首页 .Net正文

.NET Core下使用Log4Net记录日志的方法步骤

Admin .Net 2020-11-22 05:11:08 23

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: logging.apache.org

开源地址: https://github.com/apache/logging-log4net

最佳实践

在项目中添加组件包

Install-Package log4net

添加 log4net.config 文件

<?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&quot;.log&quot;" />
  <param name="StaticLogFileName" value="false" />
  <layout type="log4net.Layout.PatternLayout,log4net">
  <param name="ConversionPattern" value="%n
{
 &quot;system&quot;: &quot;Meowv.Blog&quot;,
 &quot;datetime&quot;: &quot;%d&quot;,
 &quot;description&quot;: &quot;%m&quot;,
 &quot;level&quot;: &quot;%p&quot;,
 &quot;info&quot;: &quot;%exception&quot;
}" />
  </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&quot;.log&quot;" />
  <param name="StaticLogFileName" value="false" />
  <layout type="log4net.Layout.PatternLayout,log4net">
  <param name="ConversionPattern" value="%n
{
 &quot;system&quot;: &quot;Meowv.Blog&quot;,
 &quot;datetime&quot;: &quot;%d&quot;,
 &quot;description&quot;: &quot;%m&quot;,
 &quot;level&quot;: &quot;%p&quot;,
 &quot;info&quot;: &quot;%exception&quot;
}" />
  </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());
   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());
  XmlConfigurator.Configure(log4netRepository, new FileInfo("log4net.config"));

  return hostBuilder;
 }
}

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();
  }
 }
}

到此这篇关于.NET Core下使用Log4Net记录日志的方法步骤的文章就介绍到这了,更多相关.NET Core Log4Net内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持!

© 2021 编程脚本学习网 苏ICP备17028197号