Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using AutoMapper;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace WorkerService
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }
        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureServices((hostContext, services) =>
                {
                    IConfiguration configuration = new ConfigurationBuilder()  .AddJsonFile("appsettings.json", true, true).Build();


                    services.AddHostedService<Worker>()
                    .AddLogging()
                    .AddOptions()
                    .AddScoped<UpdaterService>()
                    .AddScoped<EmailerService>()
                    .AddAutoMapper(typeof(UpdaterService).Assembly);

                });
    }
}