引用log4net.dll库

[log4net.dll库下载地址][1]

AssemblyInfo.cs

最后一行添加如下代码:

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

log4net.config

注意把这个文件的属性”复制到输出目录”值改为”始终复制”, 不然会不生效

<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
  <configSections> 
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/> 
  </configSections> 
 
  <log4net> 
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"> 
      <param name= "File" value= "D:\App_Log\servicelog\"/> 
      <param name= "AppendToFile" value= "true"/> 
      <param name= "MaxSizeRollBackups" value= "10"/> 
      <param name= "StaticLogFileName" value= "false"/> 
      <param name= "DatePattern" value= "yyyy-MM-dd&quot;.read.log&quot;"/> 
      <param name= "RollingStyle" value= "Date"/> 
      <layout type="log4net.Layout.PatternLayout"> 
        <param name="ConversionPattern" value="[%date]-[%thread]-[%-p]-[%logger]-[%M] -> %message%newline" /> 
      </layout> 
    </appender> 
 
    <appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender"> 
      <mapping> 
        <level value="DEBUG" /> 
        <foreColor value="Red, HighIntensity" /> 
      </mapping> 
      <mapping> 
        <level value="DEBUG" /> 
        <foreColor value="Green" /> 
      </mapping> 
      <layout type="log4net.Layout.PatternLayout"> 
        <conversionPattern value="%n%date{HH:mm:ss,fff} [%-5level] %m" /> 
      </layout> 
 
      <filter type="log4net.Filter.LevelRangeFilter"> 
        <param name="LevelMin" value="Info" /> 
        <param name="LevelMax" value="Fatal" /> 
      </filter> 
    </appender> 
 
    <root> 
      <level value="all" /> 
      <appender-ref ref="ColoredConsoleAppender"/> 
      <appender-ref ref="RollingLogFileAppender"/> 
    </root> 
  </log4net> 
</configuration>

应用

private static ILog log = LogManager.GetLogger(typeof(Program)); 
[STAThread] 
static void Main(string[] args) 
{ 
    log.Info("info"); 
    log.Debug("Debug"); 
    log.Error("Error"); 
}

https://segmentfault.com/a/1190000012601876