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Building Web Applications with React and ASP.NET Core

Understanding Controllers

Explore the role of controllers in ASP.NET Core Web API development. Understand how action methods process HTTP requests, handle routing with annotations, and return JSON-formatted responses. This lesson helps you grasp the backend request/response pipeline and how controllers work within the framework.

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Implementation of web API resources using controllers

Web API resources are implemented using controllers. Let’s have a look at the controller that the template project created by opening WeatherForecastController.cs in the Controllers folder. This contains a class called WeatherForecastController that inherits from ControllerBase with a Route annotation:

Node.js
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase {
... 
}

The annotation specifies the web API resource URL that the controller handles. The [controller] ...