ASP.NET Core Routing & Controllers 2

Question 1

Which attribute binds an action parameter from the URL route data?

Accepted Answer

[FromRoute]

Answer

[FromRoute] explicitly binds the parameter value from route template tokens rather than other sources.

Question 2

What does app.MapControllers() do in the minimal hosting model?

Accepted Answer

Maps attribute-routed controller endpoints to the routing system

Answer

MapControllers() registers attribute-routed controllers as endpoints without requiring conventional routes.

Question 3

How do you make a route parameter optional in ASP.NET Core attribute routing?

Accepted Answer

Add a ? after the parameter name: {id?}

Answer

Appending ? to a route token like {id?} marks it optional, allowing the route to match URLs with or without the segment.

Question 4

Which helper method creates a 201 Created response with a Location header in an API controller?

Accepted Answer

CreatedAtAction()

Answer

CreatedAtAction() generates the Location header by routing to the specified action, following REST conventions for POST.

Question 5

What does [Bind] attribute do on a model class in ASP.NET Core MVC?

Accepted Answer

Restricts which properties are included during model binding

Answer

[Bind("Prop1,Prop2")] whitelists only the specified properties, preventing over-posting security vulnerabilities.

ASP.NET Core Practice Test