log4net的使用

第一步：Log4net的安装

Install-Package log4net

第二步：Log4net的配置

log4net.config

注意：将log4net.config的属性“复制到输出目录”设置为“始终复制”

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>

<log4net>
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<!--日志路径-->
<param name= "File" value= "D:\App_Log\"/>
<!--是否是向文件中追加日志-->
<param name= "AppendToFile" value= "true"/>
<!--log保留天数-->
<param name= "MaxSizeRollBackups" value= "10"/>
<!--日志文件名是否是固定不变的-->
<param name= "StaticLogFileName" value= "false"/>
<!--日志文件名格式为:2008-08-31.log-->
<param name= "DatePattern" value= "yyyy-MM-dd".log""/>
<!--日志根据日期滚动-->
<param name= "RollingStyle" value= "Date"/>
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n %loggername" />
</layout>
</appender>

<!-- 控制台前台显示日志 -->
<appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
<mapping>
<level value="ERROR" />
<foreColor value="Red, HighIntensity" />
</mapping>
<mapping>
<level value="Info" />
<foreColor value="Green" />
</mapping>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%n%date{HH:mm:ss,fff} [%-5level] %m" />
</layout>

<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="Info" />
<param name="LevelMax" value="Fatal" />
</filter>
</appender>

<root>
<!--(高) OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL (低) -->
<level value="all" />
<appender-ref ref="ColoredConsoleAppender"/>
<appender-ref ref="RollingLogFileAppender"/>
</root>
</log4net>
</configuration>

第三步：调用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

using log4net;
using log4net.Config;

namespace Log4net
{
class Program
{
static void Main(string[] args)
{
InitLog4Net();

var logger = LogManager.GetLogger(typeof(Program));

logger.Info("消息");
logger.Warn("警告");
logger.Error("异常");
logger.Fatal("错误");

Console.ReadLine();
}

private static void InitLog4Net()
{
var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "log4net.config");
XmlConfigurator.ConfigureAndWatch(logCfg);
}
}
}

深入理解Log4net的结构

log4net 有四种主要的组件，分别是Logger（记录器）, Repository（库）, Appender（附着器）以及 Layout（布局）.

外部Blog资源：http://www.cnblogs.com/dragon/archive/2005/03/24/124254.html