LINQ中的where子句子查询

如何解决LINQ中的where子句子查询

我正在尝试将SQL语法转换为LINQ查询,而子查询却有问题。 我想选择一个表中的Id的最大日期时间作为另一个选择命令的子查询,但是我不知道下面的代码是对是错。 我在Sql中拥有的

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        }else
        {
           getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

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我在linq中尝试过的东西

select ap.*,aph.Lat as 'personLat',aph.Lng as 'personLng',l.cityId,l.Lat as 'LifecenterLat',l.lng as 'LifecenterLng',l.Id as 'LifeCenterId' 
from Applicant ap
inner join ApplicantAddressHistory aph on ap.Id = aph.ApplicantId 
inner join LifePlusCenter l on aph.CityId = l.CityId 
Where ap.FamilyRoleTypeId = '82e26080-fda6-4396-946c-40d0e267f1f3'  and aph.CreatedDate in (select max(CreatedDate) from ApplicantAddressHistory
where ApplicantAddressHistory.ApplicantId = ap.Id)
order by ap.NationalityCode

没有下面的代码行,我的linq可以正常工作。

        var innerJoinMultipleTables = from app in db.Applicant.Where(x => x.FamilyRoleTypeId == Guid.Parse("82e26080-fda6-4396-946c-40d0e267f1f3"))
                                          join aph in db.ApplicantAddressHistory on app.Id equals aph.ApplicantId         
                                          where aph.CreatedDate == db.ApplicantAddressHistory.Max(x => x.CreatedDate && x.Id=aph.Id)
                                          join l in db.LifePlusCenter on aph.CityId equals l.CityId
                                          let centerLat = l.Lat
                                          let centerLng = l.Lng
                                          orderby app.NationalityCode
                                          select new { app,aph.Lat,aph.Lng,l.CityId,l.Branch,centerLat,centerLng };

我需要在Linq中的以下代码中将其作为子查询

  where aph.CreatedDate == db.ApplicantAddressHistory.Max(x => x.CreatedDate && x.Id=aph.Id)

我终于尝试了此方法,它仍然有效,但是不知道它的正确方法吗?!

select max(CreatedDate) from ApplicantAddressHistory where ApplicantAddressHistory.ApplicantId = '9836CEC4-EDCB-492C-9899-DF4279210CD2'

解决方法

不知道它在Linq中如何工作,但是您可以按如下所示修改查询,以获取每个ApplicantId的CreatedDate的最新详细信息。

select ap.*,aph.Lat as 'personLat',aph.Lng as 'personLng',l.cityId,l.Lat as 'LifecenterLat',l.lng as 'LifecenterLng',l.Id as 'LifeCenterId' 
from Applicant ap
inner join 
    (select *
    from
    (select *,row_number() over(partition by ApplicantId order by CreatedDate desc) rw
    from ApplicantAddressHistory
    ) p
    where p.rw=1
    ) aph 
    on ap.Id = aph.ApplicantId 
inner join LifePlusCenter l 
    on aph.CityId = l.CityId 
Where ap.FamilyRoleTypeId = '82e26080-fda6-4396-946c-40d0e267f1f3'  
/*
and aph.CreatedDate in (
select max(CreatedDate) from ApplicantAddressHistory
where ApplicantAddressHistory.ApplicantId = ap.Id
)
*/
order by ap.NationalityCode
,

最后我来到了:

            var z = from app in db.Applicant
                    join aph in db.ApplicantAddressHistory on app.Id equals aph.ApplicantId
                    join l in db.LifePlusCenter on aph.CityId equals l.CityId

                    let createDate = app.ApplicantAddressHistory.Max(c => c.CreatedDate)

                    where createDate.HasValue && aph.CreatedDate == createDate

                    && app.FamilyRoleTypeId == Guid.Parse("82e26080-fda6-4396-946c-40d0e267f1f3")
                    let personLat = aph.Lat
                    let personLng = aph.Lng
                    let centerId = l.Id
                    let LifecenterLat = l.Lat
                    let LifecenterLng = l.Lng
                    orderby app.NationalityCode
                    select new { app,aph,l,app.Id,l.CityId,centerId,personLat,personLng,LifecenterLat,LifecenterLng };

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