主题：BOM目录树问题，狐爸请看

查询按钮的代码设置为：

Dim nm As String = e.Form.Controls("ComboBox1").value
If nm = "" Then
    Return
End If
Dim dr As DataRow  = DataTables("表A").Find("标题 = '" & nm  & "'")
If dr Is Nothing Then
    Return
End If
Dim ry As String = dr("键")
Dim kys As String = "'" & ry & "'"
For Each dr1 As DataRow In DataTables("表A").DataRows
    Dim dr2 As DataRow = dr1
    Do
        dr2 = DataTables("表A").Find("键 = '" & dr2("父键")  & "'")
        If dr2 Is Nothing  Then
            Exit Do
        ElseIf dr2("键") = ry Then
            kys = kys & ",'" & dr1("键") & "'"
            Exit Do
        End If
    Loop
Next
Tables("表A").filter = "键 in (" & kys & ")"

也可以配合原来例子中的目录树来实现：打开目录树窗口，在命令窗口执行下面代码看看：

Dim tr As WinForm.TreeView = Forms("窗口1").Controls("TreeView1")
Dim nd0 As WinForm.TreeNode = tr.SelectedNode
Dim s As String = nd0.text
Dim x As String
For Each nd As WinForm.TreeNode In tr.AllNodes
    For i As Integer = 0 To tr.nodes.count-1
        If nd.fullpath.contains(s)
            x = x & ",'" & nd.text & "'"
            Exit For
        End If
    Next
Next

x = x.trim(",")
Tables("表A").Filter = "标题 in (" & x & ") "

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点击浏览该文件:bom.zip

你的编程太好了，我只是照着你的思路改的，为什么就不能实现呢？把例子传给你再帮我看看吧，窗口中，“表展开”的按钮实现的结果不对，应该是和“目录树展开”的相对应，表展开筛选出来的行太少了。万分感谢！

真是保姆式服务呀。