Question

这是转换为LINQ to SQL（Lambda please）

的语句

SELECT [Date]，SUM（count）[Counted]， SUM（时间）[时间] FROM dbo.TableName GROUP BY [日期]

这是没有group by和sum的原始数据

Date                    Counted Time
2011-09-07 00:00:00.000 34      31
2011-09-07 00:00:00.000 6       3
2011-09-07 00:00:00.000 7       3
2011-09-07 00:00:00.000 6       2
2011-09-07 00:00:00.000 7       2
2011-09-07 00:00:00.000 19      4
2011-09-07 00:00:00.000 13      4
2011-09-07 00:00:00.000 11      4
2011-09-07 00:00:00.000 14      3
2011-09-07 00:00:00.000 0.75    3

这些是分组依据和总和后的结果

Date                    Counted Time
2011-09-07 00:00:00.000 117.75  59

这就是我到目前为止所做的事情，但是当我做这个小组和总结时我很困惑。很显然，我的语法已经过时了。

var q = context.TableName.Where(...)
               .GroupBy(x => new { x.Date})
               .Sum(x => x.Counted, x.Time????)
               .Select(x => x.Date, x.Counted, x.Time;

Answer 1

var q = context.TableName
           .GroupBy(x => x.Date)
           .Select(g => new { 
               Date = g.Key,
               Counted = g.Sum(x => x.Counted), 
               Time = g.Sum(x => x.Time)
           });

Answer 2

使用Sum（）扩展方法怎么样：

var query = table.AsEnumerable().Select(s => s.Field<int>("counted")).Sum();

帮助将SQL语句转换为LINQ Lambda（需要group by和sum的帮助）

2 个答案: