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我還是新的ASP.NET Web編程，所以希望有人能幫助我。 我有一個水平的MainMenu和另一個水平的SubMenu正下方。新手菜單/子菜單的問題
我從數據庫到MenuCollection Session變量是子菜單的字典加載這些和它的ParentId。
當用戶點擊我想交換中並顯示正確的子菜單中的MainMenu項目。
當MainMenu.MenuItemClick事件發生的回發發生，然後我嘗試把正確的菜單從詞典進入子菜單，但它並不顯示。
我需要另一個回發的子菜單加載或需要做一些JavaScript？ 或者我正在做這個錯誤的方式？
以下是我的代碼。謝謝。
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