C# log4net 的配置

1、新建Web或者Webform项目，使用Nuget下载log4net

2. 新建Config文件夹，将log4net配置文件放入此文件夹中（当修改web.config的时候会重启网站，所以把log4net单独出来比较好，也好管理）， log4net的配置文件log4net_config.xml

在app.config或者web.config中的configuration节点下加入：放在configSections中第一位

<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
</configSections>

CS：

在Properties下的AssemblyInfo.cs文件中加入

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

如果我们将log4net帮助类放在另一个公共的类库项目中，又需要在另一个引用的项目中使用log4helper类，

这时候仅需要在该项目里的Properties下的AssemblyInfo.cs文件中加入这句：

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

日志配置：

第一种：

<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <system.web>
    <compilation debug="false" targetFramework="4.6.1" />
    <httpRuntime targetFramework="4.6.1" />
  </system.web>

  <log4net>
    <appender name="fatalAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="FATAL" />
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <File value="Logsfatal.log" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="ERROR" />
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <File value="Logserr.log" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <appender name="warnAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="WARN" />
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <File value="Logswarn.log" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %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" />
      <File value="Logsinfo.log" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <appender name="debugAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="DEBUG" />
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <File value="Logsdebug.log" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <appender name="perfAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="INFO" />
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <File value="Logsperf.log" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date %logger - %message%newline" />
      </layout>
    </appender>
    <root>
      <level value="ALL" />
      <appender-ref ref="fatalAppender" />
      <appender-ref ref="errorAppender" />
      <appender-ref ref="warnAppender" />
      <appender-ref ref="infoAppender" />
      <appender-ref ref="debugAppender" />
    </root>
  </log4net>
  
</configuration>

View Code

第二种：可以放在configuration种

<log4net>
      <appender name="fatalAppender" type="log4net.Appender.RollingFileAppender">
        <filter type="log4net.Filter.LevelMatchFilter">
          <levelToMatch value="FATAL" />
        </filter>
        <filter type="log4net.Filter.DenyAllFilter" />
        <File value="LogsFatalfatal.log" />
        <appendToFile value="true" />
        <rollingStyle value="Date" />
        <datePattern value="yyyyMMdd" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
        </layout>
      </appender>
      <!-- 错误日志附加介质-->
      <appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
        <filter type="log4net.Filter.LevelMatchFilter">
          <levelToMatch value="ERROR" />
        </filter>
        <filter type="log4net.Filter.DenyAllFilter" />

        <param name="File" value="Log\" />
        <param name="AppendToFile" value="true" />
        <param name="MaxSizeRollBackups" value="100" />
        <param name="MaxFileSize" value="10240" />
        <param name="StaticLogFileName" value="false" />
        <param name="DatePattern" value="Error/yyyy-MM-dd/&quot;Error_&quot;yyyyMMdd&quot;.log&quot;"  />
        <param name="RollingStyle" value="Date" />

        <!-- 信息日志布局-->
        <layout type="log4net.Layout.PatternLayout">
          <!--<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />-->
          <param name="ConversionPattern" value="记录时间：%date 线程ID:[%thread] 日志级别：%-5level 记录类：%logger     操作者ID：%property{Operator} 操作类型：%property{Action}%n             当前机器名:%property%n当前机器名及登录用户：%username %n               记录位置：%location%n 消息描述：%property{Message}%n                    异常：%exception%n 消息：%message%newline%n%n" />
        </layout>
      </appender>
      <appender name="warnAppender" type="log4net.Appender.RollingFileAppender">
        <filter type="log4net.Filter.LevelMatchFilter">
          <levelToMatch value="WARN" />
        </filter>
        <filter type="log4net.Filter.DenyAllFilter" />
        <File value="LogsWarnwarn.log" />
        <appendToFile value="true" />
        <rollingStyle value="Date" />
        <datePattern value="yyyyMMdd" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%date [%thread] %-5level %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" />
        <File value="LogsInfoinfo.log" />
        <appendToFile value="true" />
        <rollingStyle value="Date" />
        <datePattern value="yyyyMMdd" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
        </layout>
      </appender>
      <appender name="debugAppender" type="log4net.Appender.RollingFileAppender">
        <filter type="log4net.Filter.LevelMatchFilter">
          <levelToMatch value="DEBUG" />
        </filter>
        <filter type="log4net.Filter.DenyAllFilter" />
        <File value="LogsDebugdebug.log" />
        <appendToFile value="true" />
        <rollingStyle value="Date" />
        <datePattern value="yyyyMMdd" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
        </layout>
      </appender>
      <appender name="perfAppender" type="log4net.Appender.RollingFileAppender">
        <filter type="log4net.Filter.LevelMatchFilter">
          <levelToMatch value="INFO" />
        </filter>
        <filter type="log4net.Filter.DenyAllFilter" />
        <File value="Logsperf.log" />
        <appendToFile value="true" />
        <rollingStyle value="Date" />
        <datePattern value="yyyyMMdd" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%date %logger - %message%newline" />
        </layout>
      </appender>
      <root>
        <level value="ALL" />
        <appender-ref ref="fatalAppender" />
        <appender-ref ref="errorAppender" />
        <appender-ref ref="warnAppender" />
        <appender-ref ref="infoAppender" />
        <appender-ref ref="debugAppender" />
      </root>
    </log4net>

