Log4Net的使用

开源日志记录组件Log4Net的使用

1、在项目中引入Log4Net程序集

2、在项目配置文件中添加Log4Net配置节

　　Log4Net的基本配置

<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <!--Log4Net配置-->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/><!--Log4Net配置由Log4NetConfigurationSectionHandler节处理-->
  </configSections>
  <log4net>
    <!-- Define some output appenders -->
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"><!--设置以滚动文件形式记录日志-->
      <file value="test.txt"/><!--日志形成的文本名称-->
      <appendToFile value="true"/><!--文件追加-->
      <maxSizeRollBackups value="10"/><!--最多形成10个日志文件-->
      <maximumFileSize value="1024KB"/><!--每个日志文件大小为1024KB-->
      <rollingStyle value="Size"/><!--日志文件以文件大小生成，一个日志文件到1024KB之后形成下一个-->
      <staticLogFileName value="true"/><!--日志文件名固定死的-->
      <layout type="log4net.Layout.PatternLayout"><!--日志文本显示格式-->
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
      </layout>
    </appender>
    <root>
      <level value="DEBUG"/><!--等级-->
      <appender-ref ref="RollingLogFileAppender"/>
    </root>
  </log4net>
  <!--Log4Net配置结束-->
</configuration>

　　Log4Net专业配置（当前项目.Net MVC）

<configuration>
  <configSections>
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <!--Log4Net配置-->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>

  <log4net>
    <!-- OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL -->
    <!-- Set root logger level to ERROR and its appenders -->
    <root>
      <level value="ALL"/>
      <appender-ref ref="SysAppender"/>
    </root>

    <!-- Print only messages of level DEBUG or above in the packages -->
    <logger name="WebLogger">
      <level value="ERROR"/>
    </logger>

    <appender name="SysAppender" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" value="App_Data/" /><!--将日志文件放在App_Data下，客户端通过浏览器地址不能直接打开，增加了安全性-->
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="&quot;Logs_&quot;yyyyMMdd&quot;.txt&quot;" /><!--日志文件名以日期天数为名称-->
      <param name="StaticLogFileName" value="false" /><!--不起用静态命名方式-->
      <layout type="log4net.Layout.PatternLayout,log4net"><!--格式-->
        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
        <param name="Header" value="&#13;&#10;----------------------header--------------------------&#13;&#10;" />
        <param name="Footer" value="&#13;&#10;----------------------footer--------------------------&#13;&#10;" />
      </layout>
    </appender>
    <appender name="consoleApp" type="log4net.Appender.ConsoleAppender,log4net"><!--异常信息-->
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
      </layout>
    </appender>
  </log4net>
  <!--Log4Net配置结束-->
</configuration>

3、在应用程序开始处Application_Start()方法中写 log4net.Config.XmlConfigurator.Configure();读取Log4Net配置信息

通过Log4Net将异常信息写到磁盘上记录日志

protected void Application_Start()
        {
            log4net.Config.XmlConfigurator.Configure();//读取Log4Net配置信息
            AreaRegistration.RegisterAllAreas();

            WebApiConfig.Register(GlobalConfiguration.Configuration);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);

            string fileLogPath = Server.MapPath("/Log/");
           
            ThreadPool.QueueUserWorkItem((a) =>
            {
                while (true)
                {
                    if (MyExceptionAttribute.ExceptionQueue.Count > 0)
                    {
                       Exception ex= MyExceptionAttribute.ExceptionQueue.Dequeue();
                       ILog logger = LogManager.GetLogger("errorMsg");//Log4Net创建异常信息
                       logger.Error(ex.ToString());//将异常信息写到磁盘上
                    }
                    else
                    {
                        Thread.Sleep(3000);
                    }
                }


            },fileLogPath);
        }

4、日志文件