datagrid绑定list没有数据 表头不显示的解决方法

var list = pt_orderworkflow_dao.getorderworkflow(wfid, uid, 1);
         if (list == null)
         {
             list = new list<pt_orderworkflow>();
         }
         dgwaitlist.datasource = list;
         dgwaitlist.databind();

　　

可以直接这样比较优雅了

oadatacontext db = databasehelper.getdb();
var rs = (from a in db.pt_orderworkflow
          where a.wfid == wfid && a.contractnumber == cnumber 
          select a).tolist<pt_orderworkflow>();
return rs.count() > 0 ? rs : new list<pt_orderworkflow>();