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 = ; 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 = ;

          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>--</lastmod>

    <changefreq>weekly</changefreq>

  </url>

</urlset>