/// <summary>        /// 写错误日志        /// </summary>        /// <param name="ex"></param>        public static void WriteErrorLog(Exception ex)        {                       DataTable dt = new DataTable("ErrorLog");            dt.Columns.Add("Date");            dt.Columns.Add("Message");            DataRow dr = dt.NewRow();            dr["Date"] = DateTime.Now;            dr["Message"] = ex.Message;            dt.Rows.Add(dr);            string path = Config.GetConfigValue("BASE_ERROR_FOLDER");//路径            //目录是否存在            if (!Directory.Exists(path))            {                Directory.CreateDirectory(path);            }            string fullPath = path + "errorLog.xml";            //文件是否存在            if (!File.Exists(fullPath))            {                dt.WriteXml(fullPath, XmlWriteMode.WriteSchema);                           }            else {                AppandXml(ex, fullPath);//存在，则追加            }                   }

/// <summary>        /// 追加写入XML文件        /// </summary>        /// <param name="ex"></param>        /// <param name="fullPath">文件全路径</param>        public static void AppandXml(Exception ex, string fullPath)        {            XmlDocument xmlDoc = new XmlDocument();            xmlDoc.Load(fullPath);            XmlNode root = xmlDoc.SelectSingleNode("NewDataSet");//查找到根目录            XmlElement errorLog_ele = xmlDoc.CreateElement("ErrorLog");            XmlElement date_ele = xmlDoc.CreateElement("Date");            date_ele.InnerText = DateTime.Now.ToString();            errorLog_ele.AppendChild(date_ele);            XmlElement message_ele = xmlDoc.CreateElement("Message");            message_ele.InnerText =ex.Message;            errorLog_ele.AppendChild(message_ele);            root.AppendChild(errorLog_ele);            xmlDoc.Save(fullPath);        }       

string filePath = (string)(Config.GetDataPath(StatType, Year, Week));            DataTable dt = new DataTable();            dt.ReadXml(filePath);