LINQ JOIN + GROUP BY + SUM

Question

我有兩個LINQ語句，我想將它們合併爲一個，但對於我的生活，我無法實現它。我不能讓分組在第一個語句中工作。 它抱怨TotalBuy和TotalSell屬性不存在，雖然不抱怨AmountTC和AmountAUD。

這應該很簡單。有什麼想法嗎？

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))) 
}; 

作爲邊注，ItineraryItemRecords和TransactionRecords是由SubSonic處理類類別。

這真的應該很簡單，所以任何幫助，將不勝感激。

問候， 約翰

Answer 1

，稍有差錯，更正爲：

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))) 
    }; 

我建議不要使用重新標識 - 將有助於避免在未來這些錯誤。