C#实现Log4Net日志分类和自动维护实例

    catch (Exception)
    {
 repository = LogManager.GetRepository(repositoryName);
    }

    //配置日志等级  读取Appsettings默认配置  
    var appSet = ConfigurationManager.AppSettings.AllKeys;

    //查找日志等级
    const string logLevel = "LogLevel";
    var hasSettings = Array.IndexOf(appSet, logLevel);
    if (hasSettings > -1)
    {
 var level = ConfigurationManager.AppSettings[logLevel].ToLower();
 if (level == "all") repository.Threshold = Level.All;
 else if (level == "debug") repository.Threshold = Level.Debug;
 else if (level == "info") repository.Threshold = Level.Info;
 else if (level == "warn") repository.Threshold = Level.Warn;
 else if (level == "error") repository.Threshold = Level.Error;
 else if (level == "fatal") repository.Threshold = Level.Fatal;
 else if (level == "off") repository.Threshold = Level.Off;
    }
    else repository.Threshold = Level.All;

    //查找输出Appender
    const string logAppender = "LogAppender";
    hasSettings = Array.IndexOf(appSet, logAppender);
    if (hasSettings > -1)
    {
 var appenders = ConfigurationManager.AppSettings[logAppender].ToLower().Split(',');
 foreach (var appender in appenders)
 {
     if (appender == "rollingfile") LoadRollingFileAppender(repository);
     else if (appender == "console") LoadConsoleAppender(repository);
     else if(appender == "trace") LoadTraceAppender(repository);
 }
    }
    else LoadRollingFileAppender(repository);

    return LogManager.GetLogger(repositoryName, "Default");
}

 

Log4net 会自动维护ILog和ILoggerRepository，所以不用保存，通过LogManger获取即可。但是我没有找到方法来查找指定的ILoggerRepository是否存在，所以在上述代码中通过try catch进行判断。由于我们是通过代码方式配置log4net，但仍旧希望通过配置来设置日志等级和输出类型，所以我选择在Appsettings文件中进行配置，一次配置，针对所有的ILoggerRepository都生效。之所以不是针对每一个功能进行配置，主要是由于配置麻烦，而且如果真要这么做，直接在log4net中配置不同的logger，通过loggername引用，可能会更好些。