linq - 如何在 EF 中按不同进行分组

Question

我需要将此 SQL 转换为 Linq 以与实体框架一起使用：

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

困难在于计数（不同的 IP 地址）。

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()
}