LINQ並加入精選

Question

我有以下SQL：

select  o.tekst as Enhet, 
        coalesce(f.Antall,0) as AntallF, 
        coalesce(f.snitt,0) as SnittF, 
        coalesce(b.antall,0) as AntallB 
        from tblhandlingsplan hp
    inner join tblorg o on hp.eierorgid = o.orgid
    left outer join (select f.handlingsplanid, count(t.tiltakid) as Antall, coalesce(avg(convert(float,t.status)),0) as Snitt from tblhandlingsplanforbedring f left outer join tblhandlingsplantiltak t on f.forbedringsid = t.forbedringsid group by f.handlingsplanid) f on hp.handlingsplanid = f.handlingsplanid
    left outer join (select b.handlingsplanid, count(b.bevaringsid) as Antall from     tblhandlingsplanbevaring b group by b.handlingsplanid) b on hp.handlingsplanid = b.handlingsplanid
where utsendingsid = 1

正是我想要的，它可以正常工作...現在，我正在嘗試將其轉換為LINQ ...

我已經走了這么遠

from h in TblHandlingsplans
join o in TblOrgs
    on h.EierOrgID equals o.OrgID
join f in TblHandlingsplanForbedrings
    on h.HandlingsplanID equals f.HandlingsplanID into f2
join b in TblHandlingsplanBevarings
    on h.HandlingsplanID equals b.HandlingsplanID into b2
where h.UtsendingsID == 1
select new {
    Enhet = o.Tekst,
    AntallF = f2.Count(),
    AntallB = b2.Count()
}

但是現在我被困住了。。。我一輩子都無法弄清楚如何將SQL解決方案的平均部分包括在內。

我正在考慮將整個內容推到SP中，然后再保留它...

Answer 1

var query1 = from a in DB.Table1
             select new
             {
                 Id = a.Id,
                 Average = a.B.Average()
             };

var query2 = from b in DB.Table2
             join c in query1 on b.Id equals c.Id
             select c;

只是徒手處理，所以它可能實際上不起作用，但是那是您要嘗試做的事情嗎？ 這將導致在使用query2時創建一個SQL查詢。