c# - 2 个条件的 linq 计数

Question

我有一张这样的桌子。

Age Group

20  G1
21  G2
20  G2
21  G1
22  G3
21  G1
20  G2
21  G2
22  G3
20  G1
22  G3

我想要的结果是

Age Grp Count

20  G1 2 
20  G2 2
21  G1 2
22  G2 2
22  G3 3

我不知道如何按 2 组计算

我只有 1 组

   var thirdResultQuery=from row in secondResultQuery
                         group row by new {row.Grp  } into g
                         select new
                         {

                             g.Key.Grp,
                             ageCount = g.Count()
                         };

任何的想法？

Answer 1

加入Age_GROUP

var thirdResultQuery    =   from row in secondResultQuery
                            group row by new {row.Grp, row.Age} into g
                            select new
                            {
                                g.Key.Age,
                                g.Key.Grp,
                                ageCount = g.Count()
                            };