Question

    var Query2 = from x in CoreDatabase.Set<tblPerson>()
                 .Include(a => a.tblApplicationInterface.Select(b => b.tblApplicationName)
                 .Where(c => c.AppplicationName == "MshHumanResources"))

                 select x;

I get The Include path expression must refer to a navigation property defined on the type. Use dotted paths for reference navigation properties and the Select operator for collection navigation properties.

I am simply trying to write

Here something that works:

Select * 
From tblPerson a INNER JOIN tblApplicationInterface b 
on a.id = b.id
INNER Join tblApplicationName c
ON b.fkid=c.id
Where b.ApplicationName like 'MshHumanResources'

Answer 1

That’s not how Include works. You want to use join instead:

var Query2 = from a in CoreDatabase.Set<tblPerson>()
             join b in CoreDatabase.Set<tblApplicationInterface>() on a.id equlas b.id
             join c in CoreDatabase.Set<tblApplicationName>() on b.fkid equals c.id
             where c.AppplicationName == "MshHumanResources"
             select a;

This is just selecting the columns from A – if you want to select columns from the other tables either create a class to combine the fields you need or use an anonymous type.