Question

So here is the original query

SELECT SUM(PickQty), SUM(ReqQty), AssignmentID, StopID FROM PickRequest GROUP BY AssignmentID, StopID

in LINQ

from a in dbReqs group a by new { a.AssignmentID, a.StopID } into pr select new { Assignment = pr.Key, StopID = pr.Select(s=> s.StopID), PickQty = pr.Sum(p=> p.PickedQty), Count = pr.Sum(c => c.ReqQty) } 

I must be doing something wrong because the LINQ version takes ages and the results seem a bit off. Ideas?

Answer 1

Try:

from a in dbReqs group a by new { a.AssignmentID, a.StopID } into pr select new {   AssignmentID = pr.Key.AssignmentID,   StopID = pr.Key.StopID,   PickQty = pr.Sum(p=> p.PickedQty),   Count = pr.Sum(c => c.ReqQty) } 

Note you can monitor what LINQ-to-SQL does quite easily:

ctx.Log = Console.Out; // or some other writer