Question

我正在使用NLog创建一个日志库，并且需要根据不同的终端设置记录器。我所做的是创建一个ILoggerFacade实现，并将文件名作为构造函数传递，并使用用于创建日志文件的文件名注入。

这是我的代码：

internal static class FileLogFactory
{
    #region "Private Static Members"

    private static ILog _applicationLog;
    private static Dictionary<string, ILog> _terminalLogs;
    private static object _syncLock = new object();

    #endregion

    #region "Constant Fields"

    private const string _APPLICATION_LOG = "applicationLog";
    private const string _TERMINAL_LOG = "terminalHandlerLog";
    private const string _TERMINAL_PREFIX = "filenameprefix";

    public const string APPLICATION = "Application";

    #endregion

    #region "Static Cosntructors"

    static FileLogFactory()
    {
        _terminalLogs = new Dictionary<string, ILog>();
    } 

    #endregion

    #region "Static Methods"

    internal static ILog CreateLoggerInstance(string filename)
    {
        lock (_syncLock)
        {
            if (string.IsNullOrEmpty(filename) || filename == APPLICATION)
            {
                // Application Log requested.
                if (_applicationLog == null)
                {
                    _applicationLog = LogManager.GetLogger(_APPLICATION_LOG);
                }

                return _applicationLog;
            }

            // terminal log requested, check if already created else create new.
            if (!_terminalLogs.ContainsKey(filename))
            {
                NLog.GlobalDiagnosticsContext.Set(_TERMINAL_PREFIX, filename);
                _terminalLogs.Add(filename, LogManager.GetLogger(_TERMINAL_LOG));
            }

            return _terminalLogs[filename];
        }
    } 

    #endregion
}

以下是我的NLog配置

＆＃13;

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <!-- 
  See https://github.com/nlog/nlog/wiki/Configuration-file 
  for information on customizing logging rules and outputs.
   -->
  <variable name="logpath" value="c:/Log"/>
  <targets>
    <!-- add your targets here -->
    
     <target xsi:type="File" 
             name="applicationTarget"
             layout="${longdate}|${uppercase:${level}}|${threadid}| ${message}"
             archiveAboveSize="1024000"
             fileName="${logpath}/Application.${shortdate}.log"
             />

    <target xsi:type="File"
            name="terminalHandlerTarget"
            layout="${longdate}|${uppercase:${level}}|${threadid}| ${message}"
            archiveAboveSize="1024000"
            fileName="${logpath}/${gdc:item=filenameprefix}.${shortdate}.log"/>
    
  </targets>

  <rules>
    <!-- add your logging rules here -->
    <logger name="applicationLog" minlevel="Trace" writeTo="applicationTarget" />
    <logger name="terminalHandlerLog" minlevel="Trace" writeTo="terminalHandlerTarget" />
  </rules>
</nlog>

＆＃13;

想法是从代码传递gdc：item = filenameprefix并为每个终端创建日志文件。现在发生的事情是GetLogger返回相同的对象terminalHandlerLog，因此给出的最后一个文件名采用首选项，并从那里始终写入该文件。

我相信这是因为GetLogger遵循单例模式并为每个记录器创建单个对象。

如何覆盖，是否有可用于此的设置？

Answer 1

在NLog上使用GetLogger方法时，您将获得在配置中配置的实例。如果您需要多个配置，例如写入运行时已知的不同文件，则需要在代码中创建日志实例：

if (!_terminalLogs.ContainsKey(filename))
{
    var config = LogManager.Configuration;
    var fileTarget = new FileTarget();
    fileTarget.FileName = filename;
    fileTarget.Layout = "${longdate}|${uppercase:${level}}|${threadid}| ${message}";
    fileTarget.ArchiveAboveSize = 1024000;

然后将记录器添加到您的收藏夹中：

    _terminalLogs.Add(filename, _fileTarget);
    config.AddTarget(filename, fileTarget);
}

NLog实例问题

1 个答案: