private static void SaveLog(string log,string ex)

        {

            string strCurPath = AppDomain.CurrentDomain.BaseDirectory;

            string strErrorLogPath = Path.Combine(strCurPath, "ErrorLog");

            string strErrorLogFile = Path.Combine(strErrorLogPath, "SendEmailLog.log");

            if (!Directory.Exists(strErrorLogPath))

            {

                Directory.CreateDirectory(strErrorLogPath);

            }

            var fs = new FileStream(strErrorLogFile, FileMode.OpenOrCreate);

            var streamWriter = new StreamWriter(fs);

            streamWriter.BaseStream.Seek(0, SeekOrigin.End);

            streamWriter.WriteLine("系统记录时间：[" + DateTime.Now + "]");

            streamWriter.WriteLine("事件 ："+log);

            streamWriter.WriteLine("错误日志："+ex);

            streamWriter.WriteLine("");

            streamWriter.Flush();

            streamWriter.Close();

            fs.Close();

        }