老师好！

获取的4组数据，如果我只想生成3层目录树。根节点命名为是s（0），第2层命名为是s（1），第3层命名为是s（2）&  "（" &  s（3） &  "）" 。

如图所示，应该怎样修改？

谢谢！

此主题相关图片如下：360截图20190422120402890.jpg
 

DataFormat事件：

\'\'\'
Dim ary() As String = e.Text.split("；")
Dim trv As WinForm.TreeView = e.Form.controls("Treeview1")
If trv Is Nothing Then Return
trv.nodes.clear
For Each str As String In ary
    Dim s() As String = str.split("，")
    If s.length <> 4 Then Continue For
    Dim n1 As WinForm.TreeNode = Nothing
    Dim n2 As WinForm.TreeNode = Nothing
    Dim n3 As WinForm.TreeNode = Nothing
    Dim n4 As WinForm.TreeNode = Nothing
    For Each nd1 As WinForm.TreeNode In trv.Nodes
        If nd1.name = s(0).trim Then
            n1 = nd1
            For Each nd2 As WinForm.TreeNode In nd1.Nodes
                If nd2.name = s(1).trim Then
                    n2 = nd2
                    For Each nd3 As WinForm.TreeNode In nd2.Nodes
                        If nd3.name = s(2).trim Then
                            n3 = nd3
                            For Each nd4 As WinForm.TreeNode In nd3.Nodes
                                If nd4.name = s(3).trim Then
                                    n4 = nd4
                                End If
                            Next
                           
                        End If
                    Next
                End If
            Next
        End If
    Next
    If n1 Is Nothing Then
        n1 = trv.nodes.Add(s(0).trim)
    End If
    If n2 Is Nothing Then
        n2 = n1.nodes.Add(s(1).trim)
    End If
    If n3 Is Nothing Then
        n3 = n2.nodes.Add(s(2).trim)
    End If
    If n4 Is Nothing Then
        n4 = n3.nodes.Add(s(3).trim)
    End If
Next