主题：求助 多选目录树

老师:

您好!

多选 目录树

在没勾选时就不显示数据,请问在那里加代码及代码怎样写?

谢谢!!!

Dim trv As WinForm.TreeView = e.Sender
Dim flt As String
For Each nd As WinForm.TreeNode In e.node.Nodes '清除子节点选中状态
    nd.Checked = False
Next
If e.node.ParentNode IsNot Nothing Then '去掉父节点选中状态
    e.node.ParentNode.Checked = False
End If
For Each nd As WinForm.TreeNode In trv.AllNodes
      If nd.Checked Then
        If flt > "" Then
            flt = flt & " Or "  '注意用or而不是And
        End If
        If nd.Level = 0 Then '注意下面的条件都要用括号括起来
            flt = flt & "( 产品 = '" & nd.Text & "')"
        Else
            flt = flt & "( 产品 = '" & nd.ParentNode.Text & "' And 客户 = '" & nd.Text & "')"
        End If
    End If   
Next
Tables("订单").Filter = flt