Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Off_Black.DB;
using Off_Black.Interfaces;
using Off_Black.Repositories;
using Off_Black.Service.Interfaces;
using Off_Black.Service.Services;
using Service.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Off_Black.Wep
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            #region Scopes
            services.AddScoped<MappingService, MappingService>();

            services.AddScoped<ICategoryService, CategoryService>();
            services.AddScoped<ICategoryRepository, CategoryRepository>();

            services.AddScoped<ICustomerService, CustomerService>();
            services.AddScoped<ICustomerRepository, CustomerRepository>();

            services.AddScoped<IOrderItemService, OrderItemService>();
            services.AddScoped<IOrderItemRepository, OrderItemRepository>();

            services.AddScoped<IOrderService, OrderService>();
            services.AddScoped<IOrderRepository, OrderRepository>();

            services.AddScoped<IProductService, ProductService>();
            services.AddScoped<IProductRepository, ProductRepository>();

            services.AddScoped<IUserService, UserService>();
            services.AddScoped<IUserRepository, UserRepository>();

            #endregion

            services.AddDbContext<OffBlackContext>(options => options
                .UseSqlServer("Server = (localdb)\\mssqllocaldb; Database = OffBlackDB; Trusted_Connection = True; ")
                .EnableSensitiveDataLogging(true));

            services.AddDistributedMemoryCache();

            #region SESSION
            services.AddDistributedMemoryCache();

            services.AddSession(options =>
            {
                // Set a short timeout for easy testing.
                //options.IdleTimeout = TimeSpan.FromSeconds(100);
                options.Cookie.HttpOnly = true;
                // Make the session cookie essential  
                options.Cookie.IsEssential = true;
            });
            #endregion

            services.AddRazorPages();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthentication();
            app.UseAuthorization();

            app.UseSession();

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