在老外的站上看到解決的好方法,故簡單編譯之:
在一個asp.net 的應用中,經常要動態修改頁面的標題,一個典型的例子就是,在一個頁面導航的控制項中,希望使用者點選哪一個串連,在頁面的title裡就顯示相關的內容,舉個例子,比如一個網站,有如下的網站架構:
有圖書分類,下面再有中國圖書,外國圖書分類,則一般可以用樹形或者asp.net 2.0的新增加的瀏覽列控制項
(sitemap),來實現,比如
圖書--->中國圖書;
圖書---->外國圖書
等,而如果這個時候,能在頁面的<title>部分,也能顯示比如"圖書-->中國圖書"這樣,那就更加直觀明顯了,
在asp.net 2.0中,我們可以使用<head>部分的服務端控制項來實現了,首先,要委任標記
<head runat="server">
然後可以在page_load事件中,以如下形式改邊其title的內容了,如
Page.Header.Title = "The current time is: " & DateTime.Now.ToString()
,也可以簡單寫成page.title.
然後,我們可以通過這樣的辦法,將其於sitemap控制項結合了,實現方法如下:
Const DEFAULT_UNNAMED_PAGE_TITLE As String = "Untitled Page"
Const DEFAULT_PAGE_TITLE As String = "Welcome to my Website!!"
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Set the page's title, if needed
If String.IsNullOrEmpty(Page.Title) OrElse Page.Title = DEFAULT_UNNAMED_PAGE_TITLE Then
If SiteMap.CurrentNode Is Nothing Then
Page.Title = DEFAULT_PAGE_TITLE
Else
Page.Title = GetPageTitleBasedOnSiteNavigation()
'Can also use the following if you'd rather
'Page.Title = GetPageTitleBasedOnSiteNavigationUsingRecursion(SiteMap.CurrentNode)
End If
End If
End Sub
Private Function GetPageTitleBasedOnSiteNavigation() As String
If SiteMap.CurrentNode Is Nothing Then
Throw New ArgumentException("currentNode cannot be Nothing")
End If
'We are visiting a page defined in the site map - build up the page title
'based on the site map node's place in the hierarchy
Dim output As String = String.Empty
Dim currentNode As SiteMapNode = SiteMap.CurrentNode
While currentNode IsNot Nothing
If output.Length > 0 Then
output = currentNode.Title & " :: " & output
Else
output = currentNode.Title
End If
currentNode = currentNode.ParentNode
End While
Return output
End Function
在上面的代碼中,首先預定義了兩個常量,然後逐步建立sitemap的結點,一開始結點是null的，然後再調用
GetPageTitleBasedOnSiteNavigation() 這個過程,在每建立一個sitemap的結點時,用字串進行串連,最後返回給page.title即可實現,當然也可以用遞迴實現
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