如何在EF中区分

Question

我需要将此SQL转换为Linq以与Entity Framework一起使用：

SELECT TheDate, COUNT(DISTINCT IPAddress) as Count 
FROM TheTable Group By TheDate
Order By TheDate

困难是Count（Distinct IPAddress）。

格雷格

Answer 1

from x in db.TheTable
group x by x.TheDate into g
orderby g.Key
select new
{
    TheDate = g.Key,
    DistinctIPCount = g.Select(x => x.IPAddress).Distinct().Count()
}