查询要使用分组依据

本文介绍了查询要使用分组依据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

var results = (from c in db.RATEPROCESSes
                                  join b in db.BATCHes on c.BATCHKEY equals b.id
                                  where c.MANIFESTDATE >= DateTime.Parse(fdate) && c.MANIFESTDATE <= DateTime.Parse(sdate) && c.ACCOUNTNBR == accountno
                                  select new { Pieces = b.pieces, ACCOUNTNBR = c.ACCOUNTNBR, Manifestdate = c.MANIFESTDATE, BATCHKEY = c.BATCHKEY }).Select(x => new Batch_RateProcess { ACCOUNTNBR = x.ACCOUNTNBR, Pieces = x.Pieces, Manifestdate = DateTime.Parse(x.Manifestdate.ToString()), BATCHKEY = x.BATCHKEY.ToString()});

我想使用accountnbr分组吗????

i want to use group by accountnbr how can i do it????

推荐答案

var preResults = (from c in db.RATEPROCESSes
                                  join b in db.BATCHes on c.BATCHKEY equals b.id
                                  where c.MANIFESTDATE >= DateTime.Parse(fdate) && c.MANIFESTDATE <= DateTime.Parse(sdate) && c.ACCOUNTNBR == accountno
                                  select new { Pieces = b.pieces, ACCOUNTNBR = c.ACCOUNTNBR, Manifestdate = c.MANIFESTDATE, BATCHKEY = c.BATCHKEY })

var results=preresults.Select(x => new Batch_RateProcess { ACCOUNTNBR = x.ACCOUNTNBR,
     Pieces = x.Pieces, Manifestdate = DateTime.Parse(x.Manifestdate.ToString()),
     BATCHKEY = x.BATCHKEY.ToString()})
           .GroupBy(rateProcess=>rateProcess.ACCOUNTNBR);

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