说起来log4net，我一直都知道这个的存在，但实际在项目中还真是没有去自己写过的那，这一次我在项目完成后并没有着急下一个项目的开始，于是突然想起来是否添加一个日志的编写，于是开始了log4net的总结，下面就简单的总结一下自己在添加log4net时间注意的。
1.首先我们在添加log4net之前需要添加其引用，这里就通过在web网站的引用添加其nuget包引用来添加，如下所示：
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" alt="" />
添加引用完成后，我们打开web网站引用即可看到存在log4net，这就意味着我们已经添加log4net引用成功。
2.下面我们就打开web网站的Properties文件夹下的AssemblyInfo.cs类文件，然后添加文件的配置：
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log.config", Watch = true)]
3.ConfigFile是指定log4net使用.config文件来读取配置信息，这里我新创建了一个config文件，专业用来配置log4net。也可以将其配置在web.config文件中，在log.config中，将其log4net文件配置在<configuration>节点中.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web> <log4net>
<!--定义输出到文件中-->
<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
<!--定义文件存放位置-->
<file value="~logs/"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<datePattern value="yyyy-MM-dd.txt"/>
<staticLogFileName value="false"/>
<layout type="log4net.Layout.PatternLayout">
<!--每条日志末尾的文字说明-->
<footer value="" />
<!--value类型："记录时间：%date 线程ID:[%thread] 日志级别：%-5level 出错类：%logger property:[%property{NDC}] - 错误描述：%message%newline"-->
<conversionPattern value="%date ThreadID:[%thread] Log Level:%-5level Class:%logger Desp:%message%newline"/>
</layout>
</appender> <!--定义文件输出的名字以及文件的类型-->
<appender name="ErrorLogFileAppender" type="log4net.Appender.RollingFileAppender">
<!--定义文件存放的位置-->
<file type="log4net.Util.PatternString" value="..\log\%date{yyyyMMdd}\JOB_%property{jobid}_%date{yyyyMMdd}.log" />
<!--默认为true。当文件存在时，是否在原文件上追加内容,可是True/false，-->
<appendToFile value="true" />
<!--默认为true。为true时，RollingStyler的date值将无效。且为true时，需要在file里指定文件名，所有日志都会记录在这个文件里，false时间是相反的-->
<StaticLogFileName value="true"/>
<!--文件锁类型，RollingFileAppender本身并不是线程安全的，如果在程序中没有进行线程安全的限制，可以在这里进行配置，确保写入时的安全；文件锁定的模式有三个：
FileAppender.ExclusiveLock, FileAppender.MinimalLock and FileAppender.InterProcessLock，默认是第一个值，排他锁定，一次值能有一个进程访问文件，关闭后
另外一个进程才可以访问；第二个是最小锁定模式，允许多个进程可以同时写入一个文件；-->
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" /> <layout type="log4net.Layout.PatternLayout">
<!--value类型："记录时间：%date 线程ID:[%thread] 日志级别：%-5level 出错类：%logger property:[%property{NDC}] - 错误描述：%message%newline"-->
<conversionPattern value="%date{yyyy/MM/dd HH:mm:ss} %message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="INFO" />
<levelMax value="ERROR" />
</filter>
</appender>
<root>
<!--控制级别，由低到高: ALL|DEBUG|INFO|WARN|ERROR|FATAL|OFF-->
<!--如果定义级别为INFO，则INFO级别向下的级别，例如DEBUG日志将不会被记录-->
<!--如果没有定义LEVEL的值，则缺省为DEBUG-->
<level value="INFO" />
<appender-ref ref="ErrorLogFileAppender"/>
</root>
</log4net>
</configuration>
针对filter我也是感觉好奇，于是查找了一些资料，看到友友的总结，我还是拿来用一下，希望下次我在写log4net时间能够更快的寻找的到的啦，嘿嘿，下面就针对filter来总结一下，如下所示：
<!--log4net里面的filter类常用的为：
、DenyAllFilter
拒绝所用的日志输出-->
<filter type="log4net.Filter.LevelMatchFilter">
<param name="LevelToMatch" value="DEBUG" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<!--上面的配置是如果日志的输出级别不符合DEBUG要求的话，则不输出任何日志。 、LevelMatchFilter
这个类里面有两个属性，一个是LevelToMatch这个属性,是要匹配输出日志的级别，例如：-->
<filter type="log4net.Filter.LevelMatchFilter">
<param name="LevelToMatch" value="DEBUG" />
</filter>
<!--这样的话，只有级别是DEBUG的日志才能输出。 另外这个类还有一个重要的属性就是AcceptOnMatch这个属性是设置如果这个条件匹配的话，是否接受输出打印，比如说：-->
<filter type="log4net.Filter.LevelMatchFilter">
<param name="LevelToMatch" value="DEBUG" />
</filter>
<filter type="log4net.Filter.StringMatchFilter">
<param name="StringToMatch" value="debug" />
</filter> <!--如果日志的级别为DEBVG的话，也就是说符合了第一个Filter的条件，日志就输出，则StringMatchFilter就不执行了。如果这样写的话，就会继续向下执行过滤：-->
<filter type="log4net.Filter.LevelMatchFilter">
<param name="LevelToMatch" value="DEBUG" />
<AcceptOnMatch value="false"></AcceptOnMatch>
</filter>
<filter type="log4net.Filter.StringMatchFilter">
<param name="StringToMatch" value="debug" />
</filter>
<!--如果这样写的话，即使第一个Filter符合了条件则第二个Filter也会继续执行。 、LevelRangeFilter
配置文件是这样的：-->
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="DEBUG" />
<param name="LevelMax" value="ERROR" />
</filter> <!--、LoggerMatchFilter
配置文件是这样的：-->
<filter type="log4net.Filter.LoggerMatchFilter">
<param name="LoggerToMatch" value="Client" />
</filter> <!--、StringMatchFilter
配置文件是这样的：-->
<filter type="log4net.Filter.StringMatchFilter">
<param name="StringToMatch" value="/blog/Client.Program" />
</filter>
4.日志的配置文件已经写好，下面我们就去Global.asax文件中进行配置，如下所示：
ILog log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
在Global.asax文件Application_Start方法下添加I上面的代码块即可。
5.我们在容易出错的类中添加我们的报错信息，例如简单的报错ex错误，如下：
try
{
}
catch (System.Exception ex)
{
LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType).Error(ex.Message);
}
好啦，这样我们在出错时间就会创建log日志，然后告诉我们问题在哪里，嘿嘿，就总结到这里啦，加油亲们！