Startup.cs

using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using TaskManager.Models;
using TaskManager.Services;

namespace TaskManager
{
    public class Startup
    {
        public Startup(IConfiguration configuration, IWebHostEnvironment env)
        {
            Configuration = configuration;
            Env = env;
        }

        public IConfiguration Configuration { get; }

        public IWebHostEnvironment Env { get; set; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDistributedMemoryCache();

            services.Configure<CookiePolicyOptions>(options =>
            {
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });

            services.AddSession(options =>
            {
                options.IdleTimeout = TimeSpan.FromDays(7);
                options.Cookie.IsEssential = true;
            });
            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

            services.AddScoped<IBaseService, BaseService>();
            // Use SQLite if defined, otherwise fallback to SQL Server
            var useSqlite = Configuration.GetConnectionString("SqliteConnection") != null;
            if (useSqlite)
            {
                services.AddDbContext<MainContext>(options =>
                    options.UseSqlite(Configuration.GetConnectionString("SqliteConnection")));
            }
            else
            {
                services.AddDbContext<MainContext>(options =>
                    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
            }
            services.AddControllersWithViews();

            var builder = services.AddRazorPages();

#if DEBUG
            if (Env.IsDevelopment()) builder.AddRazorRuntimeCompilation();
#endif
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            AppHttpContext.Services = app.ApplicationServices;
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

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

            app.UseSession();

            app.UseRouting();

            app.UseAuthorization();
            app.UseCookiePolicy(new CookiePolicyOptions
            {
                MinimumSameSitePolicy = SameSiteMode.Strict
            });

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    "work",
                    "work/{work}",
                    new { controller = "Work", action = "Index" });
                endpoints.MapControllerRoute(
                    "project",
                    "{project}/{key?}",
                    new { controller = "Project", action = "Index" });

                endpoints.MapControllerRoute(
                    "default",
                    "{controller=Home}/{action=Index}/{id?}");
            });

        }
    }

}