log4net:动态创建记录器,我应该担心什么吗?

时间:2010-04-15 19:00:18

标签: c# .net logging log4net

我需要动态创建记录器,所以使用帖子from here和反射器的帮助我已经设法动态创建记录器,但我想知道我是否应该担心别的......我不知道具有什么影响可以做到。

    public static ILog GetDyamicLogger(Guid applicationId)
    {
        Hierarchy hierarchy = (Hierarchy)LogManager.GetRepository();
        RollingFileAppender roller = new RollingFileAppender();
        roller.LockingModel = new log4net.Appender.FileAppender.MinimalLock();
        roller.AppendToFile = true;
        roller.RollingStyle = RollingFileAppender.RollingMode.Composite;
        roller.MaxSizeRollBackups = 14;
        roller.MaximumFileSize = "15000KB";
        roller.DatePattern = "yyyyMMdd";
        roller.Layout = new log4net.Layout.PatternLayout();
        roller.File = "App_Data\\Logs\\"+applicationId.ToString()+"\\debug.log";
        roller.StaticLogFileName = true;

        PatternLayout patternLayout = new PatternLayout();
        patternLayout.ConversionPattern = "%date [%thread] %-5level %logger [%property{NDC}] - %message%newline";
        patternLayout.ActivateOptions();

        roller.Layout = patternLayout;
        roller.ActivateOptions();
        hierarchy.Root.AddAppender(roller);

        hierarchy.Root.Level = Level.All;
        hierarchy.Configured = true;

        DummyLogger dummyILogger = new DummyLogger(applicationId.ToString());
        dummyILogger.Hierarchy = hierarchy;
        dummyILogger.Level = log4net.Core.Level.All;
        dummyILogger.AddAppender(roller);

        return new LogImpl(dummyILogger);
    }

    internal sealed class DummyLogger : Logger
    {
        // Methods
        internal DummyLogger(string name)
            : base(name)
        {
        }
    }

干杯。

2 个答案:

答案 0 :(得分:2)

我想说你不必担心在代码中创建记录器。这是创建它们的受支持方法之一。在应用程序运行时,您确实无法更改内容(除非您为其编写代码)。这只是使用配置文件的好处之一。

答案 1 :(得分:0)

我注意到的一件事是,以这种方式创建的记录器未“正确地”输入到日志层次结构中(LogManager.GetLogger不会返回它)。但是,如果我这样使用 dummyILogger.Hierarchy = hierarchy;而不是hierarchy.GetLogger(string ILoggerFactory),那么它可以解决此问题:

    //End of the GetDyamicLogger function
    hierarchy.GetLogger(loggerName, new DynamicLoggerFactory(loggerName, dummyILogger));
    return new LogImpl(dummyILogger);
}

/// <summary>
/// Dummy <c>ILoggerFactory</c> implementation used by <c>Hierarchy.GetLogger</c>.
/// </summary>
internal sealed class DynamicLoggerFactory : ILoggerFactory
{
    private readonly string name;
    private readonly Logger logger;
    public DynamicLoggerFactory(string name, Logger logger) { this.name=name; this.logger=logger; }
    
    public Logger CreateLogger(log4net.Repository.ILoggerRepository repository, string name)
    {
        if(name != this.name) { throw new ArgumentOutOfRangeException("name", name, "Unexpected logger name queried."); }
        return this.logger;
    }
}

有了这个,LogManager.GetLogger将返回动态创建的记录器。