对于程版的准考证打印，能不能加载打勾的树？怎么加载打勾的部分？

 什么意思？

 http://www.foxtable.com/help/topics/2503.htm

我要对已选中的学生进行遍历，怎么做？

Dim nms As String() = {"产品","客户","雇员"} \'指定生成目录树的各列
Dim qts As String() = {"\'","\'","\'"} \'指定将各列的值括起来的符号,这里都是字符型,所以都是单引号
Dim trv As WinForm.TreeView = e.Sender
Dim flt As String
Dim nd As WinForm.TreeNode
For Each nd In e.node.allNodes \'清除子节点的选中标记
    nd.Checked = False
Next
nd = e.Node.ParentNode
Do While nd IsNot Nothing \'清除父节点的选中标记
    nd.Checked = False
    nd = nd.ParentNode
Loop
For Each nd In trv.AllNodes
    If nd.Checked  Then
        Dim rts() As String = nd.FullPath.Split("\\")
        Dim val As String = ""
        For i As Integer = 0 To rts.length - 1
            If val > "" Then
                val = val & " And "
            End If
            val = val & nms(i) & " = " & qts(i) & rts(i) & qts(i)
        Next
        If flt > "" Then
            flt = flt & " Or (" & val & ")"
        Else
            flt = val
        End If
    End If
Next

For Each dr As DataRow In DataTables("订单").Select(flt)
    
Next