Startup.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.FileProviders;
using Tutorial.Web.Data;
using Tutorial.Web.Models;
using Tutorial.Web.Services;

namespace Tutorial.Web
{
    public class Startup
    {
        private readonly IConfiguration _configuration;

        public Startup(IConfiguration configuration)
        {
            _configuration = configuration;
        }
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            services.AddDbContext<DataContext>(
                options => options.UseMySql(_configuration.GetConnectionString("DefaultConnection"))
                );
            //services.AddSingleton<IRepository<Student>, InMemoryRepository>();
            services.AddScoped<IRepository<Student>, EfCoreRepository>();
            services.AddDbContext<UserDbContext>(options => {
                options.UseMySql(_configuration.GetConnectionString("DefaultConnection"));
            });


            services.AddIdentity<User, IdentityRole>(options =>
            {
                // Password settings.
                options.Password.RequireDigit = false;
                options.Password.RequireLowercase = false;
                options.Password.RequireNonAlphanumeric = false;
                options.Password.RequireUppercase = false;
                options.Password.RequiredLength = 1;
                options.Password.RequiredUniqueChars = 1;

                // Lockout settings.
                options.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(5);
                options.Lockout.MaxFailedAccessAttempts = 5;
                options.Lockout.AllowedForNewUsers = true;

                // User settings.
                options.User.AllowedUserNameCharacters =
                            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._@+";
                options.User.RequireUniqueEmail = false;
            }).AddEntityFrameworkStores<UserDbContext>()
                    .AddDefaultTokenProviders();
            
        }

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

            app.UseStaticFiles();
            app.UseStaticFiles(new StaticFileOptions
            {
                RequestPath = "/node_modules",
                FileProvider = new PhysicalFileProvider(Path.Combine(env.ContentRootPath, "node_modules"))
            });

            app.UseAuthentication();

            app.UseMvc(builder=>
            {
                builder.MapRoute("default", "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}