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      首頁 > 網站開發 > ASP.net 4.0教程 >
      • asp.net教程之Web Forms - 導航

      • 2017-05-17 22:45 來源:未知

      ASP.NET 帶有內建的導航控件。

      網站導航

      維護大型網站的菜單是困難而且費時的。

      在 ASP.NET 中,菜單可存儲在文件中,這樣易于維護。文件通常名為 web.sitemap,并且被存放在網站的根目錄下。

      此外,ASP.NET 有三個心的導航控件:

      • Dynamic menus
      • TreeViews
      • Site Map Path

      Sitemap 文件

      在本教程中,使用下面的 sitemap 文件:

      
      	
      1. <?xml version="1.0" encoding="ISO-8859-1" ?> <siteMap> <siteMapNode title="Home" url="/aspnet/w3home.aspx"> <siteMapNode title="Services" url="/aspnet/w3services.aspx"> <siteMapNode title="Training" url="/aspnet/w3training.aspx"/> <siteMapNode title="Support" url="/aspnet/w3support.aspx"/> </siteMapNode> </siteMapNode> </siteMap>
      復制

      創建 sitemap 文件的規則:

      • XML 文件必須包含 圍繞內容的 <siteMap> 標簽
      • <siteMap> 標簽只能有一個 <siteMapNode> 子節點( "home" 頁面)
      • 每個 <siteMapNode> 可以有多個子節點(網頁)
      • 每個 <siteMapNode> 帶有定義頁面標題和 URL 的屬性

      注釋:sitemap 文件必須位于站點根目錄下,URL 屬性必須相對于該根目錄。

      動態菜單

      <asp:Menu> 控件可顯示標準的站點導航菜單。

      代碼實例:

      
      	
      1. <asp:SiteMapDataSource id="nav1" runat="server" /> <form runat="server"> <asp:Menu runat="server" DataSourceId="nav1" /> </form>
      復制

      上面實例中的 <asp:Menu> 控件是一個供服務器創建導航菜單的占位符。

      控件的數據源由 DataSourceId 屬性定義。 id="nav1" 把數據源連接到 <asp:SiteMapDataSource> 控件。

      <asp:SiteMapDataSource> 控件自動連接默認的 sitemap 文件(web.sitemap)。

      TreeView

      <asp:TreeView> 控件可顯示多級導航菜單。

      這種菜單看上去像一棵帶有枝葉的樹,可通過 + 或 - 符號來打開或關閉。

      代碼實例:

      
      	
      1. <asp:SiteMapDataSource id="nav1" runat="server" /> <form runat="server"> <asp:TreeView runat="server" DataSourceId="nav1" /> </form>
      復制

      上面實例中的 <asp:TreeView> 控件是一個供服務器創建導航菜單的占位符。

      控件的數據源由 DataSourceId 屬性定義。 id="nav1" 把數據源連接到 <asp:SiteMapDataSource> 控件。

      <asp:SiteMapDataSource> 控件自動連接默認的 sitemap 文件(web.sitemap)。

      SiteMapPath

      SiteMapPath 控件可顯示指向當前頁面的指針(導航路徑)。該路徑顯示為指向上級頁面的可點擊鏈接。

      與 TreeView 和 Menu 控件不同,SiteMapPath 控件不使用 SiteMapDataSource。SiteMapPath 控件默認使用 web.sitemap 文件。

      提示:如果 SiteMapPath 沒有正確顯示,很可能是由于 web.sitemap 文件中存在 URL 錯誤(打印錯誤)。

      代碼實例:

      
      	
      1. <form runat="server"> <asp:SiteMapPath runat="server" /> </form>
      復制

      上面實例中的 <asp:SiteMapPath> 控件是一個供服務器創建導航菜單的占位符。

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