c# - linq 组数据

Question

原始数据：

StrDateTime ServerName 
9/15/2012 3:01:19 PM 'srvr1'
9/15/2012 3:01:19 PM 'srvr2'
9/15/2012 3:01:19 PM 'srvr33'
9/15/2012 3:02:15 PM 'srvr1'
9/15/2012 3:02:15 PM 'srvr5'

我的代码（not work）：

(from data in dataInToday
group data by data.StrDateTime into grp
let srvrs = (from i in grp select i.ServerName).ToString()
select new
{ 
    grp.Key,
    srvrs
}).Take(20).Dump();

预期输出：

Key srvrs 
9/15/2012 3:01:19 PM 'srvr1, srvr2, srvr33'
9/15/2012 3:02:15 PM 'srvr1, srvr5'
9/15/2012 3:02:43 PM 'srvr1, srvr2'
9/15/2012 3:03:19 PM 'srvr9, srvr2'
9/15/2012 3:04:19 PM 'srvr5, srvr11'
9/15/2012 3:05:19 PM 'srvr1, srvr2'

是否有 linq 函数可以实现它

Answer 1

这行得通吗？

(from data in dataInToday
group data by data.StrDateTime into grp
let srvrs = string.Join(", ", (from i in grp select i.ServerName))
select new
    { 
       grp.Key,
       srvrs
    }).Take(20).Dump();