Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using ChatApp.Database;
using ChatApp.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.EntityFrameworkCore.SqlServer;
using Microsoft.EntityFrameworkCore.Design;
using ChatApp.Hubs;

namespace ChatApp
{
    public class Startup
    {
        private IConfiguration _config;

        public Startup(IConfiguration config) => _config = config;        
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc(options => options.EnableEndpointRouting = false);
            services.AddDbContext<AppDbContext>(options => options.UseSqlServer(_config.GetConnectionString("DefaultConnection")));
            services.AddIdentity<User, IdentityRole>(options =>{
                options.Password.RequireDigit = false;
                options.Password.RequireLowercase = false;
                options.Password.RequireNonAlphanumeric = false;
                options.Password.RequireUppercase = false;
                options.Password.RequiredLength = 5;
            })
            .AddEntityFrameworkStores<AppDbContext>()
            .AddDefaultTokenProviders();
            services.AddSignalR();
        }

        [Obsolete]
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseDeveloperExceptionPage();
            app.UseStaticFiles();
            app.UseAuthentication();
            app.UseSignalR(routes =>
            {
                routes.MapHub<ChatHub>("/chatHub");
            });
            //app.UseEndpoints(routes => {
                //routes.MapHub<ChatHub>("/chatHub");});
            app.UseMvcWithDefaultRoute();
        }
    }
}