Question

我想在Linq to EF查询中使用Average函数和Count。因此，如果我必须用t-sql中的代码部分解释我尝试实现的内容以便更清楚地理解，您可以看看下面的内容，

select s.SalesPointId, count(*) as ipp
from ScoreItem si
       inner join Score s on s.Id = si.ScoreId
where si.ResearchGroupType = 0 and si.IsValidForSalesPoint = 1
group by s.SalesPointId
select avg(ipp)
from (
select s.SalesPointId, count(*) as ipp
from ScoreItem si
       inner join Score s on s.Id = si.ScoreId

where si.ResearchGroupType = 0 and si.IsValidForSalesPoint = 1
group by s.SalesPointId
)

因此，我在Linq查询中编写了以下代码，

List<CvmNameAndValue> AnatolianSalesHeadshipIPPScore = (from si in db.ScoreItem
     join s in db.Score on si.ScoreId equals s.Id
     join sp in db.SalesPoint on s.SalesPointId equals sp.Id
     where (si.ResearchGroupType == ResearchGroupType.ScoreCard && si.IsValidForSalesPoint && sp.CompanyId == ContextData.User.CompanyId && s.ProjectPeriodId == ProjectPeriodId && spIds.Contains(sp.Id))
group s by s.SalesPointId into g
select new CvmNameAndValue
{
Name = SystemSetting.Label_AnatolianSalesHeadshipIPPScore,
Value = g.Average(x => db.Score.Count()).ToString()
})
.ToList();

retVal.Data.DataGroup = AnatolianSalesHeadshipIPPScore.ToList();

return retVal;

但是，不幸的是他们没有给我相同的结果，所以如果你对我的逻辑错误有任何建议，请感到自由并与我分享，

Answer 1

最后我已经解决了我的问题，所以如果你需要这样的东西，它可以解决你的问题，

double AnatolianSalesHeadshipIPPScore = 0;

AnatolianSalesHeadshipIPPScore = (from si in db.ScoreItem
                        join s in db.Score on si.ScoreId equals s.Id
                        join sp in db.SalesPoint on s.SalesPointId equals sp.Id
where (si.ResearchGroupType == ResearchGroupType.ScoreCard && si.IsValidForSalesPoint && sp.CompanyId == ContextData.User.CompanyId && s.ProjectPeriodId == ProjectPeriodId)
                    group si by s.SalesPointId into g
                    select new
                    {
                    sid = g.Key,
                    count = g.Count()
}).Average(m => m.count);

如何在Linq到EF中使用Count函数的平均函数使用

1 个答案: