C# 需要帮助Linq查询组由+;计数
我有下表和ActivityLog的记录:C# 需要帮助Linq查询组由+;计数,c#,linq,C#,Linq,我有下表和ActivityLog的记录: ID, UserId, Category, Created 1 11 DeAssigned 05/10/2012 2 11 LogIn 05/11/2012 3 20 Assigned 06/15/2012 4 11 Assigned 06/10/2012 5 20 DeAssigned 06/
ID, UserId, Category, Created
1 11 DeAssigned 05/10/2012
2 11 LogIn 05/11/2012
3 20 Assigned 06/15/2012
4 11 Assigned 06/10/2012
5 20 DeAssigned 06/13/2012
6 20 Assigned 07/12/2012
7 11 DeAssigned 07/16/2012
8 20 Assigned 08/15/2012
...
现在我想查询表以创建相同的结构和相同的结果,如下所示:
我所取得的成就:
var result = (from l in repoA.GetAll()
where l.Created >= System.DateTime.Now.AddYears(-1)
group l by new { l.Created.Value.Month, l.Category }
into groups
orderby groups.Key.Month
select new
{
Month = groups.Key.Month,
Category = groups.Key.Category,
Count = groups.Count()
});
没有最佳结果,但按月统计分组的所有活动:
[0] {Month = 6, Category = Assigned, Count = 2}
[0] {Month = 6, Category = Designed, Count = 1}
[0] {Month = 6, Category = LogIn, Count = 1}
[0] {Month = 7, Category = Assigned, Count = 3}
如何查询表格以将结果格式化为“水平计数”格式?或更简单:
var result = (from l in repoA.GetAll()
where l.Created >= System.DateTime.Now.AddYears(-1)
group l by l.Created.Month into groups
orderby groups.Key ascending
select new
{
Month = groups.Key,
Assigned = groups.Where(g => g.Category == "Assigned").Count(),
Deassigned = groups.Where(g => g.Category == "DeAssigned").Count(),
LogIn = groups.Where(g => g.Category == "LogIn").Count()
});
var result = (from l in repoA.GetAll()
where l.Created >= System.DateTime.Now.AddYears(-1)
group l by l.Created.Month into groups
orderby groups.Key ascending
select new
{
Month = groups.Key,
Assigned = groups.Where(g => g.Category == "Assigned").Count(),
Deassigned = groups.Where(g => g.Category == "DeAssigned").Count(),
LogIn = groups.Where(g => g.Category == "LogIn").Count()
});