Use NLog in project

first install the below  highlighted nlog package using nuget.

step1:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>

    <TargetFramework>netcoreapp3.1</TargetFramework>

  </PropertyGroup>

  <ItemGroup>

    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.4" />

    <PackageReference Include="NLog.Config" Version="4.7.3" />

    <PackageReference Include="NLog.Web.AspNetCore" Version="4.9.3" />

  </ItemGroup>

  <ItemGroup>

    <None Update="C:\Users\mukesh\.nuget\packages\nlog.config\4.7.3\contentFiles\any\any\NLog.config">

      <CopyToOutputDirectory>Always</CopyToOutputDirectory>

    </None>

  </ItemGroup>

</Project>

Step 2

Now create the project and create NLOG.config and paste the below code.

and create the folders demologs in c drive 

<?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"

      xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd"

      autoReload="true">

<targets>

<target xsi:type="File" name="fileTarget" fileName="C:\DemoLogs\nlog-all-${shortdate}.log" layout="${longdate} ${uppercase:${level}} ${message}" />

</targets>

<rules>

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

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

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

</rules>

</nlog>

now create a controller such as a random name and put the code below

Step 3:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

using Microsoft.AspNetCore.Http;

using Microsoft.AspNetCore.Mvc;

using Microsoft.Extensions.Logging;

using NLog;

using NLog.Fluent;

namespace NLOG.WebApi.Controllers

{

    [Route("api/[controller]")]

    [ApiController]

    public class NlogController : ControllerBase

    {

        private static ILogger<NlogController> _logger;

        public NlogController(ILogger<NlogController> logger)

        {

            _logger = logger;

        }

        [HttpGet]

        public void Get()

        {

            _logger.LogInformation(" Nlog Controller request");

            int count;

            try

            {

                for (count = 0; count <= 5; count++)

                {

                    if (count == 3)

                    {

                        throw new Exception("Nlog Exception Occured");

                    }

                    else

                    {

                        _logger.LogInformation("Iteration Count is {iteration}", count);

                    }

                }

            }

            catch (Exception ex)

            {

                _logger.LogError(ex, "Exception Caught");

            }

        }

    }

}

Step 4:

configuring in program.cs file

using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.Hosting;

using Microsoft.Extensions.Logging;

using NLog.Extensions.Logging;

using NLog.Web;

namespace NLOG.WebApi

{

    public class Program

    {

        public static void Main(string[] args)

        {

            var logger = NLog.Web.NLogBuilder.ConfigureNLog("NLog.config").GetCurrentClassLogger();

            try

            {

                logger.Debug("Application Starting Up");

                CreateHostBuilder(args).Build().Run();

            }

            catch (Exception exception)

            {

                //NLog: catch setup errors

                logger.Error(exception, "Stopped program because of exception");

                throw;

            }

            finally

            {

                // Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)

                NLog.LogManager.Shutdown();

            }

        }

        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();  // NLog: Setup NLog for Dependency injection

    }

}

output would be like this