ASP.NET中不定级动态菜单的实现
发布时间:2006-10-14 3:16:33   收集提供:gaoqian

作者:xiangwa  出处:CSDN

 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 = "&amp;"
 
 
  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()
 

  这样menuone.txt就按要求生成了菜单源文件。

 
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