View Code

第三个示例

  <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="DEBUG" />
    </logger>
    <appender name="SysAppender" type="log4net.Appender.RollingFileAppender,log4net">
      <param name="File" value="App_Data/" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="&quot;Logs_&quot;yyyyMMdd&quot;.txt&quot;" />
      <param name="StaticLogFileName" value="false" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
      </layout>
    </appender>
    <appender name="consoleApp" type="log4net.Appender.ConsoleAppender,log4net">
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
      </layout>
    </appender>
  </log4net>

View Code

3. 在项目中

log4net.ILog log = LogManager.GetLogger("log---"); //"log---" 会在日志文件中显示
        log4net.Config.XmlConfigurator.Configure(); //--这个执行一次就可以 log4net.config
        //配置log4--单独放一个文件中的
        //log4net.Config.XmlConfigurator.Configure(new System.IO.FileInfo(Server.MapPath("~/log4net.config")));
        log.Info(DateTime.Now + "  这是一个log4net提示日志");
        log.Error(DateTime.Now + "  log4net错误日志");

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4. 日志记录到数据库

<?xml version="1.0" encoding="utf-8" ?>  
  
<log4net debug="false">  
  <!-- name属性指定其名称,type则是log4net.Appender命名空间的一个类的名称,意思是,指定使用哪种介质-->  
  <appender name="ADONetAppender" type="log4net.Appender.ADONetAppender">  
    <!--日志缓存写入条数 设置为0时只要有一条就立刻写到数据库-->  
    <bufferSize value="0" />  
    <!--日志数据库连接串-->  
    <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />  
    <connectionString value="DATABASE=GoodLook;SERVER=xx.xx.140.170;UID=sa;PWD=123456a;Connect Timeout=30;" />  
    <!--日志数据库脚本-->  
    <commandText value="INSERT INTO LogDetails ([LogDate],[LogThread],[LogLevel],[LogLogger],[LogActionClick],[LogMessage],[UserName],[UserIP]) VALUES (@log_date, @thread, @log_level, @logger, @ActionsClick, @message,@UserName,@UserIP)" />  
    <!--日志时间LogDate -->  
     <parameter>  
      <parameterName value="@log_date" />  
      <dbType value="DateTime" />  
      <layout type="log4net.Layout.RawTimeStampLayout" />  
    </parameter>  
    <!--线程号-->  
    <parameter>  
      <parameterName value="@thread" />  
      <dbType value="String" />  
      <size value="100" />  
      <layout type="log4net.Layout.PatternLayout">  
        <conversionPattern value="%t" />  
      </layout>  
    </parameter>  
    <!--日志类型LogLevel -->  
    <parameter>  
      <parameterName value="@log_level" />  
      <dbType value="String" />  
      <size value="200" />  
      <layout type="log4net.Layout.PatternLayout">  
        <conversionPattern value="%p" />  
      </layout>  
    </parameter>  
    <!--日志名称-->  
    <parameter>  
      <parameterName value="@logger" />  
      <dbType value="String" />  
      <size value="500" />  
      <layout type="log4net.Layout.PatternLayout">  
        <conversionPattern value="%logger" />  
      </layout>  
    </parameter>  
    <parameter>  
      <parameterName value="@message" />  
      <dbType value="String" />  
      <size value="3000" />  
      <layout type="Log4NetApply.MyLayout">  
        <conversionPattern value="%property{Message}" />  
      </layout>  
    </parameter>  
    <parameter>  
      <parameterName value="@ActionsClick" />  
      <dbType value="String" />  
      <size value="4000" />  
        <layout type="Log4NetApply.MyLayout" >  
        <conversionPattern value = "%property{ActionsClick}"/>  
      </layout>  
    </parameter>  
    <!--自定义UserName -->  
    <parameter>    
        <parameterName value="@UserName" />    
        <dbType value="String" />    
        <size value="30" />  
      <layout type="Log4NetApply.MyLayout" >  
        <!--log4net.MDC.Set("UserName", "asdfasdf");  
        <conversionPattern value = "%X{UserName}"/>-->  
        <conversionPattern value = "%property{UserName}"/>  
      </layout>  
      </parameter>    
   <parameter>    
        <parameterName value="@UserIP" />    
        <dbType value="String" />    
        <size value="20" />  
        <layout type="Log4NetApply.MyLayout" >  
          <conversionPattern value = "%property{UserIP}"/>  
        </layout>  
      </parameter>    
  </appender>  
  <!-- setup the root category, add the appenders and set the default level -->  
  <root>  
    <level value="Warn"/><!-- 定义记录的日志级别-->  
    <level value="Info"/>  
    <level value="Debug"/>  
    <level value="Fine"/>  
    <appender-ref ref="ADONetAppender" /><!-- 记录到什么介质中-->  
  </root>  
  <!-- specify the level for some specific categories -->  
  <!--//关于上边root到logger这块，如果同时出现，有可能会出现重复插入记录的情况：-->  
  <!--<logger name="iNotes">  
    <level value="WARN"/>  
    <level value="INFO"/>  
    <level value="DEBUG"/>  
    <level value="FINE"/>  
    <appender-ref ref="ADONetAppender"/>  
  </logger>  
  <logger name="StellaLogger">  
    <level value="ALL"/>  
    <appender-ref ref="AdoNetAppender" />  
  </logger>-->  
  <appender name="ReflectionLayout" type="log4net.Appender.RollingFileAppender,log4net">  
  
