asp.net core 3.1配置log4net

第一步：nuget 引用Microsoft.Extensions.Logging.Log4Net.AspNetcore

第二步：Program指向log4Net 如果p.addLog4Net() 

public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
            .ConfigureLogging(p =>
            {
                var path = System.IO.Directory.GetCurrentDirectory();
                p.AddLog4Net($"{path}/config/log4net.config");//配置文件
            })
            .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });

第三步：引入log4net配置文件

<log4net>
  <appender name="Console" type="log4net.Appender.ConsoleAppender">
    <layout type="log4net.Layout.PatternLayout">
      <!-- Pattern to output the caller's file name and line number -->
      <conversionPattern value="%date %5level %logger.%method [%line] - %property{scope} %property{test} MESSAGE: %message%newline %exception" />
    </layout>
  </appender>
  <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
    <file value="log/log.log" />
    <appendToFile value="true" />
    <maximumFileSize value="100KB" />
    <maxSizeRollBackups value="2" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date %5level %logger.%method [%line] - %property{scope} %property{test} MESSAGE: %message%newline %exception" />
    </layout>
  </appender>
  <appender name="TraceAppender" type="log4net.Appender.TraceAppender">
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date %5level %logger.%method [%line] - %property{scope} %property{test} MESSAGE: %message%newline %exception" />
    </layout>
  </appender>
  <appender name="ConsoleAppender" type="log4net.Appender.ManagedColoredConsoleAppender">
    <mapping>
      <level value="ERROR" />
      <foreColor value="Red" />
    </mapping>
    <mapping>
      <level value="WARN" />
      <foreColor value="Yellow" />
    </mapping>
    <mapping>
      <level value="INFO" />
      <foreColor value="White" />
    </mapping>
    <mapping>
      <level value="DEBUG" />
      <foreColor value="Green" />
    </mapping>
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date %5level %logger.%method [%line] - %property{scope} %property{test} MESSAGE: %message%newline %exception" />
    </layout>
  </appender>
  <root>
    <level value="DEBUG" />
    <appender-ref ref="RollingFile" />
    <appender-ref ref="TraceAppender" />
    <appender-ref ref="ConsoleAppender" />
  </root>
</log4net>