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：
<?xml version="1.0" encoding="utf-8" ?> <configuration&gwww.easck.comt; <!-- 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"> <www.easck.com;file value="D:studylogfile/" /> //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>三、在Startup.cs类里面配置使用log4net
public static ILoggerRepository repository { get; set; }public Startup(IConfiguration configuration){ Configuration = configuration; repository = LogManager.CreateRepository("NETCoreRepository"); // 指定配置文件 XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));}四、在控制器里面注入log4net
using System;using System.Collections.Generic;using System.Diagnostics;using System.Linq;using System.Threading.Tasks;using log4net;uszmuvShwnrying Microsoft.AspNetCore.Hosting;using Microsoft.AspNetCore.Mvc;using NetCoreLogDemo.Models;namespace NetCoreLogDemo.Controllers{ public class HomeController : Controller { private ILog log; public HomeController(IHostingEnvironment hostingEnv) { this.log = LogManager.GetLogger(Startup.repository.Name, typeof(HomeController)); } public IActionResult Index() { log.Error("测试日志"); return View(); } public IActionResult About() { ViewData["Message"] = "Your application description page."; return View(); } public IActionResult Contact() { ViewData["Message"] = "Your contact page."; return View(); } public IActionResult Error() { return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier }); } }}测试结果：
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