xml文件操作帮助类

/// <summary>
        /// 保存单个点节点的值
        /// </summary>
        /// <param name="UpNodeName">父级节点名称</param>
        /// <param name="NodeName">子节点名称</param>
        /// <param name="NodeNumber">子节点值</param>
        /// <returns></returns>
        public static bool SaveInfoXMl(string UpNodeName, string NodeName, string NodeNumber)
        {
            XmlDocument doc = new XmlDocument();
            try
            {
                doc.Load("ArchivesConfig.xml");//加载XML文件，ArchivesConfig.xml是xml文件名
                XmlNode xl = doc.SelectSingleNode("YY_ArchivesMangeConfig");//根节点1，YY_ArchivesMangeConfig是根节点名称
                XmlNode xll = xl.SelectSingleNode(UpNodeName);
                XmlNode xmlnod = xll.SelectSingleNode(NodeName);
                ((XmlElement)xmlnod).InnerText = NodeNumber;
                doc.Save("ArchivesConfig.xml");
                return true;
            }
            catch
            {
                return false;
            }
        }
        /// <summary>
        /// 根据父亲节点和子节点名称获取子节点的值
        /// </summary>
        /// <param name="UpNodeName">父节点</param>
        /// <param name="NodeName">子节点</param>
        /// <returns></returns>
        public static string GetXmlNumber(string UpNodeName, string NodeName)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load("ArchivesConfig.xml");//加载XML文件，ArchivesConfig.xml是xml文件名
                XmlNode xl = doc.SelectSingleNode("YY_ArchivesMangeConfig");//根节点1，YY_ArchivesMangeConfig是根节点名称
                XmlNode xll = xl.SelectSingleNode(UpNodeName);
                XmlNode xmlnod = xll.SelectSingleNode(NodeName);
                string Number = xmlnod.InnerText;
                Number = Number.Replace("&lt;", "<");
                Number = Number.Replace("&gt;", ">");
                Number = Number.Replace("&amp;", "&");
                Number = Number.Replace(" &apos;", "‘");
                return xmlnod.InnerText;
            }
            catch
            {
                return null;
            }
        }