主题：[求助]如何按列内容生成目录树？

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Dim nd As WinForm.TreeNode
For Each dr As DataRow In DataTables("表A").Select("","类别")
    Dim Path As String = dr("类别")
    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 = e.Form.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