以下配置了二种写文件，第一种根据日期写文件yyyyMMdd.txt，第二种是写固定文件login.txt。

1， 下载Log4net组件：

http://logging.apache.org/log4net/download.html

2，将log4net.dll加到项目引用中；

 

3，在app.config中添加相关配置信息，文件内容如下：

   <?xml version="1.0"?>

<configuration>

  <configSections>

    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">

      <section name="ChinaBank.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>

    </sectionGroup>

    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net-net-1.0"/>

  </configSections>

  <log4net>

    <logger name="Daily.Logging">

      <level value="INFO"/>

      <appender-ref ref="DailyAppender" />

    </logger>

    <logger name="Login.Logging">

      <level value="INFO"/>

      <appender-ref ref="LoginAppender" />

    </logger>

    <appender name="DailyAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyyMMdd.'txt'" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%m%n" />

      </layout>

    </appender>

    <appender name="LoginAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/login.txt" />

      <param name="AppendToFile" value="true" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d|%m|%n" />

      </layout>

    </appender>

  </log4net>

<!--这里为appSettings等其它节点信息-->

</configuration>

 

 

4，在AssemblyInfo.cs最下面添加(其中XXXXX.exe.config为app.config在bin\Debug中生成的文件名，以实际为准)：

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "./XXXXX.exe.config", ConfigFileExtension = "config", Watch = true)]

 

5，在项目中使用Log4net：

//根据日期写文件yyyyMMdd.txt

log4net.ILog log = log4net.LogManager.GetLogger("Daily.Logging");  

log.Info("这是一条普通信息");    

//写固定文件login.txt

log4net.ILog log2 = log4net.LogManager.GetLogger("Login.Logging");

log2.Info("用户张三登录");