linq分組匯總

linq進行list分組匯總

 var yield_day = (from item in yield
                                 group item by new
                               {
                                   item.DEFECTITEM,
                                   item.CDAY
                               }
                           into g
                               select new
                               {
                                   cday = g.Key.CDAY,
                                   item = g.Key.DEFECTITEM,
                                   cnt = g.Count()
                               }).OrderBy(g => g.cday).ThenBy(g => g.item).ToList();