.NET Core 下使用 Log4Net 记录日志

Log4Net相信大家都很熟悉了，算是比较主流和著名的日志组件了。

• 官网 id="最佳实践">最佳实践

  在项目中添加组件包

  Install-Package log4net

  添加log4net.config文件

  <?

  控制台项目

  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());   

  

  AspNetCore项目

  新建一个静态类，写一个扩展方法UseLog4Net()，用于log4net初始化。

  public static class Log4NetExtensions{ public static IHostBuilder UseLog4Net(this IHostBuilder hostBuilder) {  var log4netRepository = LogManager.GetRepository(Assembly.GetEntryAssembly());  

  扩展方法返回IHostBuilder对象，这样可以链式调用，美化代码，然后在Program.cs中使用扩展方法UseLog4Net()。

  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，然后在任意地方写入日志即可。

  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();  } }}

  

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  Log4Net相信大家都很熟悉了，算是比较主流和著名的日志组件了。官网id="最佳实践">最佳实践在项目中添加组件包Install-Packagelog4net添加log4net.config文件<?控制台项目usinglog4net;usinglog4net.Config;usingSystem;usingSystem.IO;usingSystem.Reflect
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