ASP.NET Core Dependency Injection 2

Question 1

Which method retrieves a required service and throws if it is not registered?

Accepted Answer

GetRequiredService<T>()

Answer

GetService<T>()

Answer

Resolve<T>()

Answer

Fetch<T>()

Question 2

How do you inject multiple implementations of the same interface in ASP.NET Core DI?

Accepted Answer

Inject IEnumerable<TService> in the constructor

Answer

Register them under different names

Answer

Use a factory method only

Answer

Multiple implementations are not supported

Question 3

What is the purpose of the IServiceScope interface in ASP.NET Core?

Accepted Answer

It creates a child DI scope for resolving scoped services outside a request

Answer

It defines service registration rules

Answer

It limits the number of service instances

Answer

It scopes logging to a component

Question 4

Which DI registration method allows providing a factory function instead of a type?

Accepted Answer

services.AddScoped<T>(sp => new T(...))

Answer

services.UseFactory<T>()

Answer

services.AddWithFactory<T>()

Answer

services.RegisterFactory<T>()

Question 5

What is constructor injection in ASP.NET Core DI?

Accepted Answer

Declaring dependencies as constructor parameters that the DI container resolves automatically

Answer

Manually creating service instances in constructors

Answer

Injecting configuration into constructors only

Answer

Using [Inject] attributes on constructors

Question 6

What attribute enables property injection in ASP.NET Core Razor Pages?

Accepted Answer

[FromServices]

Answer

[BindProperty]

Answer

[Inject]

Answer

[AutoInject]