Demo - App Configuration Service - To verify percentage filter applied on feature flag

Program.cs

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.FeatureManagement;
using Microsoft.FeatureManagement.FeatureFilters;

static async Task Main(string[] args)
{
    var connectionString = Environment.GetEnvironmentVariable("ConnectionString");
    IConfigurationRoot configuration = 
        new ConfigurationBuilder()
        .AddAzureAppConfiguration(options =>
        {
            options.Connect(connectionString)   // To connect with App Config store
              .Select("_")                      // To load nothing other than feature flags
              .UseFeatureFlags(featureOptions =>
              {
                  // Modify default caching internval
                  featureOptions.CacheExpirationInterval = new TimeSpan(0, 0, 45);

                  // Load feature flags with label = "first"
                  featureOptions.Label = "first";
              });
        })
        .Build();

    // Initialize Feature Management
    IServiceCollection services = new ServiceCollection();
    services
        .AddSingleton<IConfiguration>(configuration)
        .AddFeatureManagement()
        .AddFeatureFilter<PercentageFilter>();


    // To resolve the dependency from DI container
    using (ServiceProvider serviceProvider = services.BuildServiceProvider())
    {
        IFeatureManager featureManager = serviceProvider.GetRequiredService<IFeatureManager>();

        var flagEnabledCount = 0;
        for (int attempt = 1; attempt <= 20; attempt++)
        {
            if (await featureManager.IsEnabledAsync("StorageFeature"))
            {
                Console.WriteLine($"{attempt} : Storage Feature is Enabled.");
                flagEnabledCount++;
            }
            else
            {
                Console.WriteLine($"{attempt} : Storage Feature is NOT Enabled.");
            }
        }

        Console.WriteLine();
        Console.WriteLine($"Total Attempts = 20, Enabled was returned {flagEnabledCount} times.");
    }
}