转 ASP.NET中不定级动态菜单的实现

前日，根据客户需要，要根据如下的表动态生成如下的菜单：表中的数据是动态更新的。 

　　我们平时IEWebContr来做菜单时都是在html中直接输入，也就是说是静态的，现在要做成动态的，而且菜单级数不定，怎么来实现呢？笔者通过研究发现，用IEWebContr来做菜单时，菜单项可以直接输入，也可以用如下的方法指定从某一个文件中读取菜单项：　　

＜iewc:TreeView runat="server" ID="Treeview1" NAME="Treeview1"＞
＜iewc:TreeNode id="Treenode1" runat="server" TreeNodeSrc="menuone.txt" Expanded="True" Text="信息类别列表"＞
＜/iewc:TreeNode＞
＜/iewc:TreeView＞　 　
　　其中menuone.txt的内容如下：　　

＜TREENODES＞
＜treenode text='蔬菜' NavigateUrl='xxcb_add.aspx?classname=蔬菜&classid=01'? Target='main1'＞
　＜treenode text='白菜' NavigateUrl='xxcb_add.aspx?classname=白菜&classid=0101'?? Target='main1'/＞
　＜treenode text='萝卜' NavigateUrl='xxcb_add.aspx?classname=萝卜&classid=0102'?? Target='main1'/＞
　＜treenode text='黄花菜' NavigateUrl='xxcb_add.aspx?classname=黄花菜&classid=0103'?? Target='main1'/＞
＜/treenode＞
＜treenode text='水果' NavigateUrl='xxcb_add.aspx?classname=水果&classid=02'? Target='main1'＞
　＜treenode text='苹果' NavigateUrl='xxcb_add.aspx?classname=苹果&classid=0201'? Target='main1'＞
　＜treenode text='红富士' NavigateUrl='xxcb_add.aspx?classname=红富士&classid=020101'?? Target='main1'/＞
＜treenode text='其它苹果' NavigateUrl='xxcb_add.aspx?classname=其它苹果&classid=020102'?? Target='main1'/＞　　
＜/treenode＞
　＜treenode text='桃子' NavigateUrl='xxcb_add.aspx?classname=桃子&classid=0202'?? Target='main1'/＞
　＜treenode text='荔枝' NavigateUrl='xxcb_add.aspx?classname=荔枝&classid=0203'?? Target='main1'/＞
＜/treenode＞
＜treenode text='粮食' NavigateUrl='xxcb_add.aspx?classname=粮食&classid=03'? Target='main1'＞
　＜treenode text='大米' NavigateUrl='xxcb_add.aspx?classname=大米&classid=0301'?? Target='main1'/＞
　＜treenode text='玉米' NavigateUrl='xxcb_add.aspx?classname=玉米&classid=0302'?? Target='main1'/＞
＜/treenode＞
＜/TREENODES＞　　
　　现在的问题变成了如何将数据表根据“类别号”修改menuone.txt文件。将该过程放在对数据表修改后进行。下面是根据表的内容生成menuone.txt的源代码：　　

Imports System.IO
Dim txtwriter As StreamWriter
txtwriter = File.CreateText(Server.MapPathstrpath ("\menuone.txt"))
txtwriter.WriteLine("＜TREENODES＞")
Dim objConn As OleDbConnection
Dim objCmd As OleDbCommand
Dim objRead As OleDbDataReader
Dim strSQL, strDSN As String
Dim strid, strname, strid1, strname1 As String
Dim strand As String
strand = "&"　　
Dim i, j, k, m As Integer
i = 0
j = 0
k = 0
m = 0
strSQL = "select * from class order by classid "
objConn = New OleDbConnection(ConfigurationSettings.AppSettings("connString"))
objCmd = New OleDbCommand(strSQL, objConn)
objCmd.Connection.Open()
objRead = objCmd.ExecuteReader()
While objRead.Read()　
　If j = 0 Then
　　j = Len(Trim(objRead.Item("classid")))
　Else
　　strid = strid1
　　strname = strname1
　　i = Len(Trim(objRead.Item("classid")))
　　k = i - j
　　Select Case k
　　　Case Is ＞ 0
　　　　txtwriter.WriteLine("＜treenode text='" & strname & "' NavigateUrl='xxcb_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "' Target='main1'＞")
　　　Case Is = 0
　　　　txtwriter.WriteLine("＜treenode text='" & strname & "' NavigateUrl='xxcb_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "' Target='main1'/＞")
　　　Case Is ＜ 0
　　　　txtwriter.WriteLine("＜treenode text='" & strname & "' NavigateUrl='xxcb_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "' Target='main1'/＞")
　　　'txtwriter.WriteLine("＜/treenode＞")
　　　m = k
　　　While m ＜ 0
　　　　txtwriter.WriteLine("＜/treenode＞")
　　　　m = m + 2
　　　End While
　　End Select
　　j = Len(Trim(objRead.Item("classid")))
　End If　
　strid1 = Trim(objRead.Item("classid"))
　strname1 = Trim(objRead.Item("classname"))
　End While　　
　'strid = strid1
　'strname = strname1
　i = Len(strid)
　k = j - i
　strid = strid1
　strname = strname1
　Select Case k
　　Case Is ＞ 0
　　　txtwriter.WriteLine("＜treenode text='" & strname & "' NavigateUrl='xxcb_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "' Target='main1'/＞")
　　　'txtwriter.WriteLine("＜/treenode＞")
　　　m = Len(strid) / 2
　　　While m ＞ 1
　　　　txtwriter.WriteLine("＜/treenode＞")
　　　　m = m - 1
　　　End While
　　Case Is = 0
　　　txtwriter.WriteLine("＜treenode text='" & strname & "' NavigateUrl='xxcb_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "' Target='main1'/＞")
　　　'txtwriter.WriteLine("＜/treenode＞")
　　　m = Len(strid) / 2
　　　While m ＞ 1
　　　　txtwriter.WriteLine("＜/treenode＞")
　　　　m = m - 1
　　　End While
　　Case Is ＜= 0
　　　txtwriter.WriteLine("＜treenode text='" & strname & "' NavigateUrl='xxcb_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "' Target='main1'/＞")
　　　'txtwriter.WriteLine("＜/treenode＞")
　　　m = Len(strid) / 2
　　　While m ＞ 1
　　　　txtwriter.WriteLine("＜/treenode＞")
　　　　m = m - 1
　　　End While
　　End Select
　　txtwriter.WriteLine("＜/TREENODES＞")
　txtwriter.Close()　 

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