无法以编程方式配置log4net记录器

我需要配置一个log4net Logger 以编程方式。具体来说,我需要添加一个 一个附加物。然而,当我检索它时,我发现它没有正确的级别或appender,希望我错过了一些简单的配置:

        var patternLayout = new PatternLayout { ConversionPattern = "%message%newline" };
        patternLayout.ActivateOptions();

        var hierarchy = (Hierarchy)LogManager.GetRepository();

        var testAppender = new RollingFileAppender
        {
            Name = "test-appender",
            AppendToFile = true,
            File = "c:\\temp\\test.log",
            Layout = patternLayout,
            DatePattern = "yyyyMMdd-HHmm",
            MaxSizeRollBackups = 50,
            MaximumFileSize = "20MB",
            RollingStyle = RollingFileAppender.RollingMode.Size,
            StaticLogFileName = false,
            Encoding = Encoding.UTF8,
            PreserveLogFileNameExtension = true,
            Threshold = Level.Debug
        };

        testAppender.ActivateOptions();

        var testLogger = hierarchy.LoggerFactory.CreateLogger(hierarchy, "test");
        testLogger.Hierarchy = hierarchy;
        testLogger.AddAppender(testAppender);
        testLogger.Repository.Configured = true;
        testLogger.Level = Level.Debug;
        testLogger.Additivity = false;

        hierarchy.Configured = true;

        var testLogger = LogManager.GetLogger("test");