c# - 如何在 linq 或 lambda 表达式中使用 having、group by 和 distinct

Question

我需要将以下查询转换为linq 或lambda 表达式

 SELECT count(Hid.HouseholdID) FROM
 (SELECT HouseholdID FROM tblTmpJoinAll 
 WHERE loyal = 1 Group By HouseholdId 
 HAVING Count(distinct BasketID)>1) as Hid;

到目前为止，我已经尝试过了

lst.Where(f => f.Flybuys == true)
.GroupBy(h=>h.HouseholdID)
//.Where(x=>x.)// don't know what to right here
.Select(h => h.Key).Count();

Answer 1

我认为这段代码有效。

lst.Where(f => f.Flybuys) // you don't need == true here
   .GroupBy(f => f.HouseholdID)
   .Where(f => f.GroupBy(i => i.BasketID).Count() > 1)
   .Count();