和之前的ASP.NET MVC中的使用LOG4NET的方法有些不同，這里先記錄一下，使用步驟如下 ：

1. 建立 ASP.NET CORE項目中，NUGET中搜索log4net后下載安裝

2. 根目錄建立 log4net.config文件，內容如下：

<?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/" />
????? <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. Startup.cs文件中的Startup方法和ConfigureServices方法里的AddMvc代碼改下，核心代碼如下，記得引用相應的命名空間：

??????? //log4net日志
??????? public static ILoggerRepository repository { get; set; }

??????? public Startup(IConfiguration configuration)
??????? {
??????????? Configuration = configuration;

??????????? //加載log4net日志配置文件
??????????? repository = LogManager.CreateRepository("NETCoreRepository");
??????????? XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));
??????? }

??????? public IConfiguration Configuration { get; }

??????? // This method gets called by the runtime. Use this method to add services to the container.
??????? public void ConfigureServices(IServiceCollection services)
??????? {

??????????? services.AddMvc(options =>
??????????? {
??????????????? options.Filters.Add<Models.HttpGlobalExceptionFilter>(); //加入全局異常類
??????????? });
??????? }

4. Models文件夾中建立 HttpGlobalExceptionFilter.cs 類，用于全局異常后記錄到日志中，內容代碼如下 ：

using log4net;
using Microsoft.AspNetCore.Mvc.Filters;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplication1.Models
{
??? /// <summary>
??? /// 全局異常類
??? /// </summary>
??? public class HttpGlobalExceptionFilter : IExceptionFilter
??? {
??????? private ILog log = LogManager.GetLogger(Startup.repository.Name, typeof(HttpGlobalExceptionFilter));
??????? public void OnException(ExceptionContext context)
??????? {
??????????? log.Error(context.Exception);
??????? }
??? }
}

5. 下面是控制器的代碼，有異常會自動記錄下來，用那個log也能手工記錄日志信息

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using log4net;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
??? public class HomeController : Controller
??? {
??????? private ILog log = LogManager.GetLogger(Startup.repository.Name, typeof(HttpGlobalExceptionFilter));
??????? public IActionResult Index()
??????? {
??????????? throw new Exception("牛腩自定義異常！！！");? //有異常則會記錄到logfile文件夾中
??????????? return View();
??????? }

??????? public IActionResult About()
??????? {
??????????? ViewData["Message"] = "Your application description page.";
??????????? log.Info("打開about頁面了！！！"); //普通的記錄日志
??????????? return View();
??????? }
?
??? }
}

轉載于:https://www.cnblogs.com/niunan/p/8437350.html

總結

以上是生活随笔為你收集整理的asp.net core中使用log4net的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。