NLog官方教程 https://github.com/nlog/nlog/wiki

 

在.NET Core集成NLog

1.通过NuGet 安装包

 

 

 

2.创建配置文件 nlog.config ，将文件的“复制到输出目录”属性设置为始终复制

<?xml version="1.0" encoding="utf-8" ?>

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"

      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

      autoReload="true"

      throwConfigExceptions="true">

 

  <!-- enable asp.net core layout renderers -->

  <extensions>

    <add assembly="NLog.Web.AspNetCore"/>

  </extensions>

  <!-- the targets to write to -->

  <targets>

    <!-- File Target for all log messages with basic details -->

    <target xsi:type="File" name="allfile" fileName=".\nolog\nlog-AspNetCore3-all-${shortdate}.log"

            layout="${longdate}|${event-properties:item=EventId_Id:whenEmpty=0}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />

  </targets>

  <!-- rules to map from logger name to target -->

  <rules>

    <!--All logs, including from Microsoft-->

    <logger name="*" minlevel="Trace" writeTo="allfile" />

    <!--Skip non-critical Microsoft logs and so log only own logs-->

    <logger name="Microsoft.*" maxlevel="Info" final="true" />

  </rules>

</nlog>

 

3. 在program.cs 配置使用NLog

public static IHostBuilder CreateHostBuilder(string[] args) =>

    Host.CreateDefaultBuilder(args)

        .ConfigureWebHostDefaults(webBuilder =>

        {

            webBuilder.UseStartup<Startup>();

        })

        .ConfigureLogging(logging => {

            logging.ClearProviders();

            logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);

        })

        .UseNLog()//设置 NLog 组件 可以依赖注入

;

4.修改appsettings.json 的日记等级，如果有appsettings.Development.json文件，就同意修改。

    "LogLevel": {
      "Default": "Trace",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
}
5.写日记，通过依赖注入获取写日记对象，然后就可以执行写入了
using Microsoft.Extensions.Logging;
public class HomeController : Controller
{
    private readonly ILogger<HomeController> _logger;
    public HomeController(ILogger<HomeController> logger)
    {
        _logger = logger;
        _logger.LogDebug(1, "NLog injected into HomeController");
    }
 
    public IActionResult Index()
    {
        _logger.LogInformation("Hello, this is the index!");
        return View();
    }
6.查看生成的日记