.Net Core使用 Log4Net

    public class YFLog
    {
        private static log4net.ILog logger = null;
        public static void logInfo(string logstr)
        {
            Console.WriteLine(logstr);
            if(initLog4net())
              logger.Info(logstr);
        }
        public static void logInfo(string format, params object[] args)
        {
            Console.WriteLine(format, args);
            if (initLog4net())
                logger.InfoFormat(format, args);
        }
        public static void logError(string logstr)
        {
            Console.WriteLine(logstr);
            if (initLog4net())
                logger.Error(logstr);
        }
        public static void logError(string format, params object[] args)
        {
            Console.WriteLine(format, args);
            if (initLog4net())
                logger.ErrorFormat(format, args);
        }
        private static object objlock = new object();//初始化log用的锁
        private static bool initLog4net()
        {
            if (logger != null)
                return true;
            lock (objlock)
            {
                if (logger == null)
                {
                    ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository");
                    XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));
                    logger = LogManager.GetLogger(repository.Name, "NETCorelog4net");
                    return true;
                }
            }
            return false;
        }
    }

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <!-- This section contains the log4net configuration settings -->
  <log4net>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
    </appender>
    <appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
      <file value="Logs/" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <staticLogFileName value="false" />
      <datePattern value="error-yyyyMMdd'.log'" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="1MB" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>
    <appender name="infoAppender" type="log4net.Appender.RollingFileAppender">
      <file value="Logs/" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <staticLogFileName value="false" />
      <datePattern value="yyyyMMdd'.log'" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="1MB" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>
    <!-- Setup the root category, add the appenders and set the default level -->
    <root>
      <level value="ALL" />
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="errorAppender" />
      <appender-ref ref="infoAppender" />
    </root>
  </log4net>
</configuration>