通过代码实现log4net自定义配置

大家在使用log4net的时候，常规的用法都是在配置文件里面进行设置。但是配置文件里面的配置项非常多，不利于记忆，所以说我们希望他能直接在代码中设置。

于是，我写了个自定义日志配置的方法，核心的配置对象为RollingFileAppender,只需要对他进行设置就可以了。

下面给大家展示下，基于使用场景下的日志服务示例。

public class LogService
    {
        private static readonly ConcurrentDictionary<string, ILog> _loggerContainer = new ConcurrentDictionary<string, ILog>();

        public const string Logger_Key_Default = "default";
        public const string Logger_Key_Crash = "crash";

        static LogService()
        {
            //初始化默认的日志服务
            GetOrAddLogger(Logger_Key_Default, new LoggerConfiguration().SetDefaultValue(Logger_Key_Default));
            GetOrAddLogger(Logger_Key_Crash, new LoggerConfiguration().SetDefaultValue(Logger_Key_Crash));
        }

        /// <summary>
        /// 日志统一处理事件
        /// </summary>
        /// <param name="action"></param>
        protected static void DoLog(Action action)
        {
            SingleThreadPool.Default.Post(() =>
            {
                action();
            });
        }

        private static ILog GetOrAddLogger(string key, LoggerConfiguration loggerConfiguration)
        {
            return _loggerContainer.GetOrAdd(key, new Func<string, ILog>((pKey) =>
            {
                var loggerName = loggerConfiguration.GetFileNameFunc();
                Hierarchy repository = (Hierarchy)LogManager.GetRepository();
                Logger logger = repository.LoggerFactory.CreateLogger(repository, loggerName);
                logger.Hierarchy = repository;
                logger.Parent = repository.Root;
                logger.Level = loggerConfiguration.LogLevel;
                logger.Additivity = false;
                logger.AddAppender(GetFileAppender(loggerConfiguration));
                logger.Repository.Configured = true;
                return new LogImpl(logger);
            }));
        }

        private static ILog GetLoggerFromKey(string key)
        {
            if (_loggerContainer.ContainsKey(key))
            {
                return _loggerContainer[key];
            }
            return default(ILog);
        }

        private static RollingFileAppender GetFileAppender(LoggerConfiguration logConfiguration)
        {
            var appender = new RollingFileAppender
            {
                LockingModel = new FileAppender.MinimalLock(),
                Name = "RollingFileAppender",
                File = logConfiguration.SavePath,
                AppendToFile = true,
                MaxSizeRollBackups = logConfiguration.MaxSizeRollBackUps,
                MaximumFileSize = logConfiguration.MaximumFileSize,
                StaticLogFileName = true,
                RollingStyle = RollingFileAppender.RollingMode.Size,
                DatePattern = logConfiguration.DatePattern
            };
            PatternLayout layout = new PatternLayout(logConfiguration.LayoutPattern);
            appender.Layout = layout;
            layout.ActivateOptions();
            appender.ActivateOptions();
            return appender;
        }

        #region 公开事件

        public static void Warn(object msg, Exception ex = null)
        {
            DoLog(() =>
            {
                GetLoggerFromKey(Logger_Key_Default)?.Warn(msg, ex);
            });
        }

        public static void Info(object msg, Exception ex = null)
        {
            DoLog(() =>
            {
                GetLoggerFromKey(Logger_Key_Default)?.Info(msg, ex);
            });
        }

        public static void Debug(object msg, Exception ex = null)
        {
            DoLog(() =>
            {
                GetLoggerFromKey(Logger_Key_Default)?.Debug(msg, ex);
            });
        }

        public static void Error(object msg, Exception ex = null)
        {
            DoLog(() =>
            {
                GetLoggerFromKey(Logger_Key_Default)?.Error(msg, ex);
            });
        }

        public static void Crash(object msg, Exception ex = null)
        {
            DoLog(() =>
            {
                GetLoggerFromKey(Logger_Key_Crash)?.Error(msg, ex);
            });
        }

        #endregion
    }

    public class LoggerConfiguration
    {
        public LoggerConfiguration SetDefaultValue(string key)
        {
            LayoutPattern = "%date% %message%newline";
            DatePattern = "yyyyMMdd";
            MaxSizeRollBackUps = 20;
            MaximumFileSize = "50MB";
            LogLevel = Level.All;
            GetFileNameFunc = new Func<string>(() =>
             {
                 return $"{key}_{Process.GetCurrentProcess().ProcessName}_{Process.GetCurrentProcess().Id}_{DateTime.Now.ToString("yyyyMMdd")}.log";
             });
            SavePath = $"{CoreValue.Instance.MizPCTempFilePath}/log/{GetFileNameFunc()}";
            return this;
        }

        public string LayoutPattern { get; set; }

        public string DatePattern { get; set; }

        public int MaxSizeRollBackUps { get; set; }

        public string MaximumFileSize { get; set; }

        public Level LogLevel { get; set; }

        public string SavePath { get; set; }

        public Func<string> GetFileNameFunc { get; set; }
    }

这样就可以了。