Program.cs

using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using TestFeatureFlags.Data;
using TestFeatureFlags;
using Azure.Identity;
using Microsoft.Extensions.Configuration.AzureAppConfiguration;
using Microsoft.FeatureManagement;
using Microsoft.FeatureManagement.FeatureFilters;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlite(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddEntityFrameworkStores<ApplicationDbContext>();

// Retrieve the connection string
string endpoint = builder.Configuration["AppConfig:EndPoint"]?? throw new InvalidOperationException("AppConfig endpoint not found.");

// Load configuration from Azure App Configuration
builder.Configuration.AddAzureAppConfiguration(options =>
{
    options.Connect(new Uri(endpoint), new DefaultAzureCredential())// Load all keys that start with `TestApp:` and have no label
           .Select("TestApp:*", LabelFilter.Null)
           // Configure to reload configuration if the registered sentinel key is modified
           .ConfigureRefresh(refreshOptions =>
                refreshOptions.Register("TestApp:Settings:Sentinel", refreshAll: true));
    // Load all feature flags with no label
    options.UseFeatureFlags();                
});

builder.Services.AddRazorPages();

// Add Azure App Configuration middleware to the container of services.
builder.Services.AddAzureAppConfiguration();

// Add feature management to the container of services.
builder.Services.AddFeatureManagement().AddFeatureFilter<TargetingFilter>().AddFeatureFilter<PercentageFilter>();

builder.Services.AddSingleton<ITargetingContextAccessor, TestTargetingContextAccessor>();

// Bind configuration "TestApp:Settings" section to the Settings object
builder.Services.Configure<Settings>(builder.Configuration.GetSection("TestApp:Settings"));

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();
}

// Use Azure App Configuration middleware for dynamic configuration refresh.
app.UseAzureAppConfiguration();

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

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();

app.Run();