ASP.NET Core Routing & Controllers

Question 1

Which attribute defines a route template directly on an ASP.NET Core controller action?

Accepted Answer

[Route]

Answer

[Route("path")] sets the route template for a controller or action, and can be combined with HTTP method attributes.

Question 2

What does the [ApiController] attribute do in ASP.NET Core?

Accepted Answer

Enables automatic model validation, binding source inference, and problem details responses

Answer

[ApiController] opts the controller into API-specific conventions like automatic 400 responses on validation failure.

Question 3

What route token represents an action name in a conventional route template?

Accepted Answer

{action}

Answer

{action} is the conventional route token that maps to the action method name in the default MVC route template.

Question 4

Which return type enables ASP.NET Core Web API actions to return multiple response types with proper metadata?

Accepted Answer

IActionResult or ActionResult<T>

Answer

ActionResult<T> allows returning both a typed result and different HTTP status code responses, enabling OpenAPI documentation.

Question 5

What is the purpose of [HttpGet("{id}")] on an action method?

Accepted Answer

It constrains the action to GET requests and captures an 'id' route parameter

Answer

Combining the HTTP method attribute with a template restricts the HTTP verb and defines the route in one declaration.

ASP.NET Core Practice Test