Log4Net 相信大家都很熟悉了，算是比較主流和著名的日志組件了。
官網： logging.apache.org
開源地址： https://github.com/apache/logging-log4net
最佳實踐
在項目中添加組件包
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Install-Package log4net |
添加 log4net.config 文件
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<?xml version="1.0" encoding="utf-8" ?><configuration> <configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/> </configSections> <log4net debug="false"> <appender name="info" type="log4net.Appender.RollingFileAppender,log4net"> <param name="File" value="log4net/info/" /> <param name="AppendToFile" value="true" /> <param name="MaxSizeRollBackups" value="-1"/> <param name="MaximumFileSize" value="5MB"/> <param name="RollingStyle" value="Composite" /> <param name="DatePattern" value="yyyyMMdd\\HH".log"" /> <param name="StaticLogFileName" value="false" /> <layout type="log4net.Layout.PatternLayout,log4net"> <param name="ConversionPattern" value="%n{ "system": "Meowv.Blog", "datetime": "%d", "description": "%m", "level": "%p", "info": "%exception"}" /> </layout> <filter type="log4net.Filter.LevelRangeFilter"> <levelMin value="INFO" /> <levelMax value="INFO" /> </filter> </appender> <appender name="error" type="log4net.Appender.RollingFileAppender,log4net"> <param name="File" value="log4net/error/" /> <param name="AppendToFile" value="true" /> <param name="MaxSizeRollBackups" value="-1"/> <param name="MaximumFileSize" value="5MB"/> <param name="RollingStyle" value="Composite" /> <param name="DatePattern" value="yyyyMMdd\\HH".log"" /> <param name="StaticLogFileName" value="false" /> <layout type="log4net.Layout.PatternLayout,log4net"> <param name="ConversionPattern" value="%n{ "system": "Meowv.Blog", "datetime": "%d", "description": "%m", "level": "%p", "info": "%exception"}" /> </layout> <filter type="log4net.Filter.LevelRangeFilter"> <levelMin value="ERROR" /> <levelMax value="ERROR" /> </filter> </appender> <root> <level value="ALL"></level> <appender-ref ref="info"/> <appender-ref ref="error"/> </root> </log4net></configuration> |
控制臺項目
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using log4net;using log4net.Config;using System;using System.IO;using System.Reflection;namespace ConsoleAppDemo{ class Program { static void Main(string[] args) { var log4netRepository = LogManager.GetRepository(Assembly.GetEntryAssembly()); XmlConfigurator.Configure(log4netRepository, new FileInfo("log4net.config")); ILog log = LogManager.GetLogger(log4netRepository.Name, "NETCorelog4net"); log.Info("NETCorelog4net log"); log.Info("test log"); log.Error("error"); log.Info("linezero"); Console.ReadKey(); } }} |
AspNetCore項目
新建一個靜態類，寫一個擴展方法 UseLog4Net() ，用于 log4net 初始化。
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public static class Log4NetExtensions{ public static IHostBuilder UseLog4Net(this IHostBuilder hostBuilder) { var log4netRepository = LogManager.GetRepository(Assembly.GetEntryAssembly()); XmlConfigurator.Configure(log4netRepository, new FileInfo("log4net.config")); return hostBuilder; }} |
擴展方法返回 IHostBuilder 對象，這樣可以鏈式調用，美化代碼，然后在 Program.cs 中使用擴展方法 UseLog4Net() 。
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using Microsoft.AspNetCore.Hosting;using Microsoft.Extensions.Hosting;namespace WebAppDemo{ public class Program { public static void Main(string[] args) { CreateHostBuilder(args).Build().Run(); } public static IHostBuilder CreateHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); }).UseLog4Net(); }} |
配置完成，然后在任意地方寫入日志即可。
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using log4net;using Microsoft.AspNetCore.Mvc;using System;using System.Collections.Generic;using System.Linq;namespace WebAppDemo.Controllers{ [ApiController] [Route("[controller]")] public class WeatherForecastController : ControllerBase { private static readonly string[] Summaries = new[] { "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching" }; private readonly ILog _log; public WeatherForecastController() { _log = LogManager.GetLogger(typeof(WeatherForecastController)); } [HttpGet] public IEnumerable<WeatherForecast> Get() { _log.Info("Hello, this is a Weather api!"); _log.Warn("Wran !!!"); _log.Error("Controller Error"); var rng = new Random(); return Enumerable.Range(1, 5).Select(index => new WeatherForecast { Date = DateTime.Now.AddDays(index), TemperatureC = rng.Next(-20, 55), Summary = Summaries[rng.Next(Summaries.Length)] }) .ToArray(); } }} |
到此這篇關于.NET Core下使用Log4Net記錄日志的方法步驟的文章就介紹到這了,更多相關.NET Core Log4Net內容請搜索服務器之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持服務器之家！
原文鏈接：https://juejin.im/post/6875848186259472391
