主题：[求助]如何按列内容生成目录树？

Dim nd As WinForm.TreeNode
Dim Names As List(Of String) = DataTables("表A").GetUniqueValues("类别 Is not Null", "类别")
For Each Name As String In Names
    Dim Path As String = Name
    Dim Parts() As String = Path.Split("\")
    Dim Start As Integer
    If nd IsNot Nothing Then
        Do
            If Path.StartsWith(nd.FullPath) Then
                Start = nd.Level + 1
                nd = nd.Nodes.Add(Parts(Start),Parts(start))
                Start = nd.Level + 1
                Exit do
            Else
                nd = nd.ParentNode
                If nd Is Nothing Then
                    Exit do
                End If
            End If
        Loop
    End If
    If nd Is Nothing Then
        nd = Forms("窗口1").Controls("TreeView1").Nodes.Add(Parts(0),Parts(0))
        start = 1
    End If
    For i As Integer = Start To Parts.Length - 1
        nd = nd.Nodes.Add(Parts(i),Parts(i))
    Next
Next