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ASP.NET中不定级动态菜单的实现
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〉
&n bsp;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.MapPath("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=@#adminclass_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "@# Target=@#main2@#>")
Case Is = 0
txtwriter.WriteLine("<treenode text=@#" & strname & "@# NavigateUrl=@#adminclass_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "@# Target=@#main2@#/>")
Case Is < 0
txtwriter.WriteLine("<treenode text=@#" & strname & "@# NavigateUrl=@#adminclass_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "@# Target=@#main2@#/>")
@#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=@#adminclass_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "@# Target=@#main2@#/>")
@#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=@#adminclass_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "@# Target=@#main2@#/>")
@#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=@#adminclass_add.aspx?classname=" & strname & "" & strand & "classid=" & strid & "@# Target=@#main2@#/>")
@#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()
End Sub
Sub creatmenuone(ByVal strpath As String)
Dim txtwriter As StreamWriter
txtwriter = File.CreateText(strpath + ("\..\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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