主题：如何统计目录树各节点数据

Dim dt As DataTable

Dim b As New GroupTableBuilder("统计表1",DataTables("房间信息"))

b.Groups.AddDef("地点")

b.Groups.AddDef("楼层")

b.Groups.AddDef("房号")

b.Totals.AddDef("房号",AggregateEnum.count,"房间数") '根据房号列来统计记录数,也就是房间数

dt = b.Build(False) '参数设置为False,生成一个临时表,不在主界面显示

'然后根据统计表生成目录树

Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")

trv.BuildTree("房间信息", "地点|楼层",,"房号")

trv.StopRedraw

For Each nd As WinForm.TreeNode In trv.AllNodes

    Dim dd As String = nd.DataRow("地点")

    Dim lc As String = nd.DataRow("楼层")

    Select Case nd.Level

        Case 0

            nd.Text =  "(" & dt.Compute("count(房号)","地点 = " & dd) & "间)"

             

        Case 1

            nd.Text = "(" & dt.Compute("count(房号)","地点 = " & dd & "and 楼层 = " & lc) & "间)"

             

       Case 2

           nd.Text = nd.text & "(" & nd.DataRow("房号") & "间)"

    End Select

Next

trv.Nodes.Insert("显示所有行","显示所有行(" & dt.Compute("count(房号)") & "间)",0)

trv.ResumeRedraw

遍历好像不对，请教如何修改，能正确显示目录树统计数据