log4net 组件简易封装

using log4net;
using log4net.Appender;
using log4net.Config;
using log4net.Core;
using log4net.Layout;
using System;
using System.IO;
using System.Web;

namespace Utility
{
    /// <summary>
    /// 简单封装log4net基本功能
    /// 1 无论log4net.config文件是否存在，都可以正常使用log4net.dll记录日志
    /// 2 支持两种类型的logger：SystemLogger和DatabaseLogger，还可以添加更多的logger对象
    /// </summary>
    public class Logger
    {
        private static readonly Type declaringType = typeof(Logger);

        protected static ILog SystemLog
        {
            get;
            private set;
        }

        protected static ILog DatabaseLog
        {
            get;
            private set;
        }

        static Logger()
        {
            const string fileName = "log4net.config";
            string basePath = HttpContext.Current != null
                ? AppDomain.CurrentDomain.SetupInformation.PrivateBinPath
                : AppDomain.CurrentDomain.BaseDirectory;
            string filePath = Path.Combine(basePath, fileName);

            if (File.Exists(filePath))
            {
                XmlConfigurator.ConfigureAndWatch(new FileInfo(filePath));
            }
            else
            {
                //默认设置（log4net 按装饰器模式实现，支持：ConsoleLog、FileLog、EventLog等不同方式）
                RollingFileAppender appender = new RollingFileAppender
                {
                    Name = "root",
                    File = "logs\\log.txt",
                    AppendToFile = true,
                    RollingStyle = RollingFileAppender.RollingMode.Composite, //日期发生变化或日志文件大小超过10M，自动生成新的日志文件
                    DatePattern = "yyyyMMdd\".txt\"", //如果日期发了变化，自动保存历史日志文件，并生成新的日志文件
                    MaxSizeRollBackups = 5, //保留几个历史日志文件
                    Layout = new PatternLayout("[%d{yyyy-MM-dd HH:mm:ss.fff}] [%t] %-5level %logger property:[%property{NDC}] - %message%newline") //%m表示日志内容
                };

                BasicConfigurator.Configure(appender);
                appender.ActivateOptions();
            }

            //为log4net添加不同类型的参数logger，用于配置选择哪种方式输出日志
            SystemLog = LogManager.GetLogger("SystemLogger"); //返回或新建一个命名的logger对象
            DatabaseLog = LogManager.GetLogger("DatabaseLogger");
        }

        private static void WriteLog(ILog log, Level level, Exception exception, string message)
        {
            log.Logger.Log(declaringType, level, message, exception);
        }

        #region 装饰器>>系统日志

        public static void Debug(string message, Exception exception = null)
        {
            WriteLog(SystemLog, Level.Debug, exception, message);
        }

        public static void Info(string message, Exception exception = null)
        {
            WriteLog(SystemLog, Level.Info, exception, message);
        }

        public static void Warn(string message, Exception exception = null)
        {
            WriteLog(SystemLog, Level.Warn, exception, message);
        }

        public static void Error(string message, Exception exception = null)
        {
            WriteLog(SystemLog, Level.Error, exception, message);
        }

        public static void Fatal(string message, Exception exception = null)
        {
            WriteLog(SystemLog, Level.Fatal, exception, message);
        }

        #endregion

        #region 装饰器>>数据库日志       

        public static void DatabaseInfo(string message, Exception exception = null)
        {
            WriteLog(DatabaseLog, Level.Info, exception, message);
        }

        public static void DatabaseWarn(string message, Exception exception = null)
        {
            WriteLog(DatabaseLog, Level.Warn, exception, message);
        }

        public static void DatabaseError(string message, Exception exception = null)
        {
            WriteLog(DatabaseLog, Level.Error, exception, message);
        }

        #endregion
    }
}