ASP.NET Core Dependency Injection

Question 1

Which service lifetime registers a new instance for every HTTP request in ASP.NET Core?

Accepted Answer

Scoped

Answer

Singleton

Answer

Transient

Answer

PerRequest

Question 2

What happens when a Singleton service depends on a Scoped service in ASP.NET Core?

Accepted Answer

It causes a captive dependency anti-pattern and may throw an exception

Answer

The scoped service becomes singleton automatically

Answer

ASP.NET Core handles it transparently

Answer

The singleton is downgraded to scoped

Question 3

Which method registers a service with Transient lifetime in ASP.NET Core DI?

Accepted Answer

services.AddTransient<TService, TImplementation>()

Answer

services.RegisterTransient<TService>()

Answer

services.UseTransient<TService>()

Answer

services.BindTransient<TService>()

Question 4

What interface is used to access the DI service container manually in ASP.NET Core?

Accepted Answer

IServiceProvider

Answer

IServiceContainer

Answer

IDependencyResolver

Answer

IServiceLocator

Question 5

Which ASP.NET Core method is used to register all services with the DI container?

Accepted Answer

ConfigureServices() in Startup or builder.Services in Program.cs

Answer

Configure() in Startup

Answer

RegisterServices() in Program.cs

Answer

SetupDI() in appsettings.json

Question 6

What does services.AddScoped<IService, ServiceImpl>() do?

Accepted Answer

Registers ServiceImpl as the implementation for IService with scoped lifetime

Answer

Adds a singleton implementation

Answer

Creates a new DI scope

Answer

Registers only the interface without implementation