ConfigurationErrorsException - 进程无法访问文件 'c:\eventlog.config'，因为它正被另一个进程使用

Question

团队，

我有这段代码，它总是在某种竞争条件下将自己捆绑在一起，尤其是当两个或多个资源试图同时写入 eventlog.config 文件时。我已经用谷歌搜索了几个渠道，但无法解决这个错误。谁能帮我修改这段代码，以便我可以消除竞争条件。

private void UpdateLastEventId(IList<EventLogEntry> entries)
    {
        if (entries.Count > 0)
        {
            EventLogEntry lastEntry = entries[entries.Count - 1];

            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            var configSettings = config.AppSettings.Settings;

            string key = string.Format(CultureInfo.InvariantCulture, "{0}|{1}", _eventLogFilter.EventLog, _eventLogFilter.MD5Hash);
            if (configSettings[key] == null)
            {
                configSettings.Add(key, lastEntry.Index.ToString(CultureInfo.InvariantCulture));
            }
            else
            {
                configSettings[key].Value = lastEntry.Index.ToString(CultureInfo.InvariantCulture);
            }
            config.Save(ConfigurationSaveMode.Modified);//Error seems to happen here
        }
    }

Answer 1

    private static readonly object _configLogLock = new object();
    private void UpdateLastEventId(IList<EventLogEntry> entries)
    {
        if (entries.Count > 0)
        {
            EventLogEntry lastEntry = entries[entries.Count - 1];

            lock (_configLogLock)
            {
                Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                var configSettings = config.AppSettings.Settings;

                string key = string.Format(CultureInfo.InvariantCulture, "{0}|{1}", _eventLogFilter.EventLog, _eventLogFilter.MD5Hash);
                if (configSettings[key] == null)
                {
                    configSettings.Add(key, lastEntry.Index.ToString(CultureInfo.InvariantCulture));
                }
                else
                {
                    configSettings[key].Value = lastEntry.Index.ToString(CultureInfo.InvariantCulture);
                }
                config.Save(ConfigurationSaveMode.Modified);//Error seems to happen here
            }
        }
    }