Question

我有2个表，第一个表是交易

交易表：

 Id        LoanId
 1          100

我的第二个表是TransactionLeg表

transactionleg table：

ID  TransactionId GLAmount
1       1            200
2       1            200

我想在transactionId列中加入两个，按照loanID分组并将GLAmount加起来

所以它应该产生以下内容：

LoanId TotalGlAmount 100 400

var investmentsWritten = from transaction in ctx.Transactions
                         join transactionleg in ctx.TransLegs on transaction.Id equals transactionleg.TransactionId
                         where
                         transaction.Class == Transaction.TransactionClasses.WriteOff &&
                         transaction.Created >= StartDate.Date && transaction.Created <= EndDate.Date
                         group transaction by transaction.LoanId
                         into g
                         select new { Id = g.Key, Value = _____ };

我想知道下划线的位置是什么，值是transactionleg.GLAmount。我尝试了g.Sum（x =＆gt; x.GLAmount）但GLAmount无法识别，它以红色突出显示Cannot resolve symbol GLAmount

Answer 1

这是因为GLAmount位于transactionleg而不是transaction，像这样修改你的小组：

group new 
     { 
       transaction,
       transactionleg 
     } 
  by new
     {
       transaction.LoanId
     }

现在选择：

select new 
      { 
        Id = g.Key, 
        Value = g.Sum(x=>x.transactionleg.GLAmount) 
      }

Linq - 内联合与总和

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