<?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">

  <
 
extensions>
    <!--enable NLog.Web for ASP.NET Core-->
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions>

  <!-- define various log targets -->
  <!--定義日誌檔案目錄-->
  <variable name="logDirectory" value="${basedir}/logs/${shortdate}"/>
  <variable name="nodeName"
 
 value="node1"/>

  <targets async="true">
    <!-- 全部日誌target -->
    <target xsi:type="File"
            name="allfile"
            fileName="${logDirectory}/nlog-all/${shortdate}.log"
            layout="#node1#${longdate}#${logger}#${uppercase:${level}}#${callsite}#${callsite-linenumber}#${aspnet-request-url}#${aspnet-request-method}#${aspnet-mvc-controller}#${aspnet-mvc-action}#${message}#${exception:format=ToString}#"
 

            keepFileOpen="false"
            />

    <!-- 本地檔案日誌target -->
    <target xsi:type="File"
            name="ownLog-file"
            fileName="${logDirectory}/nlog-${level}/${shortdate}.log"
            layout="#${longdate}#${nodeName}#${logger}#${uppercase:${level}}#${callsite}#${callsite-linenumber}#${aspnet-request-url}#${aspnet-request-method}#${aspnet-mvc-controller}#${aspnet-mvc-action}#${message}#${exception:format=ToString}#"
            keepFileOpen="false"
            />

    <!-- Tcp日誌target -->
    <target xsi:type="Network"
            name="ownLog-tcp"
            keepConnection="false"
            address ="tcp://192.168.3.10:5000"
            layout="#${longdate}#${nodeName}#${logger}#${uppercase:${level}}#${callsite}#${callsite-linenumber}#${aspnet-request-url}#${aspnet-request-method}#${aspnet-mvc-controller}#${aspnet-mvc-action}#${message}#${exception:format=ToString}#"
            />
    <!--grok 規則-->
    <!--%#{DATA:request_time}#%{DATA:node_name}#%{DATA:class_name}#%{DATA:log_level}#%{DATA:call_site}#%{DATA:line_number}#%{DATA:request_url}#%{DATA:request_method}#%{DATA:container_name}#%{DATA:action_name}#%{DATA:log_info}#%{DATA:exception_msg}#-->
    <!--空白-->
    <target xsi:type="Null" name="blackhole" />
  </targets>

  <!--日誌級別 Trace -》Debug-》 Info -》Warn-》 Error-》 Fatal-->
  <!--日誌規則-->
  <rules>
    <!--全部日誌, 包括Microsoft日誌-->
    <logger name="*" minlevel="Trace" writeTo="allfile" />

    <!--自定義日誌，排除Microsoft日誌-->
    <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
    <logger name="*" minlevel="Debug" writeTo="ownLog-file" />
    <logger name="*" minlevel="Info" writeTo="ownLog-tcp" />
  </rules>
</nlog>

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using NLog;
using NLog.Extensions.Logging;
using NLog.Web;namespace UserWebApplication
{
    public class Startup
    {

        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            var currentClassLogger = NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
            services.AddSingleton(currentClassLogger);
            services.AddControllers();
          
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory, IHostApplicationLifetime lifetime)
        {
            //loggerFactory.AddNLog();
            //loggerFactory.ConfigureNLog("nlog.config");
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseAuthorization();

            //停止時登出
            lifetime.ApplicationStopped.Register(() =>
            {
                //Nlog 確保在應用程式退出之前重新整理並停止內部計時器/執行緒（避免Linux上出現分段錯誤）
                LogManager.Shutdown();
            });

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using NLog.Web;

namespace UserWebApplication
{
    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>();
                }).ConfigureLogging(logging =>
                {
                    logging.ClearProviders();
                    logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
                }).UseNLog();
    }
}

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Trace",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}

  private readonly ILogger<WeatherForecastController> _logger;

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

        [HttpGet]
        public IEnumerable<WeatherForecast> Get()
        {
            var rng = new Random();
            _logger.LogInformation("這是一條測試訊息Information");

            _logger.LogError("這是一條測試訊息Erro");

            _logger.LogDebug("這是一條測試訊息Debug");

            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();
        }

參考自https://github.com/NLog/NLog/wiki/Getting-started-with-ASP.NET-Core-2