.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();
         }
 }