主题：生成目录树时出现错误，请指教，谢谢

参考代码

'先生成GB统计表
'首先生成统计表
Dim dt As DataTable
Dim b As New GroupTableBuilder("统计表1",DataTables("GB管理"))
b.Groups.AddDef("分公司")
b.Groups.AddDef("级别")
b.Totals.AddDef("级别",AggregateEnum.Count,"人数") '根据客户列来统计记录数,也就是订单数
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(dt, "分公司|级别")
trv.StopRedraw
For Each nd As WinForm.TreeNode In trv.AllNodes
    Dim Area As String = nd.DataRow("分公司")
    Dim Lev As String = nd.DataRow("级别")
    Dim No As Integer = nd.DataRow("人数")
    Select Case nd.Level
        Case 0
            nd.Text = nd.text & "分公司(" & dt.Compute("Sum(人数)","分公司 = '" & Area & "'") & "人)"
        Case 1
            nd.Text = nd.text & "级别(" & dt.Compute("Sum(人数)","分公司 = '" & Area & "' And 级别 = '" & Lev & "'”) & "人)"
        Case 2
            nd.Text = nd.text & "(" & nd.DataRow("人数") & "条)"
    End Select
Next

trv.Nodes.Insert("GB管理统计","按地区划分,GB管理统计(" & dt.Compute("Sum(人数)") & "人)",0)
trv.ResumeRedraw

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