【转发】MVC Log4net

1.引用log4net库类

2.写配置，我一般是写在web.config

<configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
  </configSections>
  <log4net debug="true">
    <appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="ERROR" />
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <!--日志文件名开头-->
      <file value="..\\Logs\\Error\\" />
      <!--是否追加到文件-->
      <appendToFile value="true" />
      <!--混合使用日期和文件大小变换日志文件名-->
      <rollingStyle value="Composite" />
      <!--最大变换数量-->
      <maxSizeRollBackups value=""/>
      <!--最大文件大小-->
      <maximumFileSize value="500KB"/>
      <!--日期的格式-->
      <staticLogFileName value="false" />
      <datePattern value="yyyyMMdd".log"" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date  %logger : %message%newline" />
      </layout>
    </appender>
    <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="INFO" />
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <!--日志文件名开头-->
      <file value="..\\Logs\\Info\\" />
      <!--是否追加到文件-->
      <appendToFile value="true" />
      <!--混合使用日期和文件大小变换日志文件名-->
      <rollingStyle value="Composite" />
      <!--最大变换数量-->
      <maxSizeRollBackups value=""/>
      <!--最大文件大小-->
      <maximumFileSize value="500KB"/>
      <!--日期的格式-->
      <staticLogFileName value="false" />
      <datePattern value="yyyyMMdd".log"" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date  %logger : %message%newline" />
      </layout>
    </appender>
    <root>
      <level value="All" />
      <appender-ref ref="ErrorAppender" />
      <appender-ref ref="InfoAppender" />
    </root>
  </log4net>

3.在项目的AssemblyInfo最后加上[

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Web.config", Watch = true)]

4.在Application_Start()中加上

 string l4net = Server.MapPath("~/Web.config");
log4net.Config.XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo(l4net));