Linq GroupBy

 

 1                     //Linq
 2 
 3                     //var result = from p in personList
 4                     //             group p by p.Id
 5                     //    into grouped
 6                     //             select new { Id = grouped.Key, Count = grouped.Count() }
 7                     //    into temp
 8                     //             orderby temp.Count descending
 9                     //             select temp;
10 
11 
12 
13                     //Lambda
14 
15                     var result =
16                         personList.GroupBy(g => g.Id)
17                             .Select(s => new { Id = s.Key, Count = s.Count() })
18                             .OrderByDescending(o => o.Count);

 

posted @ 2018-04-01 14:36  热敷哥  阅读(216)  评论(0)  编辑  收藏  举报