lab-exercise-01.md

1. Add a new controller

The following are the essential pieces you'll need to create a controller:

• Inherit from ControllerBase - This provides the properties and methods that ASP.NET Core needs to treat the class as a controller.
• [ApiController] attribute - This isn't strictly necessary, but it provides common functionality to automatically make your app act like a web app.
• [Route] attributes on the class and/or on actions - These define the paths that should route to actions on this controller.
  • When the [ApiController] attribute is used, the [Route] attribute must be specified.
  • If the [Route] attribute is specified on the entire class (as it is in the ValuesController.cs example), it applies to all methods in the class.
  • If a [Route] attribute is on an individual action, the [Route] specified on the class acts as a base URL that is extended by the route defined on the action.

Exercise 1

Create a new file in your Controllers folder named MathController.cs. Use ValuesController.cs as a guideline to set up MathController as a new controller.

Set up one action on your new MathController class:

• URL: https://localhost:5001/api/math/negative/{number}
• Responds to HTTP GET requests
• Accepts one integer as input
• Returns the negation of the input number

Tips

• See the routing documentation for help defining routes.

Verify

• https://localhost:5001/api/math/negative/100 should return -100.
• https://localhost:5001/api/math/negative/-55 should return 55.