C#操作XML



   #region 操作XML
        private static XmlDocument xmldoc = new XmlDocument();
        private static JM_A ja = new JM_A();
        /// <summary>
        /// 查询XML
        /// </summary>
        /// <param name="key">查找标记</param>
        /// <returns>XML值</returns>
        public static String xml_select(String key)
        {
            try
            {
                xmldoc.Load("config.xml");
                XmlNode root = xmldoc.SelectSingleNode("info");
                XmlNodeList Li = root.ChildNodes;
                String value = "";
                foreach (XmlNode item in Li)
                {
                    XmlElement eL = (XmlElement)item;
                    if (key == eL.Name)
                    {
                        value = eL.InnerText;
                        break;
                    }
                }
                return ja.AESDecrypt(value);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
                return "";
                throw new Exception("XML操作出错");
            }
        }
        /// <summary>
        /// 修改XML
        /// </summary>
        /// <param name="key">键</param>
        /// <param name="value">值</param>
        public static void xml_update(String key, String value)
        {
            try
            {
                xmldoc.Load("config.xml");
                XmlNode root = xmldoc.SelectSingleNode("info");
                XmlNodeList Li = root.ChildNodes;
                foreach (XmlNode item in Li)
                {
                    XmlElement eL = (XmlElement)item;
                    if (key == eL.Name)
                    {
                        Console.WriteLine("111111");
                        eL.InnerText = ja.AESEncrypt(value);
                        xmldoc.Save("config.xml");
                        break;
                    }
                }
            }
            catch
            {
                throw new Exception("XML操作出错");
            }
        }
        #endregion
    }