/// <summary>
/// 创建节点
/// </summary>
/// <param name="strUrl">链接地址</param>
/// <param name="dLastMod">最后修改时间</param>
/// <param name="strChangeFreq">更新频率</param>
/// <returns>返回节点</returns>
private static XmlNode CreateNode(string strUrl,DateTime dLastMod, string strChangeFreq)
{XmlNode xNodeUrl = xd.CreateElement("url");XmlNode nodeLoc = xd.CreateElement("loc");nodeLoc.InnerText = strUrl;xNodeUrl.AppendChild(nodeLoc);XmlNode nodeLastMod = xd.CreateElement("lastmod");nodeLastMod.InnerText = dLastMod.ToString("yyyy-MM-ddThh:mm:ss+00:00");xNodeUrl.AppendChild(nodeLastMod);XmlNode nodeChangeFreq = xd.CreateElement("changefreq");nodeChangeFreq.InnerText = strChangeFreq;xNodeUrl.AppendChild(nodeChangeFreq);return xNodeUrl;
}

static XmlDocument xd = new XmlDocument();/// <summary>
/// 输出 Sitemap
/// </summary>
/// <param name="article">List<Article></param>
public static void WriteSitemap(List<Article> article)
{string strFile = HttpRuntime.AppDomainAppPath + "xml/sitemap.xml";XmlNode rootNode = xd.CreateElement("urlset");XmlAttribute attrXmlNS = xd.CreateAttribute("xmlns");attrXmlNS.InnerText = "http://www.sitemaps.org/schemas/sitemap/0.9";rootNode.Attributes.Append(attrXmlNS);// 网站首页rootNode.AppendChild(CreateNode("http://www.lidongkui.com/", DateTime.Now, "daily"));//创建各文章节点 <url></url>foreach (Article a in article){rootNode.AppendChild(CreateNode("http://www.lidongkui.com/" + a.UrlName, a.AddTime, "monthly"));}xd.AppendChild(rootNode);xd.InsertBefore(xd.CreateXmlDeclaration("1.0", "UTF-8", null), rootNode);xd.Save(strFile);
}

//google
System.Net.WebRequest reqGoogle = System.Net.WebRequest.Create("http://www.google.com/webmasters/tools/ping?sitemap=" +HttpUtility.UrlEncode("http://www.lidongkui.com/xml/sitemap.xml"));
reqGoogle.GetResponse();//ask
System.Net.WebRequest reqAsk = System.Net.WebRequest.Create("http://submissions.ask.com/ping?sitemap=" +HttpUtility.UrlEncode("http://www.lidongkui.com/xml/sitemap.xml"));
reqAsk.GetResponse();//yahoo
System.Net.WebRequest reqYahoo = System.Net.WebRequest.Create("http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid=YahooDemo&url=" +HttpUtility.UrlEncode("http://www.lidongkui.com/xml/sitemap.xml"));
reqYahoo.GetResponse();//bing
System.Net.WebRequest reqBing = System.Net.WebRequest.Create("http://www.bing.com/webmaster/ping.aspx?siteMap=" +HttpUtility.UrlEncode("http://www.lidongkui.com/xml/sitemap.xml"));
reqBing.GetResponse();