主题：筛选树问题

就是目录树顺序，修改生成目录树的代码，原来的代码：
 
Dim cmd As New SQLCommand
Dim dt As DataTable
cmd.CommandText = "S elect Distinct Year(日期) As 年, Month(日期) As 月, 产品 From {订单}"
dt = cmd.ExecuteReader()
Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
trv.BuildTree(dt, "年|月|产品")
trv.Nodes.Insert("显示所有行",0
 
改为：
 
Dim cmd As New SQLCommand
Dim dt As DataTable
cmd.CommandText = "S elect Distinct Year(日期) As 年, Month(日期) As 月, 产品 From {订单}"
dt = cmd.ExecuteReader()
Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
trv.BuildTree(dt, "产品|年|月")
trv.Nodes.Insert("显示所有行",0)
 
就修改了加粗的部分，列参数中三个列的位置变化了一下而已