如何获取计数列排序的组

Question

用简单的英语很难问这个问题,所以我会展示我想要做的事情.

这是我的SQL代码:

select top 100 [Name], COUNT([Name]) as total from ActivityLog  
where [Timestamp] between '2010-10-28' and '2010-10-29 17:00'  
group by [Name]  
order by total desc  

我需要在LinQ中写一下.到目前为止,我有以下内容:

var groups = from ActivityLog log in ctx.ActivityLog
 where log.Timestamp > dateFrom
 where log.Timestamp <= dateTo
 group log by log.Name;

但我没有COUNT(*)列来排序:(

Answer 1

我担心我对fluent语法(与查询语法相反)更为舒服,但这里有一个可能的LINQ答案:

 ctx.ActivityLog
   .Where(x => x.TimeStamp > dateFrom && x.TimeStamp <= dateTo)
  .GroupBy(x => x.Name)
  .Select(x => new { Name = x.Key, Total = x.Count() })
  .OrderByDescending(x => x.Total)
  .Take(100)

编辑:

好吧,我走出了我的舒适区,想出了一个查询语法版本,只是不要期望太多.我警告过你我上面的能力:

(from y in (
    from x in (
        from log in ActivityLog
        where log.Timestamp > dateFrom
        where log.Timestamp <= dateTo
        group log by log.Name)
    select new { Name = x.Key, Total = x.Count() })
orderby y.Total descending
select new { Name = y.Name, Total = y.Total }).Take(100)