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我正在使用连接从多个表中获取数据，并且下面附有一个表图像，这会导致问题。该表跟踪测试的状态，我想要具有进程 id 11 的测试，但是作为其跟踪表的多行 reutrning，这导致在我看来重复一个记录三次，我试图在 bookingdid 上应用 groupby 并获取最大 trackid这是表的唯一标识，但我无法做到我的 linq 查询也在下面。任何帮助。

dc_tstatustrack 表

这是我的 linq 查询：

using (var db = new bc_limsEntities())
            {
                var result = (from d in db.dc_tpatient_bookingd
                              join m in db.dc_tpatient_bookingm on d.bookingid equals m.bookingid into a
                              from m in a.DefaultIfEmpty()
                              join p in db.dc_tpatient on m.prid equals p.prid into b
                              from p in b.DefaultIfEmpty()
                              join t in db.dc_tp_test on d.testid equals t.TestId into c
                              from t in c.DefaultIfEmpty()
                              //join mt in db.dc_tp_tmethod on t.TestId equals mt.testid into j
                              //from mt in j.DefaultIfEmpty()
                              // join gm in db.dc_tp_groupm on t.GroupId equals gm.GroupId into e
                              //from gm in e.DefaultIfEmpty()
                              join pn in db.dc_tpanel on m.panelid equals pn.panelid into f
                              from pn in f.DefaultIfEmpty()
                              join og in db.dc_tp_organization on m.clientid equals og.OrgId into g
                              from og in g.DefaultIfEmpty()
                              join w in db.dc_tp_ward on m.wardid equals w.wardid into h
                              from w in h.DefaultIfEmpty()
                              join tb in db.dc_tp_branch on m.BranchID equals tb.BranchID into i
                              from tb in i.DefaultIfEmpty()
                              join bd in db.dc_tp_refdoctors on m.doctorid equals bd.doctorid into k
                              from bd in k.DefaultIfEmpty()
                              join dt in db.dc_tstatustrack on d.bookingdid equals dt.bookingdid into l
                              from dt in l.DefaultIfEmpty()







                              where d.ProcessID == 5


                              && t.SubdepartmentId == subDepartmentID








                                  && fromDate <= m.enteredon && m.enteredon <= DateTime.Now

                                  && d.status != "H"

                                  && DateTime.Now > d.deliverytime

                                  && dt.processid == 11




                              select new { d, p, m, t, bd, pn, dt }).Distinct().ToList();

我做了这样的事情但对我不起作用：

group new { d, p, m, t, bd, pn, dt } by new { dt.bookingdid } into mno

任何帮助将不胜感激

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