Linq to SQL LEFT JOIN, Sortieren und Gruppieren nach Graf

Question

Ich habe diese Abfrage perfekt funktioniert:

SELECT B.ID, B.NAME, COUNT(BU.ID) AS TOTAL 
FROM Building B 
LEFT JOIN BuildingUser BU ON BU.ID_BUILDING = B.ID  
GROUP BY B.ID, B.NAME 
ORDER BY COUNT(BU.ID) DESC, B.NAME 

aber ich bin nicht das erwartete Ergebnis bekommen, wenn ich es zu Linq zu konvertieren. Es gibt count = 1 zurück, wenn linker Join null zurückgibt. Also, ich habe diese Abfrage versucht, herauszufinden:

var list1 = (from building in db.GetTable<Building>() 
      join entitybuildinguser in db.GetTable<BuildingUser>() 
       on building.ID equals entitybuildinguser.ID_BUILDING into tmpbuildinguser 
       from buildinguser in tmpbuildinguser.DefaultIfEmpty()     
      group building by new 
      { 
       building.ID, 
       building.NAME 
      } into grpBuilding             
      orderby grpBuilding.Select(g => g.ID).Count() descending, grpBuilding.Key.NAME 
      select new 
      { 
       ID_BUILDING = grpBuilding.Key.ID, 
       NAME = grpBuilding.Key.NAME, 
       users = grpBuilding.Select(g => g.ID).Count() 
      }); 

Answer 1

Try this:

from b in db.Buildings 
join u in db.BuildingUsers on b.ID equals u.ID_BUILDING into g 
orderby g.Count() descending, b.Name descending 
select new 
{ 
    Id = b.ID, 
    Name = b.NAME, 
    Total = g.Count() 
}