IEnumerable和List

Question

这是示例实现之一，而不是原始代码..这个问题可能是旧问题但想了解基础知识..这里返回类型被指定为IEnumerable但实际上我们在这里返回一个List ..

因此，如果我们返回List，那么我们可以将方法返回类型也作为List .. rit？

select
    of.building_id as Building_Id,
    (
        select name from organization_building ob
        where ob.id = of.building_id
    ) as Building_Name,
    count(distinct of.id) as Floors_Total,
    count(distinct of.id) -
        count(distinct
            case when oe.end < ?start? and oe.start > ?end?
            then of.id else null end
        ) as Floors_Available
from
    organization_floor of
    left outer join
    organization_event oe
        on oe.calendar_id = of.calendar_id
group by
    of.building_id

这是WebAPI中的示例方法之一