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ASP.NET中不定级动态菜单的实现

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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?

作者:中国IT实验室 来源:中国IT实验室 2007年9月3日

关键字: 动态菜单 ASP.NET

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  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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