发布日期:
2010-02-28 21:19 发布者: cobra
原版编程图书超低价热卖
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上一篇: ASP.NET 的SEO:HTTP报头状态码---内容重定向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。(文/ 自由飞) 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。( 网站地图的更多信息)。 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。 WebSite - <%@ 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;
- }
- }
- }
复制代码同样还将使用到xml技术的还有RSS 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;
- }
- }
-
- }
复制代码模拟数据 - 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,
- }
复制代码下一篇: ASP.NET 的SEO:SEO Hack --- Html注入和Nofollow
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