linq按2个条件计算

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

我无法弄明白如何按2组计算

我只有一组

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

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

有什么想法吗？

Answer 1

在Age

中添加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()
                            };