一、安装Log4net
1、使用Nuget包进行安装
在依赖项上面右键，选择“管理NuGet程序包”，如下图所示：
在浏览界面输入log4net，然后点击安装，如下图所示：
2、使用程序包管理器控制台进行安装
使用Install-Package Log4net命令进行安装，如下图所示：
二、配置log4net使用的配置文件
配置文件如下：
1 <?xml version="1.0" encoding="utf-8" ?> 2 <configuration> 3 <!-- This section contains the log4net configuration settings --> 4 <log4net> 5<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender"> 6 <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" /> 7</appender> 8 9<appender name="FileAppender" type="log4net.Appender.FileAppender">10<file value="log-file.log" />11<appendToFile value="true" />12<layout type="log4net.Layout.PatternLayout">13 <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />14</layout>15 </appender>16 17 <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">18<file value="D:\study\logfile/" /> //指定日志文件保存的目录19<appendToFile value="true" />20<rollingStyle value="Composite" />21<staticLogFileName value="false" />22<datePattern value="yyyyMMdd'.log'" />23<maxSizeRollBackups value="10" />24<maximumFileSize value="1MB" />25<layout type="log4net.Layout.PatternLayout">26 <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />27</layout>28 </appender>29 30 <!-- Setup the root category, add the appenders and set the default level -->31 <root>32<level value="ALL" />33<appender-ref ref="ConsoleAppender" />34<appender-ref ref="FileAppender" />35 <appender-ref ref="RollingLogFileAppender" />36</root>37 38 </log4net>39 </configuration>
三、在Startup.cs类里面配置使用log4net
1 public static ILoggerRepository repository { get; set; }2 public Startup(IConfiguration configuration)3 {4 Configuration = configuration;5 repository = LogManager.CreateRepository("NETCoreRepository");6 // 指定配置文件7 XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));8 }
四、在控制器里面注入log4net
1 using System; 2 using System.Collections.Generic; 3 using System.Diagnostics; 4 using System.Linq; 5 using System.Threading.Tasks; 6 using log4net; 7 using Microsoft.AspNetCore.Hosting; 8 using Microsoft.AspNetCore.Mvc; 9 using NetCoreLogDemo.Models;10 11 namespace NetCoreLogDemo.Controllers12 {13public class HomeController : Controller14{15 private ILog log;16 17 public HomeController(IHostingEnvironment hostingEnv)18 {19 this.log = LogManager.GetLogger(Startup.repository.Name, typeof(HomeController));20 }21 22 public IActionResult Index()23 {24 log.Error("测试日志");25 return View();26 }27 28 public IActionResult About()29 {30 ViewData["Message"] = "Your application description page.";31 32 return View();33 }34 35 public IActionResult Contact()36 {37 ViewData["Message"] = "Your contact page.";38 39 return View();40 }41 42 public IActionResult Error()43 {44 return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });45 }46}47 }
测试结果：
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