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

Registering services conditionally

In a real-world application, it is common practice to conditionally register some services depending on their environment variables. This practice is useful when we want to initialize third-party dependencies differently, such as a data source. The following code shows how to register services conditionally, based on the environment:

using Microsoft.AspNetCore.Hosting;using Microsoft.Extensions.Configuration;using Microsoft.Extensions.DependencyInjection;using Microsoft.Extensions.Hosting;namespace SampleAPI{    public class Startup    {        public Startup(IConfiguration configuration,         IWebHostEnvironment env)        {            Configuration = configuration;            Environment = env;        }        public IConfiguration Configuration { get; }        public ...