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

Scoped services are created once per HTTP request and shared within that request's scope.

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

Injecting a shorter-lived scoped service into a singleton creates a captive dependency; with scope validation enabled, it throws at startup.

Question 3

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

Accepted Answer

services.AddTransient<TService, TImplementation>()

Answer

AddTransient<TService, TImplementation>() registers the implementation to be created fresh each time it is requested.

Question 4

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

Accepted Answer

IServiceProvider

Answer

IServiceProvider exposes the GetService and GetRequiredService methods to resolve dependencies from the container.

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

Services are registered in ConfigureServices() (classic Startup) or via builder.Services in the minimal hosting model.

ASP.NET Core Practice Test