.Net FramWork 和Net Core3.1配置Log4.net

一，.NET FramWork 4.7.2

1.NuGet包下载log4.net

 2.添加配置文件配置（configSections必须放在configuration下第一个节点）

<configSections>
    <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="DEBUG" />
      <appender-ref ref="RollingFileTracer" />
    </root>
    <!-- Print only messages of level DEBUG or above in the packages -->
    <appender name="RollingFileTracer" type="log4net.Appender.RollingFileAppender,log4net">
       <!--存储到项目的bin/Debug/下的地址-->
      <param name="File" value="App_Data/Log/" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Composite" />
      <param name="MaxSizeRollBackups" value="10" />
      <param name="MaximumFileSize" value="1MB" />
      <!--文件名-->
      <param name="DatePattern" value=""Log_"yyyyMMdd".txt"" />
      <param name="StaticLogFileName" value="false" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
      </layout>
    </appender>
  </log4net>

 3.程序调用

private static ILog log = LogManager.GetLogger(typeof(Program));//typeof放当前类
        static void Main(string[] args)
        {
            // 这段代码要在程序运行的入口进行配置
            log4net.Config.XmlConfigurator.Configure();//需要配置这段代码，log4才能生效
 
            //log4net的简单使用
            log.Error("错误", new Exception("发生了一个异常"));//错误
            log.Fatal("严重错误", new Exception("发生了一个致命错误"));//严重错误
            log.Info("信息"); //记录一般信息
            log.Debug("调试信息");//记录调试信息
            log.Warn("警告");//记录警告信息
 
        }

 

二，ASP.NET Core MVC  (net core 3.1）

1.项目NuGet下载Microsoft.Extensions.Logging.Log4Net.AspNetCore

2.添加log4net配置文件

log4net.config内容（下面可复制）

​​​​​​​

"1.0" encoding="utf-8" ?>
 
 
<log4net>
  
  <root>
    
    <level value="ERROR"/>
    <level value="WARN"/>
    <level value="INFO"/>
    <level value="DEBUG"/>
    <appender-ref ref="ErrorLog" />
    <appender-ref ref="WarnLog" />
    <appender-ref ref="InfoLog" />
    <appender-ref ref="DebugLog" />
  root>
  
  <appender name="ErrorLog" type="log4net.Appender.RollingFileAppender">
    
    <param name="File" value="DataLog/File"/>
    
    <param name="DatePattern" value="/yyyy-MM-dd/"Error.log""/>
    
    <appendToFile value="true"/>
    
    <rollingStyle value="Composite"/>
    
    <staticLogFileName value="false"/>
    
    <maximumFileSize value="200MB"/>
    
    <maxSizeRollBackups value="-1"/>
    
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
    layout>
    <filter type="log4net.Filter.LevelRangeFilter">
      <param name="LevelMin" value="ERROR" />
      <param name="LevelMax" value="ERROR" />
    filter>
  appender>
 
  
  <appender name="WarnLog" type="log4net.Appender.RollingFileAppender">
    
    <param name="File" value="DataLog/File"/>
    
    <param name="DatePattern" value="/yyyy-MM-dd/"Warn.log""/>
    
    <appendToFile value="true"/>
    
    <rollingStyle value="Composite"/>
    
    <staticLogFileName value="false"/>
    
    <maximumFileSize value="200MB"/>
    
    <maxSizeRollBackups value="-1"/>
    
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
    layout>
    <filter type="log4net.Filter.LevelRangeFilter">
      <param name="LevelMin" value="WARN" />
      <param name="LevelMax" value="WARN" />
    filter>
  appender>
 
  
  <appender name="InfoLog" type="log4net.Appender.RollingFileAppender">
    
    <param name="File" value="DataLog/File"/>
    
    <param name="DatePattern" value="/yyyy-MM-dd/"Info.log""/>
    
    <appendToFile value="true"/>
    
    <rollingStyle value="Composite"/>
    
    <staticLogFileName value="false"/>
    
    <maximumFileSize value="200MB"/>
    
    <maxSizeRollBackups value="-1"/>
    
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
    layout>
    <filter type="log4net.Filter.LevelRangeFilter">
      <param name="LevelMin" value="INFO" />
      <param name="LevelMax" value="INFO" />
    filter>
  appender>
 
  
  <appender name="DebugLog" type="log4net.Appender.RollingFileAppender">
    
    <param name="File" value="DataLog/File"/>
    
    <param name="DatePattern" value="/yyyy-MM-dd/"Debug.log""/>
    
    <appendToFile value="true"/>
    
    <rollingStyle value="Composite"/>
    
    <staticLogFileName value="false"/>
    
    <maximumFileSize value="200MB"/>
    
    <maxSizeRollBackups value="-1"/>
    
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
    layout>
    <filter type="log4net.Filter.LevelRangeFilter">
      <param name="LevelMin" value="DEBUG" />
      <param name="LevelMax" value="DEBUG" />
    filter>
  appender>
log4net>

3.Startup类里更改一下Configure方法，添加参数 Microsoft.Extensions.Logging.ILoggerFactory loggerFactory，在方法体内加上loggerFactory.AddLog4Net()

 //如果你的配置文件放在某一个文件夹下loggerFactory.AddLog4Net("ConfigFile/log4net.Config")
 //如直接放项目下的就直接啥也不用填，会自己获取

 
Microsoft.Extensions.Logging.ILoggerFactory loggerFactory
 
loggerFactory.AddLog4Net();//指向日志配置文件   

 4.Program类添加一段代码(在下面可复制)

 //如果你的配置文件放在某一个文件夹下LogBuilder.AddLog4Net("ConfigFile/log4net.Config")
 //如直接放项目下的就直接啥也不用填，会自己获取

  .ConfigureLogging(LogBuilder =>
                {
                    LogBuilder.AddLog4Net();
                })

 

5.调用