c# - sql server to linq group 通过有

Question

我正在学习linq。

我在 sql server 中有：

create table Something(id int, num int)

insert into Something(id, num) values(1, 10);
insert into Something(id, num) values(1, 10);
insert into Something(id, num) values(2, 7);
insert into Something(id, num) values(2, 7);
insert into Something(id, num) values(2, 7);
insert into Something(id, num) values(3, 5);
insert into Something(id, num) values(3, 5);
insert into Something(id, num) values(3, 5);
insert into Something(id, num) values(3, 5);
insert into Something(id, num) values(3, 5);
insert into Something(id, num) values(3, 5);
insert into Something(id, num) values(4, 5);

select id 
from something
group by id, num
having count(*) < num

结果是：4、2和1

我正在尝试使用 linq：

var query =
(from m in lst
group m by new { m.id, m.num } into g
where g.Count() < m.num).ToList();

我想将 g.Count() 与“num”字段进行比较，但我的代码有问题

感谢您的帮助！

Answer 1

尝试g.key.num代替m.num：

var query =
(from m in lst
group m by new { m.id, m.num } into g
where g.Count() < g.key.num).ToList();