.NET Core使用log4Net记录日志

1.引入Nuget包

log4net

2.添加log4Net配置文件

<?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="FileAppender" type="log4net.Appender.FileAppender">
      <file value="log-file.log" />
      <appendToFile value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="logfile/" />   //指定日志文件保存的目录
      <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="FileAppender" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>

  </log4net>
</configuration>

3.在StartUp.cs中配置log4Net

        //为StartUp.cs添加属性
        public static ILoggerRepository repository { get; set; }

        public Startup(IConfiguration configuration, IHostingEnvironment env)
        {
            Configuration = configuration;
            //log4net
            repository = LogManager.CreateRepository("NETCoreRepository");
            //指定配置文件
            XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));

        }

4.在程序中中使用log4Net写日志

下面是注入到控制器中的示例

    public class HomeController : Controller
    {
        //log4Net
        private ILog log;
        public UploadFilesController(IHostingEnvironment hostingEnv)
        {
            //log4Net
            this.log = LogManager.GetLogger(Startup.repository.Name, typeof(HomeController));
        }
        public IActionResult Index()
        {
            var name = message.Name;
            var age = message.Age;
            log.Error("error message");
            return View();
        }
}