log4net 纯代码配置

当需要输出的日志很多的时候，每次修改config都很麻烦，于是想可不可以动态生成。

网上找的案例都是获取单个appender/logger的，此处例子是任意logger，appender相同

log4net的pattern里面关于线程的显示规则是，有线程名用名字，无线程名用线程号。Nlog 可以分别指定

例子如下

        public static ILog GetLoggerByName(string name)
        {
            if (LogManager.Exists(name) == null)
            {

                // Pattern Layout defined
                PatternLayout patternLayout = new PatternLayout();
                patternLayout.ConversionPattern = "%date %thread %level %logger - %message%newline";
                patternLayout.ActivateOptions();

                // configurating the RollingFileAppender object
                RollingFileAppender appender = new RollingFileAppender();
                appender.Name = name;                
                appender.AppendToFile = true;
                appender.File = $"Log\{name}.log";
                appender.StaticLogFileName = true;
                appender.PreserveLogFileNameExtension = true;
                appender.LockingModel = new FileAppender.MinimalLock();
                appender.Layout = patternLayout;
                appender.MaxSizeRollBackups = 512;
                appender.MaximumFileSize = "150MB";
                appender.RollingStyle = RollingFileAppender.RollingMode.Composite;
                appender.ActivateOptions();

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

                var loger = hierarchy.GetLogger(name, hierarchy.LoggerFactory); //!!! 此处写法是重点，不容更改
                loger.Hierarchy = hierarchy;
                loger.AddAppender(appender);
                loger.Level = Level.All;
                
                BasicConfigurator.Configure();//!!! 此处写法是重点，不容更改

                var appname = Assembly.GetEntryAssembly().GetName().Name;
                var version= Assembly.GetEntryAssembly().GetName().Version;
                loger.Log(Level.Info, $"Log name {name} created for Application: {appname} Version: {version}", null);                
            }
            var log = LogManager.GetLogger(name);
            return log;
        }

       public static void SetMinLogLevel(Level level,string name="")
        {
            if(string.IsNullOrEmpty(name))
            {
                Hierarchy hierarchy = (Hierarchy)LogManager.GetRepository();
                hierarchy.Threshold = level;
            }
            else
            {
                Hierarchy hierarchy = (Hierarchy)LogManager.GetRepository();
                if(hierarchy.Exists(name) is Logger loger)
                {
                    loger.Level = level;
                }
            }
        }