ASP.NET的SEO Linq to XML---网站地图和RSS Feed

  • 来源: www.knowsky.com 作者: sevenleaf   2010-04-22/09:41
  •       网站地图的作用是让搜索引擎尽快的,更多的收录网站的各个网页。

          这里我们首先要明白一个基本的原理,搜索引擎的爬行方式。整个互联网就像一张纵横交错的“网”:网的各个节点就是各个网页,而各个网页之间通过url相互连接。蜘蛛可以从一个网页出发,通过该网页上的url,爬到另一个网页;再通过另一个网页上的url,再爬到更多的网页……,以此类推。但如果是一个新发布的网站,可能就没有其他url指向它,那么它就永远不会被“爬到”(收录)。为了解决这个问题,新站可以自己主动向搜索引擎提交url,申请蜘蛛前来抓取(Google申请网址:),但申请时一般只会提交一个主页的url。

          为了让所有的url(尤其是动态生成的)都能被蜘蛛快捷便利的检索到,我们就需要提供一个全面完整、架构清晰和更新及时的网站地图。

          和处理重复内容的robots.txt文件,我们通过.ashx文件来生成一个基于sitemaps.org的xml格式的网站地图。网站地图生成之后,我们就可以向Google等搜索引擎提交。大量的文章证实,提交网站地图将极大的提高网站的收录速度和深度。其他几乎所有的SEO方法,都有可能效果难以证实、失效甚至带来副作用,但提交网站地图除外!

          Linq to XML为我们带来了近乎完美的操作体验。

    <%@ WebHandler Language="C#" Class="website" %>

    using System;
    using System.Web;
    using System.Xml;
    using System.Xml.Linq;
    using System.Linq;

    public class website : IHttpHandler {
        public void ProcessRequest (HttpContext context) {

            context.Response.ContentType = "text/xml";

            //文件的声明信息,第第三个参数standalone的值yes 表示这个 XML 文档是自包含的(self-contained)而不依赖于外部所定义的一个 DTD.
            XDeclaration declaration = new XDeclaration("1.0", "UTF-8", "yes");
            context.Response.Write(declaration);
            //XML文件的命名空间
            XNamespace ns = "http://www.google.com/schemas/sitemap/0.84";
            XElement siteMap = new XElement(ns + "urlset");

            string fixedUrl = "http://www.freeflying.com/article";
            string wholeUrl = string.Empty;
            //循环取出数据,转换成XML节点
            foreach (var item in Articles.GetArticles())
            {
                XElement url = new XElement("url");

                wholeUrl = string.Format("{0}?id={1}&catelog={2}",fixedUrl,item.ID,item.Catelog);
                XElement loc = new XElement("loc", wholeUrl);
                XElement lastmod = new XElement("lastmod", item.LastMod.AddDays(-23).ToShortDateString());
                XElement changefreq = new XElement("changefreq", item.Frequency);
                XElement priority = new XElement("priority", item.Weight);

                url.Add(loc, lastmod, changefreq, priority);

                siteMap.Add(url);
            }
            //最后输出整个xml文件
            context.Response.Write(siteMap);
        }

        public bool IsReusable {
            get {
                return false;
            }
        }

    }

          同样还将使用到xml技术的还有RSS

    <%@ WebHandler Language="C#" Class="rss" %>

    using System;
    using System.Web;
    using System.Xml;
    using System.Xml.Linq;
    public class rss : IHttpHandler {
        public void ProcessRequest (HttpContext context) {
            context.Response.ContentType = "text/xml";

            context.Response.Write("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>");

            XElement rssFeed = new XElement("rss", new XAttribute("version","2.0"));

            string fixedUrl = "http://www.freeflying.com/article";
            string wholeUrl = string.Empty;

            XElement channel = new XElement("channel",
                new XElement("title", "freeflying"),
                new XElement("link", fixedUrl),
                new XElement("description","the website for dream flying freely"),
                new XElement("pubDate",DateTime.Now.ToString())
                );
            foreach (var article in Articles.GetArticles())
            {
                XElement item = new XElement("item");

                XElement title = new XElement("title", article.Title);

                wholeUrl = string.Format("{0}?id={1}&catelog={2}", fixedUrl, article.ID, article.Catelog);
                XElement link = new XElement("link", wholeUrl);

                XElement description = new XElement("description", article.Description);

                XElement pubDate = new XElement("pubDate", article.LastMod.ToString());

                item.Add(title,link,description,pubDate);

                channel.Add(item);
            }

            rssFeed.Add(channel);

            context.Response.Write(rssFeed);

        }

        public bool IsReusable {
            get {
                return false;
            }
        }
       

    }

    模拟数据

    using System;
    using System.Data;
    using System.Configuration;
    using System.Linq;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.HtmlControls;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Xml.Linq;
    using System.Web.UI.MobileControls;
    using System.Collections.Generic;

    /// <summary>
    /// Summary description for Articles
    /// </summary>
    public class Articles
    {
        public Articles()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        public static List<Article> GetArticles()
        {
            return new List<Article>(){
                new Article(234, "blog", DateTime.Now.AddDays(-23), Freq.none, 0.8, "asp.net seo", "articles about SEO in asp.net"),
                new Article(267, "blog", DateTime.Now.AddDays(-245), Freq.daily, 0.6, "ado.net pro","about the dataset usage"),
                new Article(653, "news", DateTime.Now.AddDays(-45), Freq.daily, 1,"CLR via C#","notebook about this book")
            };
        }
    }

    public class Article
    {
        public int ID;
        public string Catelog;
        public DateTime LastMod;
        public double Weight;
        public Freq Frequency;
        public string Title;
        public string Description;

        public Article(int id, string catelog, DateTime lastMod, Freq frequency, double weight, string title, string description)
        {
            ID = id;
            Catelog = catelog;
            LastMod = lastMod;
            Weight = weight;
            Frequency = frequency;
            Title = title;
            Description = description;
        }
    }

    public enum Freq
    {
        none = 1,
        daily = 2,
        weekly = 3,
    }


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