本文主要介紹在ASP.NET Core中使用兩種日志組件

• Logging：Flexible & free open-source logging for .NET
• Log4Net: Apache log4net框架在Microsoft .NET平臺(tái)的實(shí)現(xiàn)

一 使用ASP.NET Core本身自帶了輕量級(jí)的日志記錄日志框架Logging

appsettings.json中對(duì)Logging的配置：

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Warning"
    }
  }
}

Logging的使用

    public class HomeController : Controller
    {
       
        private readonly ILogger _logger;
        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }
        public IActionResult Index()
        {
            _logger.LogError("logger記錄錯(cuò)誤");
            return View();
        }
    }

錯(cuò)誤將打印在控制臺(tái)

image.png

二使用第三方日志組件(再此使用Log4Net)

ASP.NET Core 2.0已經(jīng)可以使用Log4Net，安裝Nuget包眉踱，我安裝的是log4net 2.08

log4net.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <!-- This section contains the log4net configuration settings -->
  <log4net debug="true">
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="logs\AT" />
      <!--日期的格式，每天換一個(gè)文件記錄歹鱼，如不設(shè)置則永遠(yuǎn)只記錄一天的日志，需設(shè)置-->
      <datePattern value="_yyyyMMdd'.log'" />
      <!--是否追加到文件,默認(rèn)為true卜高，通常無(wú)需設(shè)置-->
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="10MB" />
      <!--StaticLogFileName的值如果為true弥姻，則當(dāng)前日志文件(相對(duì)于歷史日志文件而言)的文件名只取File參數(shù)。如果為false掺涛，則文件名取File+DatePattern庭敦。-->
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%d [%t] %-5p %c - %m%n" />
        <param name="Header" value=" ----------------------Header-------------------------&#xD;&#xA;" />
        <param name="Footer" value=" ----------------------footer--------------------------&#xD;&#xA;" />
      </layout>
    </appender>
    <root>
      <level value="ALL" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>
</configuration>

修改啟動(dòng)類

        public static ILoggerRepository Repository;//log4net
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
            Repository = LogManager.CreateRepository("NETCoreRepository");
            XmlConfigurator.Configure(Repository, new FileInfo("log4net.config"));
        }

在控制器中調(diào)用Log4Net

       private ILog log = LogManager.GetLogger(Startup.Repository.Name, typeof(HomeController));
        private readonly ILogger _logger;
        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }
        public IActionResult Index()
        {
            _logger.LogError("logger記錄錯(cuò)誤");
            log.Error("log4net記錄錯(cuò)誤");
            return View();
        }

結(jié)果：

image.png

image.png