while (ex != null)

{

WriteExceptionLog(ex, fileName);

ex = ex.InnerException;

}

        /// <summary>

        /// 将异常处理成字符串的形式,然后写入文件

        /// </summary>

        /// <param name="ex"></param>

        /// <param name="fileName"></param>

        private void WriteExceptionLog(Exception ex, string fileName)

        {

            WriteLog(string.Format("错误信息:{0}{1}异常类型:{2}{1}程序集:{3}{1}方法:{4}{1}跟踪栈信息:{1}{5}{1}",

                  ex.Message,

                  Environment.NewLine,

                  ex.GetType(),

                  ex.Source,

                  ex.TargetSite,

                  ex.StackTrace),

                  fileName);//写入文件

        }