SQL的等效C＃LINQ代码

Question

我是LINQ的新手，并具有以下SQL代码，我想要一个等效的C＃LINQ

SELECT
    COUNT(c.sId)
    ,a.Activity
FROM FillStat c
INNER JOIN Activity a
    ON a.Id = c.ActivityID
WHERE c.pId= 300
GROUP BY a.Activity

Answer 1

使用查询语法，它将看起来像这样：

var result = from c in db.FillStat
             join a in db.Activity on c.ActivityID equals a.Id
             where c.pId = 300
             group 1 by a.Activity into g
             select new {
                 Activity = g.Key,
                 Count = g.Count()
             };