    <!--日志文件路径,按文件大小方式输出时在这里指定文件名，并且前面的日志按天在文件名后自动添加当天日期形成文件-->  
    <param name="File" value="D:/Log/" />  
  
    <!--是否追加到文件-->  
    <param name="AppendToFile" value="true" />  
  
    <!--记录日志写入文件时，不锁定文本文件-->  
    <!--<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />-->  
  
    <!--Unicode编码-->  
    <!--<Encoding value="UTF-8" />-->  
  
    <!--最多产生的日志文件数，value="－1"为不限文件数-->  
    <!--<param name="MaxSizeRollBackups" value="10" />-->  
  
    <!--是否只写到一个文件中-->  
    <param name="StaticLogFileName" value="false" />  
  
    <!--按照何种方式产生多个日志文件(日期[Date],文件大小[Size],混合[Composite])-->  
    <param name="RollingStyle" value="Composite" />  
  
    <!--按日期产生文件夹，文件名［在日期方式与混合方式下使用］-->  
    <param name="DatePattern" value="yyyy-MM-dd/"ReflectionLayout.log""  />  
    <!--<param name="DatePattern" value="yyyyMMdd/yyyyMMdd"-TimerServer.log""  />-->  
    <!--<param name="DatePattern" value="yyyyMMdd/"TimerServer/TimerServer.log""  />-->  
  
    <!--每个文件的大小。只在混合方式与文件大小方式下使用，超出大小的在文件名后自动增加1重新命名-->  
    <param name="maximumFileSize" value="500KB" />  
  
    <!--记录的格式。-->  
    <layout type="TGLog.ExpandLayout2.ReflectionLayout,TGLog">  
      <param name="ConversionPattern" value="记录时间：%date 线程ID:[%thread] 日志级别：%-5level 记录类：%logger 操作者ID：%property{Operator} 操作类型：%property{Action}%n 当前机器名:%property%n当前机器名及登录用户：%username %n 记录位置：%location%n 消息描述：%property{Message}%n 异常：%exception%n 消息：%message%newline%n%n" />  
    </layout>  
  </appender>  
  
    
   
    
</log4net>

View Code

<bufferSize value="10" />,表示是记录10 条到缓冲区，满10条后再写入SQL server

调试时可以改为1，实际应用建议为100

         <root>  
            <level value="WARN"/>  
            <level value="INFO"/>  
            <level value="DEBUG"/>  
            <level value="FINE"/>  
            <appender-ref ref="ADONetAppender" />  
        </root>      
在需要记录的每个类中添加如下代码：
private static log4net.ILog myLogger = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

View Code

https://blog.csdn.net/kongwei521/article/details/52242319

https://www.cnblogs.com/daretodream/p/3509027.html

另外：可以找log4net帮助类

链接：https://www.cnblogs.com/weixiaowei/p/8253228.html

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原文地址：https://www.cnblogs.com/love201314/p/9089819.html