Azure App Configuration

DataController.cs

using System.Collections.Generic;
using FeatureTogglerApp.Features;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;

namespace FeatureTogglerApp.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class DataController : ControllerBase
    {
        private readonly FeatureOptions _featureOptions;

        public DataController(IOptionsSnapshot<FeatureOptions> featureOptions)
        {
            _featureOptions = featureOptions.Value;
        }

        [HttpGet]
        public IEnumerable<string> Get()
        {
            var user = "janne"; // DEMO: Example user to look for feature flags

            // Use app level toggles and if that is not enabled
            // then use toggle from user level (optional)
            var dataApiEnabled =
                _featureOptions.DataApiEnabled ||
                (_featureOptions.Users.ContainsKey(user) &&
                 _featureOptions.Users[user].DataApiEnabled);

            if (dataApiEnabled)
            {
                return new string[] { "cool", "api", "in", "use" };
            }
            else
            {
                return new string[] { /* None since api not in use. */ };
            }
        }
    }
}