写入系统日志

     private void WriteLog(Exception ex)
        {         
            if (!EventLog.SourceExists("Eventhandlerw"))
            {
                EventLog.CreateEventSource("Eventhandlerw", "MyLog");
            }
            EventLog.WriteEntry("Eventhandlerw", ex.ToString(), EventLogEntryType.Error);

        }

 

   当Eventhandlerw在系统日志中不存在时，就会创建一个源MyLog