log4net教程日志分类和自动维护示例

如果我们需要通过配置不同的ILog，流程是这样的，首先要创建一个ILoggerRepository，通过它来进行日志等级的配置，和各种Appender，接着通过LogManager在ILoggerRepository获取一个Ilog对象，就可以写日志了。代码如下:

代码如下:
public static ILog GetLogger(string repositoryName = "")
        {
            if (string.IsNullOrEmpty(repositoryName)) return LogManager.GetLogger("Defalut");

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

            //找到直接返回ilog
            if (repository != null)
                return LogManager.GetLogger(repositoryName, "Defalut");

            //未找到则创建，多线程下很有可能创建时，就存在了
            try
            {
                repository = LogManager.CreateRepository(repositoryName);
            }
            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)
            {