Dependency Injection with Azure Functions and FunctionsStartup

 1[assembly: FunctionsStartup(typeof(MyCompany.MyApp.Startup))]
 2namespace MyCompany.MyApp
 3{
 4    public class Startup : FunctionsStartup
 5    {
 6        public override void Configure(IFunctionsHostBuilder builder)
 7        {
 8            // Http Client
 9            builder.Services.AddHttpClient();
10
11            // Analaytic Options
12            builder.Services.Configure<AnalyticsOptions>(options =>
13                {
14                    options.Url = Environment.GetEnvironmentVariable("ANALYTICS_SERVICE_API");
15                });
16            builder.Services.AddScoped<IAnalyticsService, NoiseAnalyticsService>();
17
18            // Notification
19            builder.Services.AddScoped<INotificationProvider, NotificationProvider>();
20
21            // Engine
22            builder.Services.AddMediatR(typeof(DeviceProcessingEngine));
23        }
24    }
25}

 1public class IoTHubMessageProcessor
 2{
 3    private readonly IMediator _mediator;
 4
 5    public IoTHubMessageProcessor(IMediator mediator)
 6    {
 7        _mediator = mediator;
 8    }
 9
10    [FunctionName("iot-hub-message")]
11    public async Task Run(
12        [EventHubTrigger("device-sensor-events", 
13            Connection = "AZURE_EVENT_HUB_DTSENSOR_INGEST_CONNECTIONSTRING")] EventData[] eventData,
14        ILogger log)
15    {
16        if (eventData is null)
17        {
18            log.LogWarning($"Received sensor event but no messages were passed.");
19            return;
20        }