【NET】生成SiteMap网站地图

之前没有用过sitemap，最近做项目接触到sitemap，做下记录

生成如下XML格式文件

<?xml version="1.0" encoding="utf-8"?>
<urlset>
  <url>
    <loc>URL地址</loc>
    <lastmod>最新修改日期</lastmod>
    <changefreq>更新频率</changefreq>
    <priority>权重</priority>
  </url>
</urlset>

/// <summary>
/// 初始化站点列表
/// </summary>
/// <param name="list"></param>
public static void CreateSiteXml(Dictionary<Guid, string> list)
{
    XmlDocument doc = null;
    XmlElement root = null;
    int allCount = list.Count;
    // 网址不得超过 5 万个，且文件大小不得超过 10 MB
    const int siteCountFile = 30000;
    int createMod = allCount / siteCountFile + (allCount % siteCountFile > 0 ? 1 : 0);

    // 循环创建XML
    for (int i = 1; i <= createMod; i++)
    {
        doc = new XmlDocument();
        XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "utf-8", null);
        doc.AppendChild(dec);
        root = doc.CreateElement("urlset");

        int currMod = 0;

        // 循环添加URL
        foreach (var item in list.Skip((i - 1) * siteCountFile))
        {
            if (currMod < siteCountFile)
            {
                // 链接地址,长度不得超过256字节
                XmlElement url = doc.CreateElement("url");
                XmlElement url_loc = doc.CreateElement("loc");
                url_loc.InnerText = item.Value.ToLower();
                url.AppendChild(url_loc);

                // 链接的最后更新时间
                XmlElement url_lastmod = doc.CreateElement("lastmod");
                url_lastmod.InnerText = DateTime.Now.ToString("yyyy-MM-dd");
                url.AppendChild(url_lastmod);

                // 链接可能会出现的更新频率
                XmlElement url_changefreq = doc.CreateElement("changefreq");
                url_changefreq.InnerText = "daily";
                url.AppendChild(url_changefreq);

                // 链接的优先权比值，此值定于0.0-1.0之间
                XmlElement url_priority = doc.CreateElement("priority");
                url_priority.InnerText = "0.8";
                url.AppendChild(url_priority);

                root.AppendChild(url);

            }
            currMod++;
        }

        doc.AppendChild(root);

        // 保存XML
        string SiteMapDir = System.Web.HttpContext.Current.Server.MapPath("/SiteMap/sitemap");
        string fullFileName = SiteMapDir + string.Format("{0:d5}", i) + ".xml";
        doc.Save(fullFileName);
    }
}

/// <summary>
/// 插入
/// </summary>
/// <param name="str"></param>
public static void InsertSiteXml(string str)
{
    if (string.IsNullOrWhiteSpace(str))
        return;
    const int siteCountFile = 30000;
    string SiteMapDir = System.Web.HttpContext.Current.Server.MapPath("/SiteMap/");
    string[] file = Directory.GetFiles(SiteMapDir);
    for (int i = 1; i < file.Length; i++)
    {
        XmlDocument xml = new XmlDocument();
        try
        {
            xml.Load(file[i]);
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        XmlNodeList xmlNodes = xml.SelectNodes("/urlset/url");
        if (xmlNodes.Count < siteCountFile)
        {
            XmlNode _root = xml.SelectSingleNode("/urlset");
            XmlNode _url = xml.CreateElement("url");
            XmlNode _url_loc = xml.CreateElement("loc");
            _url_loc.InnerText = str.Trim().ToLower();
            _url.AppendChild(_url_loc);
            _root.AppendChild(_url);
            xml.Save(file[i]);
            return;
        }
    }

    XmlDocument doc = new XmlDocument();
    XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "utf-8", null);
    doc.AppendChild(dec);
    XmlElement root = doc.CreateElement("urlset");

    XmlElement url = doc.CreateElement("url");
    XmlElement url_loc = doc.CreateElement("loc");
    url_loc.InnerText = str.Trim().ToLower();
    url.AppendChild(url_loc);

    root.AppendChild(url);
    doc.AppendChild(root);
    // 保存XML
    string fullFileName = SiteMapDir + string.Format("sitemap{0:d5}", file.Count()) + ".xml";
    doc.Save(fullFileName);
}

/// <summary>
/// 删除
/// </summary>
/// <param name="str"></param>
public static void DeleteSiteXml(string str)
{
    if (string.IsNullOrWhiteSpace(str))
        return;
    string SiteMapDir = System.Web.HttpContext.Current.Server.MapPath("/SiteMap/");
    string[] file = Directory.GetFiles(SiteMapDir);
    for (int i = 0; i < file.Length; i++)
    {
        XmlDocument xml = new XmlDocument();
        try
        {
            xml.Load(file[i]);
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        XmlNodeList xmlNodes = xml.SelectNodes("/urlset/url");
        for (int k = 0; k < xmlNodes.Count; k++)
        {
            XmlNode node = xmlNodes[k];
            string text = node.FirstChild.InnerText;
            if (text.Equals(str.Trim(), StringComparison.OrdinalIgnoreCase))
            {
                XmlNode _root = xml.SelectSingleNode("/urlset");
                _root.RemoveChild(node);
                xml.Save(file[i]);
                return;
            }
        }
    }
}