.Net Core 下使用Log4Net-优快云博客

本文链接：https://blog.youkuaiyun.com/u014518337/article/details/87723493

本文详细介绍了如何使用log4net进行日志记录配置，包括错误、信息、调试、警告和致命级别的日志文件设置，以及如何在代码中调用log4net进行日志记录。

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首先使用Nuget 获取log4net 程序集。

添加配置文件 log4net.config 内容如下：

<?xml version="1.0" encoding="utf-8" ?>
<log4net>

  <!--error-->
  <appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
    <filter type="log4net.Filter.LevelMatchFilter">
      <levelToMatch value="ERROR" />
    </filter>
    <filter type="log4net.Filter.DenyAllFilter" />
    <file value="Logs/err.log" />
    <encoding value="utf-8"/>
    <preserveLogFileNameExtension value="true" />
    <appendToFile value="true" />
     <rollingStyle value="Composite" /> 
    <maxSizeRollBackups value="10"/>
    <maximumFileSize value="10MB"/>
    <datePattern value="yyyyMMdd" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] - %message%newline" />
    </layout>
  </appender>

  <!--info-->
  <appender name="infoAppender" type="log4net.Appender.RollingFileAppender">
    <filter type="log4net.Filter.LevelMatchFilter">
      <levelToMatch value="INFO" />
    </filter>
    <filter type="log4net.Filter.DenyAllFilter" />
    <file value="Logs/info.log" />
    <encoding value="utf-8"/>
    <preserveLogFileNameExtension value="true" />
    <appendToFile value="true" />
     <rollingStyle value="Composite" /> 
    <maxSizeRollBackups value="10"/>
    <maximumFileSize value="10MB"/>
    <datePattern value="yyyyMMdd" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] - %message%newline" />
    </layout>
  </appender>

  <!--debug-->
  <appender name="debugAppender" type="log4net.Appender.RollingFileAppender">
    <filter type="log4net.Filter.LevelMatchFilter">
      <levelToMatch value="DEBUG" />
    </filter>
    <filter type="log4net.Filter.DenyAllFilter" />
    <file value="Logs/debug.log" />
    <encoding value="utf-8"/>
    <preserveLogFileNameExtension value="true" />
    <appendToFile value="true" />
    <rollingStyle value="Composite" /> 
    <maxSizeRollBackups value="10"/>
    <maximumFileSize value="10MB"/>
    <datePattern value="yyyyMMdd" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] - %message%newline" />
    </layout>
  </appender>

  <!--warn-->
  <appender name="warnAppender" type="log4net.Appender.RollingFileAppender">
    <filter type="log4net.Filter.LevelMatchFilter">
      <levelToMatch value="Warn" />
    </filter>
    <filter type="log4net.Filter.DenyAllFilter" />
    <file value="Logs/warn.log" />
    <encoding value="utf-8"/>
    <preserveLogFileNameExtension value="true" />
    <appendToFile value="true" />
    <rollingStyle value="Composite" /> 
    <maxSizeRollBackups value="10"/>
    <maximumFileSize value="10MB"/>
    <datePattern value="yyyyMMdd" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] - %message%newline" />
    </layout>
  </appender>

  <!--fatal-->
  <appender name="fatalAppender" type="log4net.Appender.RollingFileAppender">
    <filter type="log4net.Filter.LevelMatchFilter">
      <levelToMatch value="Fatal" />
    </filter>
    <filter type="log4net.Filter.DenyAllFilter" />
    <file value="Logs/fatal.log" />
    <encoding value="utf-8"/>
    <preserveLogFileNameExtension value="true" />
    <appendToFile value="true" />
    <rollingStyle value="Composite" /> 
    <maxSizeRollBackups value="10"/>
    <maximumFileSize value="10MB"/>
    <datePattern value="yyyyMMdd" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] - %message%newline" />
    </layout>
  </appender>
  <root>
    <level value="ALL" />
    <appender-ref ref="errorAppender" />
    <appender-ref ref="infoAppender" />
    <appender-ref ref="debugAppender" />
    <appender-ref ref="warnAppender" />
    <appender-ref ref="fatalAppender" />
  </root>
</log4net>

使用方法：

static private log4net.ILog log = log4net.LogManager.GetLogger(typeof(所在类的类名));

log.Error(ex.ToString()); //异常日志具体根据配置文件中配置的类型

如果运行提示找不到log4net.config文件，请复制log4net.config 文件到bin文件夹下的 Debug 文件中和Release 文件中。