Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using AnimeList.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.EntityFrameworkCore;

namespace AnimeList
{
    public class Startup
    {
        public Startup(IConfiguration config)
        {
            Configuration = config;
        }
        private IConfiguration Configuration { get; set; }
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews();
            services.AddDbContext<AnimeDbContext>(opts => {
                opts.UseSqlServer(
                Configuration["ConnectionStrings:AnimeListConnection"]);
            });
            services.AddScoped<IAnimeListRepository, EFAnimeListRepository>();
        }
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseDeveloperExceptionPage();
            app.UseStatusCodePages();
            app.UseStaticFiles();
            app.UseRouting();
            app.UseEndpoints(endpoints => {
                endpoints.MapControllerRoute("catpage","{category}/Page{productPage:int}",
                    new { Controller = "Home", action = "Index" });
                
                endpoints.MapControllerRoute("page", "Page{productPage:int}",
                    new { Controller = "Home", action = "Index", productPage = 1 });

                endpoints.MapControllerRoute("category", "{category}",
                    new { Controller = "Home", action = "Index", productPage = 1 });

                endpoints.MapControllerRoute("pagination",
                    "Anime/Page{productPage}",
                    new { Controller = "Home", action = "Index", productPage = 1 });
                endpoints.MapDefaultControllerRoute();
            });
            SeedData.EnsurePopulated(app);
        }
    }
}