asp.net core 项目添加nlog日志（loggerFactor.AddNLog 过时处理（.net core 3.1））

1、安装Nlog包

使用nuget安装  NLog.Extensions.Logging  包，如下：

 2、在项目添加nlog.config文件

 3、nlog.config文件：

<?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"
      internalLogLevel="Warn"
      internalLogFile="internal-nlog.txt">

  <!-- define various log targets -->
  <targets>
    <!-- write logs to file -->
    <target xsi:type="File" name="allfile" fileName="Loggers/${shortdate}.log"
                 layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />


    <target xsi:type="File" name="ownFile-web" fileName="Loggers/${shortdate}.log"
             layout="${longdate}|${logger}|${uppercase:${level}}|  ${message} ${exception}" />

    <target xsi:type="Null" name="blackhole" />
  </targets>

  <rules>
    <!--All logs, including from Microsoft-->
    <logger name="*" minlevel="Trace" writeTo="allfile" />

    <!--Skip Microsoft logs and so log only own logs-->
    <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
    <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
  </rules>
</nlog>

4、Program类中的Main添加如下代码：

 public static void Main(string[] args)
        {
            CreateHostBuilder(args)
                .ConfigureLogging((ILoggingBuilder logBuilder) =>
            {
                logBuilder.AddNLog();
                logBuilder.AddConsole();
                //logBuilder.confi            
                NLog.LogManager.LoadConfiguration("Config/nlog.config");
            }).Build().Run();
        }

5、Controller 调用Nlog 方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace Core.RFID.WebApi.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 ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
        public IEnumerable<WeatherForecast> Get()
        {
            _logger.LogInformation("测试Log");
            _logger.LogWarning("LogWarning测试Log");
            _logger.LogError("LogError测试");
            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();


        }
    }
}

6、运行效果：

 7、说明，使用下面方法就会出现方法过时：应该使用第4步骤的方法，在 Program类中的Main添加如下代码：

  public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactor)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            LogManager.LoadConfiguration("Config/nlog.config");
            //添加NLog
            loggerFactor.AddNLog();

        
            app.UseRouting();


            app.UseAuthentication();
            app.UseAuthorization();
         
  
            app.UseStaticFiles();

            app.UseEndpoints(endpoints =>
            {
                //endpoints.MapControllers();
                endpoints.MapControllerRoute("default", "api/{controller}/{action}");
            });
        }