生成 网站“面包屑” XML

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>