我的后台数据库是ACCESS
窗口的AfterLoad事件代码：
Dim cmd As New SQL Command
Dim dt As DataTable
cmd.CommandText = "SELECT DISTINCT Year(报价日期) As 年, Month(报价日期) As 月, 客户 F rom {报价主表}"
dt = cmd.ExecuteReader()
Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
trv.BuildTree(dt, "年|月|客户")
目录树的NodeMouseDoubleClick事件代码
Dim dr As DataRow = e.Node.DataRow '获取生成此节点的行
Dim Filter As String
Dim Year As Integer = dr("年")
Dim Month As Integer = dr("月")
Dim Product As String = dr("客户")
Select C ase e.N ode.Level
Case 0
Filter ="Year(日期) = " & Year
Case 1
Filter ="Year(日期) = " & Year & " And Month(报价日期) = " & Month
Case 2
Filter ="Year(日期) = " & Year & " And Month(报价日期) = " & Month & " And 客户 = '" & Product & "'"
End Select
DataTables("报价主表").LoadFilter = Filter
DataTables("报价主表").Load()
这是我照抄的，为什么不行？是不是ACCESS数据库的写法不是这样？
提示：（Microsoft Jet 数据库引擎找不到输入表或查询 '~TMPCLP报价主表'。 确定它是否存在，以及它的名称的拼写是否正确。）
错误所在事件：窗口,主窗口,AfterLoad
详细错误信息：
Object reference not set to an instance of an object.
请老师指点
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Post By：2019/7/2 20:21:00 [只看该作者]
