using System;using System.Collections.Generic;using System.IO;using System.Threading;using System.Xml;namespace Helper{  public class SitemapXml  {    private const string Xmlns = "http://www.sitemaps.org/schemas/sitemap/0.9";    private const string XmlnsXsi = "http://www.w3.org/2001/XMLSchema-instance";    private const string XsiSchemaLocation = "http://www.sitemaps.org/schemas/sitemap/0.9  http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd";    /// <summary>    /// 生成SiteMap地图    /// </summary>    /// <param name="siteMaps">需要生成的 对象列表</param>    /// <param name="saveFileName">设置文件保存名称</param>    /// <param name="changefreq">更新周期</param>    /// <param name="savePath">xml文件保存路径</param>    /// <returns></returns>    public static bool CreateSiteMapXml(List<SiteMap> siteMaps, string savePath = "/", string saveFileName = "sitemap", string changefreq = "weekly")    {      //保存创建好的XML文档      string filename = saveFileName + ".xml";      string path = System.Web.HttpContext.Current.Server.MapPath(savePath) + filename;      //先创建XML,返回路径      var xmldoc = new XmlDocument();      //加入XML的声明段落,<?xml version="1.0" encoding="gb2312"?>      XmlDeclaration xmldecl = xmldoc.CreateXmlDeclaration("1.0", "UTF-8", null);      xmldoc.AppendChild(xmldecl);      //加入一个根元素      XmlNode xmlelem = xmldoc.CreateElement("", "urlset", "");      //添加属性      XmlAttribute attr = xmldoc.CreateAttribute("xmlns");      attr.Value = Xmlns;      if (xmlelem.Attributes != null) xmlelem.Attributes.SetNamedItem(attr);      attr = xmldoc.CreateAttribute("xmlns:xsi");      attr.Value = XmlnsXsi;      if (xmlelem.Attributes != null) xmlelem.Attributes.SetNamedItem(attr);      attr = xmldoc.CreateAttribute("xsi:schemaLocation");      attr.Value = XsiSchemaLocation;      if (xmlelem.Attributes != null) xmlelem.Attributes.SetNamedItem(attr);      xmldoc.AppendChild(xmlelem);      string lastmod = DateTime.Now.ToString("yyyy-MM-dd");      for (int i = 0; i < siteMaps.Count; i++)      {        XmlNode root = xmldoc.SelectSingleNode("urlset");//查找<urlset>         if (root == null)        {          //加入一个根元素          xmlelem = xmldoc.CreateElement("", "urlset", "");          //添加属性          attr = xmldoc.CreateAttribute("xmlns");          attr.Value = Xmlns;          if (xmlelem.Attributes != null) xmlelem.Attributes.SetNamedItem(attr);          attr = xmldoc.CreateAttribute("xmlns:xsi");          attr.Value = XmlnsXsi;          if (xmlelem.Attributes != null) xmlelem.Attributes.SetNamedItem(attr);          attr = xmldoc.CreateAttribute("xsi:schemaLocation");          attr.Value = XsiSchemaLocation;          if (xmlelem.Attributes != null) xmlelem.Attributes.SetNamedItem(attr);          xmldoc.AppendChild(xmlelem);          i = 0;          continue;        }        XmlElement xe1 = xmldoc.CreateElement("url");//创建一个<url>节点         XmlElement xmlelem1 = xmldoc.CreateElement("", "loc", "");        XmlText xmltext = xmldoc.CreateTextNode(siteMaps[i].Loc);        xmlelem1.AppendChild(xmltext);        xe1.AppendChild(xmlelem1);        xmlelem1 = xmldoc.CreateElement("", "priority", "");        xmltext = xmldoc.CreateTextNode(siteMaps[i].Priority);        xmlelem1.AppendChild(xmltext);        xe1.AppendChild(xmlelem1);        xmlelem1 = xmldoc.CreateElement("", "lastmod", "");        xmltext = xmldoc.CreateTextNode(lastmod);        xmlelem1.AppendChild(xmltext);        xe1.AppendChild(xmlelem1);        xmlelem1 = xmldoc.CreateElement("", "changefreq", "");        xmltext = xmldoc.CreateTextNode(changefreq);        xmlelem1.AppendChild(xmltext);        xe1.AppendChild(xmlelem1);        root.AppendChild(xe1);//添加到<urlset>节点中       }      try      {        //然后在保存到源位置        xmldoc.AppendChild(xmlelem);        xmldoc.Save(path);        return true;      }      catch (Exception)      {        return false;      }    }  }  /// <summary>  ///   /// <url>  /// <loc>http://news.chinahbnet.com/2014/8/19/15352.html</loc>  /// <priority>0.5</priority>  /// <lastmod>2014-08-19</lastmod>  /// <changefreq>weekly</changefreq>  /// </url>  ///   /// </summary>  public class SiteMap  {    /// <summary>    /// 链接地址    /// 如：http://news.chinahbnet.com    /// </summary>    public string Loc { get; set; }    /// <summary>    /// 网页权重    /// 0.1 - 1    /// </summary>    public string Priority { get; set; }    /// <summary>    /// 生成日期    /// 2014-08-19    /// </summary>    public string Lastmod { get; set; }    /// <summary>    /// 更新周期    /// always  经常    /// hourly  每小时    /// daily   每天    /// weekly  每周    /// monthly 每月    /// yearly  每年    /// never   从不    /// </summary>    public string Changefreq { get; set; }  }}生成的结果为：<?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9  http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">  <url>    <loc>http://www.baidu.com</loc>    <priority>1.00</priority>    <lastmod>2014-08-19</lastmod>    <changefreq>weekly</changefreq>  </url></urlset>