Telegram-Bot-Template/Startup.cs

using Microsoft.AspNetCore.Hosting.Server;
using System;

namespace TG_Bot_Template
{
    public class Startup
    {
        public class Startup
        {
            private readonly IConfiguration configuration;
            
            public Startup()
            {
                configuration = new ConfigurationBuilder()
                    .AddEnvironmentVariables()
                    .AddJsonFile("appsettings.json", optional: true)
                    .Build();
            }

            public void ConfigureServices(IServiceCollection services)
            {
                services.AddControllers();
                services
                        .AddSwaggerGen();

                services
                    .AddSingleton(configuration)
                    .AddSingleton(x => x.CreateScope())
                    .AddHostedService<TelegramBotService>();

            }

            public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
            {
                if (env.IsDevelopment())
                {
                    app.UseDeveloperExceptionPage();
                    app.UseSwagger();
                    app.UseSwagger(c =>
                    {
                        c.RouteTemplate = "/swagger/v1/swagger.json";
                    });
                }
                app.UseStaticFiles();
                app.UseRouting();
                app.UseCors(k => { k.AllowAnyHeader(); k.AllowAnyMethod(); k.AllowAnyOrigin(); k.WithMethods("POST", "GET"); });
                app.UseEndpoints(endpoints =>
                {
                    endpoints.MapControllers();
                });
            }
        }
    }
}