ControllerExample.cs

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;

namespace FileLoggingNlog
{
    [Route("api/[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        private readonly ILogger<ValuesController> _logger;
        public ValuesController(ILogger<ValuesController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
        [Route("get")]
        public string GetUsers()
        {
            int x = 0;
            int y = 1;
            int z = y / x;
            _logger.LogInformation("Values returned from GET route");
            return "values";
        }
    }
}