log4net的配置详解

log4net是Apache的C#日志系统，下面是详细配置：

一，用Nuget安装log4net：

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二，修改App.config文件，添加配置项，下面是完整的配置文件内容：

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<?xml version="1.0" encoding="utf-8" ?> <configuration>     <configSections>         <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />     </configSections>     <startup>         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />     </startup>     <log4net>         <logger name="logerror">             <level value="ERROR" />             <appender-ref ref="ErrorAppender" />         </logger>         <logger name="loginfo">             <level value="INFO" />             <appender-ref ref="InfoAppender" />         </logger>         <appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">             <param name="File" value="Log\\LogError\\" />             <param name="AppendToFile" value="true" />             <param name="MaxSizeRollBackups" value="100" />             <param name="MaxFileSize" value="10240" />             <param name="StaticLogFileName" value="false" />             <datePattern value="yyyyMM\\yyyyMMdd'_Demo.txt'" />             <param name="RollingStyle" value="Date" />             <layout type="log4net.Layout.PatternLayout">                 <param name="ConversionPattern" value="%n异常时间：%d %n异常级别：%-5p%n异常内容：%m%n" />             </layout>             <!--< > = <> %n = 回车-->         </appender>         <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">             <param name="File" value="Log\\LogInfo\\" />             <param name="AppendToFile" value="true" />             <param name="MaxFileSize" value="10240" />             <param name="MaxSizeRollBackups" value="100" />             <param name="StaticLogFileName" value="false" />             <datePattern value="yyyyMM\\yyyyMMdd'_Demo.txt'" />             <param name="RollingStyle" value="Date" />             <layout type="log4net.Layout.PatternLayout">                 <param name="ConversionPattern" value="日志时间：%d %n日志级别：%-5p  %n日志内容：%m%n%n" />             </layout>         </appender>     </log4net> </configuration>

注意：这个配置项必须加入，而且必须放到第一个位置，否则会报错！

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

 三，在AssemblyInfo.cs文件中注册，在文件末尾加入：

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1 2	//为项目注册Log4Net.config配置文件 [assembly: log4net.Config.XmlConfigurator(ConfigFileExtension = "config", Watch = true)]

四，工程里面创建日志类，就可以使用了：

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public class LogHelper {     private LogHelper()     {       }       public static readonly log4net.ILog loginfo = log4net.LogManager.GetLogger("loginfo");       public static readonly log4net.ILog logerror = log4net.LogManager.GetLogger("logerror");       public static void SetConfig()     {         log4net.Config.XmlConfigurator.Configure();     }       public static void SetConfig(FileInfo configFile)     {         log4net.Config.XmlConfigurator.Configure(configFile);     }       public static void WriteLog(string info)     {         if (loginfo.IsInfoEnabled)         {             loginfo.Info(info);         }     }       public static void WriteLog(string info, Exception se)     {         if (logerror.IsErrorEnabled)         {             logerror.Error(info, se);         }     } }

参考：

https://www.cnblogs.com/Liyuting/p/8417757.html

https://blog.csdn.net/m0_46378049/article/details/115000379