No Features Returned from Azure App Configuration

Question

I followed the steps at https://learn.microsoft.com/en-us/azure/azure-app-configuration/quickstart-feature-flag-aspnet-core?tabs=core3x for getting a list of features. On my Home controller, if I call

var features = featureManager.GetFeatureNamesAsync();  

I don't see any features. Although, I have features setup. I do see that the app configuration resource in Azure is getting hit.

So, here are the steps I've followed:

1. Created a new .NET Core MVC project targeting 3.1 (to eliminate the fact that .NET Core 5 may have issues)
2. Add the Microsoft.Azure.AppConfiguration.AspNetCore and Microsoft.FeatureManagement.AspNetCore NuGet packages
3. Update startup.cs > Configure > adding in app.UseAzureAppConfiguration();
4. Update startup.cs > ConfigureServices > adding in services.AddFeatureManagement();
5. In the Azure Portal, created a new Azure App Configuration resource in the free tier. Added a single feature called ShowAboutMe and set the value to On
6. In the resource, go to AccessKeys and copy the primary read only key
7. In my application, add a new key/value in appsettings.json called "AppConfigConnectionString" and set the value to the value I just copied.
8. In Program.cs > CreateHostBuilder > added the following:

           Host.CreateDefaultBuilder(args)  
               .ConfigureAppConfiguration((context, builder) =>  
               {  
                   var settings = builder.Build();  
   
                   if (!string.IsNullOrEmpty(settings["AppConfigConnectionString"]))  
                   {  
                       builder.AddAzureAppConfiguration(options => {  
                           options.Connect(settings["AppConfigConnectionString"]);  
                           options.Select(KeyFilter.Any);  
                           options.UseFeatureFlags();  
                       });  
                   }  
               })  
               .ConfigureWebHostDefaults(webBuilder =>  
               {  
                   webBuilder.UseStartup<Startup>();  
               });  
   

9. In Controllers\HomeController.cs, changed the top part of the controller class to resemble this:

       private readonly IFeatureManager _featureManager;  
       private readonly ILogger<HomeController> _logger;  
   
       public HomeController(ILogger<HomeController> logger, IFeatureManager featureManager)  
       {  
           _logger = logger;  
           _featureManager = featureManager;  
       }  
   
       public IActionResult Index()  
       {  
           var features = _featureManager.GetFeatureNamesAsync();  
   
           return View();  
       }  
   

10. Set a breakpoint on the return View() line in the Index method, executed, and checked the results of features. When navigating, I only see this response: System.Collections.Generic.IAsyncEnumerator<string>.Current = null

Any ideas what I can be missing? I have tried .NET Core 5 MVC and .NET Core 5 Razor Pages applications as well with no luck.

Answer 1

After many failed attempts, I created a brand new Azure App Configuration resource. I noticed that like the above resource, this too seems to have a glitch within the portal. Notice the deployment name says 'NoMarketplace'

Then, I tried using the primary access key which then resulted in the following error:

Finally, I used the secondary access key which worked.

Is there an issue with Azure resource provisioning?

Answer 2

I am facing exact problem.

var list = _featureManager.GetFeatureNamesAsync(); // list is null

var toggle2 = _featureManager.IsEnabledAsync("toggle2"); // it give me my value.

Why GetFeatureNamesAsync is returning null? Any Clues?

Answer 3

To start seeing the features list you will need to iterate through, something like that:
var featureNames = _featureManager.GetFeatureNamesAsync();

        await foreach (var name in featureNames)
        {
            var isEnabled = await _featureManager.IsEnabledAsync(name);
            featureList.Add(new FeatureFlag()
            {
                FeatureName = name,
                IsEnabled = isEnabled
            });
        }