Hands-On RESTful Web Services with ASP.NET Core 3

Registering services using the dependency injection container

We can register the IPaymentService interface in ConfigureServices in the Startup class by adding the following code:

      public class Startup     {           // ...         public void ConfigureServices(IServiceCollection services)         {             services                    .AddTransient<IPaymentService, PaymentService>()                    .AddControllers();                }            // ...       }

The preceding code shows a simple instantiation of a service using the ASP.NET Core container. I've omitted some parts of the Startup class in order to make the code more readable. The runtime executes the services.AddTransient<IPaymentService, PaymentService>() method in order to map the IPaymentService interface with the concrete implementation that was described in the ...