Program.cs

using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI.Services;
using Microsoft.EntityFrameworkCore;
using Project.Configs;
using Project.Data;
using Project.Models;
using Project.Services;
using Project.Components;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var connectionString = builder
    .Configuration
    .GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");

// Configure User Secrets
builder.Configuration.AddUserSecrets<Program>();

// Configure Database
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlite(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

// Configure Identity
builder.Services
    .AddIdentity<ApplicationUser, IdentityRole>(options =>
        options.SignIn.RequireConfirmedAccount = true)
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddDefaultTokenProviders();

builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();

builder.Services
    .AddRazorComponents()
    .AddInteractiveServerComponents();

// Configure Policies
builder.Services
    .AddAuthorizationBuilder()
    .AddPolicy("RequireAdminRole", policy => policy.RequireRole("Admin"));

// Configure Email Services
builder.Services.Configure<EmailSettings>(builder.Configuration.GetSection("EmailSettings"));
builder.Services.AddTransient<IEmailSender, EmailSender>();

// Configure Custom Services
builder.Services
    .AddScoped<CartService>()
    .AddTransient<UploadService>()
    .AddScoped<PopularItemsService>();

var app = builder.Build();

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

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

app.Run();