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List<TechnicalGuideModelObj> x = (from z in _list
join j in db.drawings
on z.NTK_No equals j.NTK_No into k
join i in db.photos
on z.NTK_No equals i.NTK_No into l
from j in k.DefaultIfEmpty()
from i in l.DefaultIfEmpty()
select new TechnicalGuideModelObj(z)
misoshu = rw.MiaoShu;
jierenwuid = rw.USER.Name;
farenwuid = rw.quest.USER.Name;
mokuai = rw.quest.MODE.MoKuai;