C# 在每个页面标题标签中实现SEO代码

C# 在每个页面标题标签中实现SEO代码,c#,html,asp.net,asp.net-mvc,sitefinity,C#,Html,Asp.net,Asp.net Mvc,Sitefinity,我需要为不同语言或地区的页面编制多个版本的索引,以便Google搜索在位于Sitefinity顶部的ASP.NET项目页面上按语言或地区将用户指向我们页面的最合适版本 根据谷歌文档,为了实现这一点,我需要在我们的html头标签上包含下面的html代码 到底是什么不起作用?结果是什么?上面的代码应该插入'Ok',那么如果调试失败,它在哪里呢?它是否正确地创建了字符串googleLinks?如果是,是否将其添加到页眉? <HEAD> <TITLE>

我需要为不同语言或地区的页面编制多个版本的索引,以便Google搜索在位于Sitefinity顶部的ASP.NET项目页面上按语言或地区将用户指向我们页面的最合适版本

根据谷歌文档,为了实现这一点,我需要在我们的html头标签上包含下面的html代码


到底是什么不起作用?结果是什么?上面的代码应该插入'Ok',那么如果调试失败,它在哪里呢?它是否正确地创建了字符串googleLinks?如果是,是否将其添加到页眉?

    <HEAD>
    <TITLE>
    ABC
    </TITLE>
    <link rel=alternate" hreflang="de" href="http://www.NNN.co/de/ABC" />
    <link rel=alternate" hreflang="fr" href="http://www.NNN.co/fr/ABC" />
    <link rel=alternate" hreflang="x-default" href="http://www.NNN.co/en/ABC" />
    </HEAD>


protected void Application_Start(object sender, EventArgs e)
       {
           _log.Info("Application starting.");

           ObjectFactory.Initialized += ObjectFactoryInitialized;
           Bootstrapper.Initialized += Bootstrapper_Initialized;
           Bootstrapper.Initialized += BootstrapperInitialized;
           
           // NOTE: Telerik | use this event as a later one compared to the Bootstrapper_Initialized
           Bootstrapper.Bootstrapped += BootstrapperBootstrapped;
           MiniProfiler.Settings.PopupRenderPosition = RenderPosition.Right;
           ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 |
                                      SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3;

           RegisterBundlingContexts();
       }

       private void Bootstrapper_Initialized(object sender, Telerik.Sitefinity.Data.ExecutedEventArgs e)
       {
           if (e.CommandName == "Bootstrapped")
           {
               EventHub.Subscribe<IPagePreRenderCompleteEvent>(this.OnPagePreRenderCompleteEventHandler);
           }
       }

       private void OnPagePreRenderCompleteEventHandler(IPagePreRenderCompleteEvent @event)
       {
           var page = @event.Page;
           //CultureInfo DefaultCulture = CultureInfo.CurrentUICulture;

           var siteDefaultCulture = SystemManager.CurrentContext.CurrentSite.DefaultCulture ;
           var pageSiteNode = SiteMapBase.GetActualCurrentNode();
           var pageManager = PageManager.GetManager();

           var pageNode = pageManager.GetPageNode(pageSiteNode.Id);
           var publishedTranslations = pageNode.GetPageData().PublishedTranslations;

           var googleLinks = new StringBuilder();
           foreach (var culture in publishedTranslations)
           {
               var cultureInfo = new CultureInfo(culture);
               string url = HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Authority) + VirtualPathUtility.ToAbsolute(pageNode.GetFullUrl(cultureInfo, false, true));
               googleLinks.AppendLine($@"<link rel=""alternate"" hreflang=""{culture}"" href=""{url}"" />");
           }

           googleLinks.Replace($@"hreflang=""{siteDefaultCulture}""", $@"hreflang=""x-default""");

           
           page.Header.Controls.Add(new LiteralControl(googleLinks.ToString()));

       }