等效的C＃LINQ代碼爲SQL

Question

CI是新來的LINQ，並有下面的SQL代碼，我想一個等價的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

使用查詢語法它看起來就像這樣：

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() 
      };