ASP.NET MVC 优化笔记 -SEO

1.站点地图构建：

    

   /// <summary>
   ///  实现XML格式 站点地图输出
   ///  By:rhythmk.cnblogs.com
   /// </summary>
    public class SitemapResult : ActionResult
    {
        public SitemapResult(Sitemap sitemap)
        {
            this.Sitemap = sitemap;
        }

        public Sitemap Sitemap { get; private set; }

        public override void ExecuteResult(ControllerContext context)
        {
            context.HttpContext.Response.ContentType = "text/xml";
            XmlSerializer serializer = new XmlSerializer(typeof(Sitemap));
            serializer.Serialize(context.HttpContext.Response.Output,
                                 this.Sitemap);
        }
    }

    /// <summary>
    /// 站点地图实体
    ///  By:rhythmk.cnblogs.com
    /// </summary>
    [XmlRoot(ElementName = "urlset", Namespace = "http://www.sitemaps.org/schemas/sitemap/0.9")]
    [Serializable]
    public class Sitemap : List<SitemapUrl>
    {


        [XmlInclude(typeof(SitemapUrl))]
        public void Serialize(TextWriter writer)
        {
            XmlSerializer serializer = new XmlSerializer(typeof(Sitemap));
            XmlTextWriter xmlTextWriter = new XmlTextWriter(writer);
            serializer.Serialize(xmlTextWriter,
                                 this);
        }


    }

    [XmlRoot(ElementName = "url")]
    [XmlType(TypeName = "url")]
    [Serializable]
    public class SitemapUrl
    {
        private DateTime lastModified;



        [XmlElement(ElementName = "loc")]
        public string Location { get; set; }

        [XmlElement(ElementName = "lastmod")]
        public string LastModified
        {
            get
            {
                if (DateTime.MinValue.Equals(this.lastModified))
                {
                    this.lastModified = DateTime.Now;
                }

                return this.lastModified.ToString("yyyy-MM-dd");
            }
            set { this.lastModified = DateTime.Parse(value); }
        }

        [XmlElement(ElementName = "changefreq")]
        public ChangeFrequency ChangeFrequency { get; set; }

        [XmlElement(ElementName = "priority")]
        public double Priority { get; set; }


    }


    public enum ChangeFrequency
    {
        always,
        hourly,
        daily,
        weekly,
        monthly,
        yearly,
        never
    }

 使用：

        /// <summary>
        ///   站点地图
        /// </summary>
        /// <param name="pageIndex"> 页面索引</param>
        /// <param name="subjectID"> 科目 </param>
        /// <returns></returns>

        public ActionResult Index(int subjectID = 0, int pageIndex = 1)
        {
            int total = 0;
            int pageSize=2000;
            var list = GetExamList(subjectID, pageIndex, pageSize,ref total);
            Sitemap site = new Sitemap();
            var time= DateTime.Now.ToLongDateString() ;
            
            foreach (var p in list)
            {
                site.Add(new SitemapUrl()
                {
                    ChangeFrequency = ChangeFrequency.weekly,
                    LastModified = time,
                    Location = string.Format("http://rhythmk/home/view/{0}?t={1}", p.ExaminationID , p.ExaminationTitle),
                    Priority = 0.7
                });
            }

            return new SitemapResult(site);

        }

2.判断是否为搜索引擎：

 

  /// <summary>
        /// 判断是否为搜索引擎访问
        /// </summary>
        /// <param name="useragent"></param>
        /// <returns></returns>
        public static bool IsSearchEngine(string useragent)
        {
            bool engine = false;
            if (!string.IsNullOrEmpty(useragent))
            {
                var SpiderKey = System.Configuration.ConfigurationManager.AppSettings["SpiderKey"].ToString();
                // spiderkey=@"Googlebot|Feedfetcher-Google|Baiduspider|Yahoo\s*\!\s*Slurp|YodaoBot|Sosoimagespider|Sosospider|Sogou\s*Web\s*Sprider"
                System.Text.RegularExpressions.Regex rx = new System.Text.RegularExpressions.Regex(SpiderKey, RegexOptions.IgnoreCase | RegexOptions.Compiled);
                engine = rx.IsMatch(useragent);
            }
            return engine;
        }

           public  ActionResult View()
           {
           
           bool engine = IsSearchEngine( this.HttpContext.Request.ServerVariables["Http_User_Agent"]);
            
             // 判断是否为搜索引擎 然后使用不同的试图呈现数据 
            if (engine)
            {
               
                return View("SearchView", entity);
            }
            else
            {
                return View(entity);
            }
            }

3. 检验是否成功：

   修改浏览器   Http_User_Agent   值，以达到模拟搜索引擎爬虫浏览效果。

  以火狐为例：

   3.1地址栏键入：about:config 回车

   3.2 设置：general.useragent.override–>"Baiduspider" 。可以达到模拟百度爬虫效果。

     火符默认:Mozilla/5.0 (Windows; U; Windows NT 6.0; zh-CN) AppleWebKit/525.19 (KHTML, like Gecko) Chrome/0.4.154.29 Safari/525.19

   设置完成后可以通过浏览http://www.docin.com/p-259119935.html 此网址 于其他未设置的浏览器比较 浏览页面效果。