Program.cs

using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using TaskManager.Components;
using TaskManager.Components.Account;
using TaskManager.Data;
using TaskManager.Models;

namespace TaskManager
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            var builder = WebApplication.CreateBuilder(args);

            // Add services to the container.
            builder.Services.AddRazorComponents()
                .AddInteractiveServerComponents();

            builder.Services.AddCascadingAuthenticationState();
            builder.Services.AddScoped<IdentityUserAccessor>();
            builder.Services.AddScoped<IdentityRedirectManager>();
            builder.Services.AddScoped<AuthenticationStateProvider, IdentityRevalidatingAuthenticationStateProvider>();

            builder.Services.AddAuthentication(options =>
            {
                options.DefaultScheme = IdentityConstants.ApplicationScheme;
                options.DefaultSignInScheme = IdentityConstants.ExternalScheme;
            })
            .AddIdentityCookies();

            var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
                ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
            builder.Services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(connectionString));
            builder.Services.AddDatabaseDeveloperPageExceptionFilter();

            builder.Services.AddIdentityCore<TeamMember>(options => options.SignIn.RequireConfirmedAccount = true)
                .AddRoles<IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddSignInManager()
                .AddDefaultTokenProviders();

            builder.Services.AddSingleton<IEmailSender<TeamMember>, IdentityNoOpEmailSender>();

            var app = builder.Build();

            // Seed roles upon application start
            using (var scope = app.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                await SeedRoles(services);
            }

            // Configure the HTTP request pipeline.
            if (app.Environment.IsDevelopment())
            {
                app.UseMigrationsEndPoint();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseAntiforgery();

            app.MapRazorComponents<App>()
                .AddInteractiveServerRenderMode();

            // Add additional endpoints required by the Identity /Account Razor components.
            app.MapAdditionalIdentityEndpoints();

            // Run the app
            await app.RunAsync();
        }

        public static async Task SeedRoles(IServiceProvider serviceProvider)
        {
            var roleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();

            string[] roleNames = ["Admin", "ProjectManager", "Others"];
            IdentityResult roleResult;

            foreach (var roleName in roleNames)
            {
                var roleExist = await roleManager.RoleExistsAsync(roleName);
                if (!roleExist)
                {
                    roleResult = await roleManager.CreateAsync(new IdentityRole(roleName));
                }
            }
        }
    }
}