Linq in

  OrderNum = (from s in g
                                     from f in dt.JXDW_ITIL_WORK_ORDER
                                     where s.CALL_ID == f.CALL_ID && (new string[] { "待回访", "回访中", "关闭" }).Contains(f.ORDER_STATUS)
                                     select f).Count(),
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原文地址：https://www.cnblogs.com/liuxinls/p/3030540.html