; }
public WrapperViewModel { get; set; }
}
public class InnerViewModel
{
public InnerID { get; set; }
public InnerTitle { get; set; }
public SecondLevelID { get; set; }
}
public class WrapperViewModel
{
public List<InnerViewModel> Inner { set; get; }
public WrapperViewModel()
{
Inner = new List<InnerViewModel>();
}
}
Linq query to get data for the above db objects:
List<TopLevelViewModel> data = null;
data = db.TopLevel.Where(t => t.TopLevelID == URLTopLevelID)
.Select(t => new TopLevelViewModel()
{
TopLevelID = t.TopLevelID,
TopLevelTitle = t.TopLevelTitle,
SeconLevel = db.SecondLevel.Where(s => s.TopLevelID == t.TopLevelID)
.Select(s => new SecondLevelViewModel()
{
SecondLevelID = s.SecondLevelID,
SeconLevelTitle = s.SeconLevelTitle,
WrapperViewModel = ???
}).ToList<SecondLevelViewModel>()
}).ToList < TopLevelViewModel();
Query to get Inner object data:
db.Inner.Where(i => i.SecondLevelID == s.SecondLevelID)
.Select(i => new InnerViewModel()
{
InnerID = i.InnerID,
InnerTitle = i.InnerTitle
}).ToList<InnerViewModel>()
Question: how do I incorporate the above inner query to be part of WrapperViewModel class and have that in the main Linq query as a single query?
WrapperViewModel does not have a DB object but it is kind of a wrapper class to InnerViewModel class.

Answer 1

I think I figured it out. Hope it will be useful to someone. If there are any ideas/suggestions please share!
The single query would be:
List<TopLevelViewModel> data = null ;
data = db.TopLevel.Where(t => t.TopLevelID == URLTopLevelID).Select(t => new TopLevelViewModel()
{
TopLevelID = t.TopLevelID,
TopLevelTitle = t.TopLevelTitle,
SeconLevel = db.SecondLevel.Where(s => s.TopLevelID == t.TopLevelID).Select(s => new SecondLevelViewModel()
{
SecondLevelID = s.SecondLevelID,
SeconLevelTitle = s.SeconLevelTitle,
WrapperViewModel = new WrapperViewModel { Inner =
db.Inner.Where(i => i.SecondLevelID == s.SecondLevelID).Select(i => new InnerViewModel()
{
InnerID = i.InnerID,
InnerTitle = i.InnerTitle
}).ToList<InnerViewModel>()
}).ToList<SecondLevelViewModel>()
}).ToList < TopLevelViewModel();