主题：不存在名称为""的datatable

下面这段代码仍然报错：

Dim cmd As New SQLCommand
Dim dt As DataTable
cmd.Connection Name = "erp"
cmd.CommandText = "select a.id_voucher,a.date_voucher,b.itemcode,b.num,c.classcode,d.classname from  ata00000 a,atb00000 b,aaa00000 c,aam00000 d where a.id_voucher=b.id_voucher and b.itemcode=c.code and c.classcode=d.classcode and a.date_voucher between '2011-05-01' and '2011-05-27' and a.warehousecode='0110'"

'上面的sql语句没问题，测试正常
dt = cmd.ExecuteReader()
Dim g As New CrossTableBuilder("统计表2",dt)
g.HGroups.AddDef("classcode","分类编码")
g.HGroups.AddDef("classname","分类名称")
g.VGroups.AddDef("date_voucher",DateGroupEnum.None)
g.Totals.AddDef("num")
g.HorizontalTotal = True
g.VerticalTotal = True
g.Build(True)
Tables("窗口1_Table1").DataSource = g.BuildDataSource()

 

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此主题相关图片如下：screenshot315.jpg