c# - LINQ JOIN + GROUP BY + SUM

Question

我有两个 LINQ 语句，我想将它们合二为一，但我无法让它正常工作。

我无法在第一个语句中进行分组。 它提示 TotalBuy 和 TotalSell 属性不存在，但没有提示 AmountTC 和 AmountAUD .

这应该很简单。有什么想法吗？

var itineraryItems =
    from ii in this.ItineraryItemRecords
    join t in this.TransactionRecords on ii.OperatorID equals t.
    TransactionActor.OperatorID into g select new {
    OperatorID = ii.OperatorID, TotalBuy = g.Sum(i = >ii.TotalBuy)
        , TotalSell = g.Sum(i = >ii.TotalSell)
        , PaidTC = (0 - (g.Sum(t = >t.AmountTC)))
        , PaidAUD = (0 - (g.Sum(t = >t.AmountAUD)))
};

var itineraryItemz =
    from i in itineraryItems group i by i.OperatorID into g select new {
    OperatorID = g.Key, TotalBuy = g.Sum(i = >i.TotalBuy)
        , TotalSell = g.Sum(i = >i.TotalSell)
        , PaidTC = (0 - (g.Sum(i = >i.PaidTC)))
        , PaidAUD = (0 - (g.Sum(i = >i.PaidAUD)))
};

作为旁注，ItineraryItemRecords 和 TransactionRecords 是由 SubSonic 处理的类的集合。

这真的应该很简单，因此我们将不胜感激。

问候， 约翰

Answer 1

一个小错误，更正:

var itineraryItems = from ii in this.ItineraryItemRecords 
   join t in this.TransactionRecords on ii.OperatorID equals t.TransactionActor.OperatorID 
   into g 
   select new 
   { 
       OperatorID = ii.OperatorID 
       //, TotalBuy = g.Sum(i => ii.TotalBuy) 
       , TotalBuy = g.Sum(i => i.TotalBuy) 
       //, TotalSell = g.Sum(i => ii.TotalSell) 
       , TotalSell = g.Sum(i => i.TotalSell) 
       , PaidTC = (0 - (g.Sum(t => t.AmountTC))) 
       , PaidAUD = (0 - (g.Sum(t => t.AmountAUD))) 
   }; 

我建议不要重复使用标识符 - 将有助于避免将来出现这些错误。