Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using PcrBattleChannel.Algorithm;
using PcrBattleChannel.Data;
using PcrBattleChannel.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace PcrBattleChannel
{
    public class Startup
    {
        public static bool LoadIMContext { get; set; } = true;

        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            //services.AddDbContext<ApplicationDbContext>(options =>
            //    options.UseSqlServer(
            //        Configuration.GetConnectionString("DefaultConnection")));
            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlite(
                    Configuration.GetConnectionString("DefaultSqliteConnection")));

            services.AddDatabaseDeveloperPageExceptionFilter();
            
            services.AddDefaultIdentity<PcrIdentityUser>(options =>
                {
                    options.User.RequireUniqueEmail = true;
                    options.SignIn.RequireConfirmedAccount = false;
                    options.Password.RequireDigit = false;
                    options.Password.RequireUppercase = false;
                    options.Password.RequireNonAlphanumeric = false;
                    options.Lockout.AllowedForNewUsers = false;
                })
                .AddRoles<IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>();

            services.AddLocalization(options => options.ResourcesPath = "Resources");

            services.AddControllersWithViews()
                .AddViewLocalization()
                .AddDataAnnotationsLocalization();

            //Helper class to provide translation from nickname to character id.
            services.AddSingleton<ICharacterAliasProvider>(new CharacterAliasProvider());
            services.AddSingleton<ZhouParserFactory>();
            services.AddScoped<InMemoryStorageContext>();

            //Yobot sync scheduler.
            services.AddHostedService<YobotSyncScheduler>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, InMemoryStorageContext dataContext)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseMigrationsEndPoint();
            }
            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.UseRouting();

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

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
                endpoints.MapRazorPages();
            });

            var supportedCultures = new[] { "zh-CN" };
            var localizationOptions = new RequestLocalizationOptions()
                .SetDefaultCulture(supportedCultures[0])
                .AddSupportedCultures(supportedCultures)
                .AddSupportedUICultures(supportedCultures);
            app.UseRequestLocalization(localizationOptions);

            dataContext.DbContext.Database.Migrate();

            if (LoadIMContext)
            {
                Console.WriteLine("Loading IM context");
                var guilds = dataContext.DbContext.Guilds.ToList();

                var comboCalculator = new FindAllCombos();

                foreach (var g in guilds)
                {
                    var imGuild = dataContext.GetGuildAsync(g.GuildID).Result;
                    comboCalculator.UpdateGuildAsync(dataContext, g.GuildID, imGuild).Wait();
                    CalcComboValues.RunAllAsync(dataContext.DbContext, g, imGuild).Wait();
                }

                Console.WriteLine("IM context loaded.");
            }
        }
    }
}