Question

所以这是原始查询

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

LINQ中的

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)
}

我必须做错事，因为LINQ版本需要很长时间，而且结果似乎有些偏差。想法？

Answer 1

尝试：

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)
}

请注意，您可以非常轻松地监视LINQ-to-SQL的功能：

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

SQL到L2S翻译帮助

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