为什么此事件日志的EntryWrite事件永远不会触发?

我在C#控制台应用程序和C#windows服务中都有以下代码。它在控制台应用程序中工作。它拾取指定的事件,并正确调用MatchEvent()。C#windows服务中的同一代码不会拾取相同的指定事件,它不会看到它,而是看到其他事件。有问题的事件已写入应用程序日志,因此我不尝试读取安全日志。

我有什么遗漏吗?我也研究了EventLogPermission,但这似乎不适用,因为我正在从eventLog中获取事件。

守则:

private void WatchLogs()
{
    try
    {
        _eventLogs = EventLog.GetEventLogs();

        foreach (EventLog eventLog in _eventLogs)
        {
            if (eventLog.LogDisplayName.Contains("Security"))
            {
                _logger.DebugFormat(string.Format("{0}: not watching", eventLog.LogDisplayName));
            }
            else
            {
                eventLog.EntryWritten += EventLogEntryWritten;
                eventLog.EnableRaisingEvents = true;

                if (_logger.IsInfoEnabled)
                {
                    _logger.InfoFormat("Monitoring: {0} | Raising Events: {1}", eventLog.LogDisplayName,
                                       eventLog.EnableRaisingEvents);
                }
            }
        }
    }
    catch (Win32Exception ee)
    {
        _logger.DebugFormat(string.Format("{0}: not watching({1})", eventLog.LogDisplayName, ee.Message));
    }
    catch (SecurityException securityException)
    {
        _logger.ErrorFormat("Error accessing eventlog: {0} : {1}", eventLog.LogDisplayName, securityException.Message);
    }
}

private void EventLogEntryWritten(object sender, EntryWrittenEventArgs currentEvent)
{
  var log = (EventLog) sender;

  if (_logger.IsDebugEnabled)
    _logger.DebugFormat(
      "Event Raised: |Log:{0}|Source:{1}|EventID:{2}|",log.LogDisplayName,
        currentEvent.Entry.Source,currentEvent.Entry.EventID);

  MatchEvent(currentEvent);
}