1
我还是新的ASP.NET Web编程，所以希望有人能帮助我。 我有一个水平的MainMenu和另一个水平的SubMenu正下方。新手菜单/子菜单的问题
我从数据库到MenuCollection Session变量是子菜单的字典加载这些和它的ParentId。
当用户点击我想交换中并显示正确的子菜单中的MainMenu项目。
当MainMenu.MenuItemClick事件发生的回发发生，然后我尝试把正确的菜单从词典进入子菜单，但它并不显示。
我需要另一个回发的子菜单加载或需要做一些JavaScript？ 或者我正在做这个错误的方式？
以下是我的代码。谢谢。
Imports System.Data
Imports System.Data.SqlClient
Imports System.Collections.Generic
Public Class RootMaster
Inherits System.Web.UI.MasterPage
Private ReadOnly connection As String = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
Session("MenuData") = GetMenuData()
AddTopMenuItems(Session("MenuData"))
End If
End Sub
Private Function GetMenuData() As DataTable
Using con As New SqlConnection(connection)
Dim cmd As New SqlCommand("Select * from MenuData", con)
Dim dtMenuItems As New DataTable()
Dim sda As New SqlDataAdapter(cmd)
sda.Fill(dtMenuItems)
cmd.Dispose()
sda.Dispose()
Return dtMenuItems
End Using
End Function
Private Sub AddTopMenuItems(menuData As DataTable)
Dim view As DataView = Nothing
Dim MenuDictionary As New Dictionary(Of Integer, Menu)
view = New DataView(menuData)
view.RowFilter = "ParentId IS NULL"
For Each row As DataRowView In view
'Adding the menu item'
If row("IsActive") Then
Dim RowId As Integer = row("Id")
Dim newMenuItem As New MenuItem(row("Text").ToString(), RowId.ToString())
newMenuItem.NavigateUrl = row("NavigateUrl").ToString()
MainMenu.Items.Add(newMenuItem)
'Create all sub menus for each main menu item, add to dictionary'
Dim SubM = CreateSubMenus(menuData, newMenuItem)
If SubM.Items.Count > 0 Then
MenuDictionary.Add(RowId, SubM)
End If
End If
Next
Session("MenuCollection") = MenuDictionary
MainMenu.Items(0).Selected = True
view = Nothing
End Sub
Private Function CreateSubMenus(menuData As DataTable, parentMenuItem As MenuItem) As Menu
Dim view As DataView = Nothing
Dim Result As New Menu
view = New DataView(menuData)
view.RowFilter = "ParentId=" & parentMenuItem.Value
For Each row As DataRowView In view
If row("IsActive") Then
Dim newMenuItem As New MenuItem(row("Text").ToString(), row("Id").ToString())
newMenuItem.NavigateUrl = row("NavigateUrl").ToString()
Result.Items.Add(newMenuItem)
End If
Next
Return Result
End Function
Protected Sub MainMenu_ItemClick(source As Object, e As MenuEventArgs) Handles MainMenu.MenuItemClick
If Not Session("MenuCollection") Is Nothing Then
Dim MenuDictionary As Dictionary(Of Integer, Menu) = DirectCast(Session("MenuCollection"), Dictionary(Of Integer, Menu))
If MenuDictionary.ContainsKey(e.Item.Value) Then
SubMenu = MenuDictionary.Item(e.Item.Value)
End If
End If
End Sub
End Class