如何使用linq将正确的字段归为一组并求和？

Question

我在此结构中有一个对象列表（债务人）

 public class DebtorDto 
    {
        public string OutstandingBalance { get; set; }
        public string Name { get; set; }
        public string Company { get; set; }
        public string InvoiceNumber { get; set; }
    }

看起来像

OUTSTANDINGBALANCE  NAME    COMPANY  INVOICENUMBER
1500                Debtor1 comp1    1235      
1600                Debtor1 comp3    1236      
150                 Debtor2 comp1    1234      
1700                Debtor2 comp4    1237      
15000               Debtor1 comp1    1238      
150                 Debtor1 comp3    1239      
500                 Debtor4 comp1    1274      
1500                Debtor3 comp3    1634      
500                 Debtor3 comp1    1334      

我想做的是列出每个债务人的欠款总额

例如（请注意，下面的总额并不准确，我刚刚将它们补足了，但需要将上述总额加起来）

Debtor1  31050
Debtor2  3050
Debtor3  1050
Debtor4  41050

我到目前为止所拥有的是

var query = from e in _allDebtors.GroupBy(x => x.Company)
                .Select(y => y.Sum(z => decimal.Parse(z.OutstandingBalance))))))

这实际上给了我正确的金额，如下所示，但我也不知道该如何获得债务人的名字？

31050
3050
1050
41050

Answer 1

您需要在Select更改返回值：

var query = _allDebtors.GroupBy(x => x.Company)
            .Select(y => new { Company=y.Key, Total=y.Sum(z => decimal.Parse(z.OutstandingBalance)) });

请注意，这是由公司提供的 -如果您希望由债务人提供，则为：

var query = _allDebtors.GroupBy(x => x.Name)
            .Select(y => new { Name=y.Key, Total=y.Sum(z => decimal.Parse(z.OutstandingBalance)) });

Answer 2

var query = from e in _allDebtors.GroupBy(x => x.Company)
                                 .Select(y => new {
                                              Name = y.Key,
                                              Sum = y.Sum(z => decimal.Parse(z.OutstandingBalance))
                                  });

Answer 3

 var query = from e in _allDebtors.GroupBy(x => x.Company)
            .Select(y => new {Name = y.Key, TotalAmount = y
                                                 .Sum(z => 
                                                  decimal.Parse(z.OutstandingBalance))});