Question

我有两个列表，其中包含1列货币和总计，如

    list1
      Currency  Total
      USD       10         
      EUR       25  

list2
      Currency  Total
      USD       10         
      EUR       25 
      INR       55

如何从基于货币基础的单个列表中的两个列表中获得总和，如此

ListSummary

      Currency Total
      USD       20
      EUR       50
      INR       55

以下Linq代码为我生成了2个列表

         var license_sum = licenses.GroupBy(x => x.Currency,
                        (key, values) => new {
                            Currency = key,
                            Total = values.Sum(x => x.FeesCustom == 0 ? x.FeesNormal : x.FeesCustom)
                        });
        var trans_sum = translations.GroupBy(x => x.Currency,
                        (key, values) => new {
                            Currency = key,
                            Total = values.Sum(x => x.FeesCustom == 0 ? x.FeesNormal : x.FeesCustom)
                        });

从这2个我正在计划overool_sum列表

Answer 1

var overool_sum = licenses.Concat(translations).GroupBy(x => x.Currency,
                        (key, values) => new {
                            Currency = key,
                            Total = values.Sum(x => x.FeesCustom == 0 ? x.FeesNormal : x.FeesCustom)
                        });

如果它们是相同的类型 - 否则只是.Select一个常见的类型： - ）

Answer 2

这应该适合你：

    class MyClass {
        public string Currency { get; set; }
        public decimal Total { get; set; }
    }

    void Main() {
        var list1 = new List<MyClass>(){
                new MyClass{ Currency = "USD" , Total = 10},
                new MyClass{ Currency = "EUR" , Total = 25},        
            };

        var list2 = new List<MyClass>(){
                new MyClass{ Currency = "USD" , Total = 10},
                new MyClass{ Currency = "EUR" , Total = 25},        
                new MyClass{ Currency = "INR" , Total = 55},        
            };

        var list3 = list1.Concat(list2);

        var list4 = list3.GroupBy(x => x.Currency).Select(y => new MyClass {
            Currency = y.Key,
            Total = y.Sum(z => z.Total)
        });
        Console.WriteLine(list4);

    }

Answer 3

您可以使用Concat linq扩展名来连接两个列表，然后使用GroupBy对当前列表进行分组..

var overool_sum = license_sum.Concat(trans_sum )
                          .GroupBy(x => x.Currency)
                          .Select(x=>  new 
                          {
                            Currency = x.Key,
                            Total = x.Sum(x => x.Total)
                          })
                          .ToList();

GroupBy的2个联盟列表

3 个答案: