c# - 使用 LINQ 选择组中的字段

Question

如何在 LINQ 中选择属于 group by 的字段？

例如。：

var result =   from a in table
           where Date >= DataStart && Date <= DataStop
           group a by a.Field2 into b
           select new
               {
                   AA = b.Sum(x => x.Total),
                   BB = a.Field2
               };

Answer 1

由于您是分组依据Field2,Field2是组的关键，所以您可以使用b.Key

var result =   from a in table
               where a.Date >= DataStart && a.Date <= DataStop
               group a by a.Field2 into b
               select new
               {
                   AA = b.Sum(x => x.Total),
                   BB = b.Key
               };