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Controllers in ASP.NET Core MVC

Controllers in ASP.NET Core MVC are responsible for handling incoming HTTP requests and returning a response to the client. In this page, we will discuss the basics of creating and working with controllers in an ASP.NET Core MVC application.

Syntax

Controllers in ASP.NET Core MVC are composed of public methods called Action methods. Action methods are responsible for handling incoming requests and returning a response. Here's the basic syntax for creating an action method:

public IActionResult MyActionMethod()
{
    // code to handle the request
    return View();
}

Example

Here's an example of a simple controller with two action methods:

using Microsoft.AspNetCore.Mvc;

namespace MyApp.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }

        public IActionResult About()
        {
            ViewData["Message"] = "Your application description page.";

            return View();
        }
    }
}

In this example, we have a controller named HomeController with two action methods: Index and About.

Explanation

Controllers in ASP.NET Core MVC are responsible for handling HTTP requests and returning responses. When a request is made to your application, ASP.NET Core MVC will use a routing mechanism to determine which action method should handle the request.

Action methods can return a variety of results, including ViewResult, JsonResult, RedirectResult, and more. The result returned by the action method is used to create the HTTP response that is sent back to the client.

Use

A controller is a critical component of an ASP.NET Core MVC application as it serves as the entry point for handling incoming requests. Controllers can be used to perform a variety of tasks, including:

  • Retrieving data from a data source
  • Displaying data in a view
  • Accepting data from a form and updating a data source
  • Redirecting to another page or action method

Important Points

  • Controllers in ASP.NET Core MVC are responsible for handling incoming HTTP requests and returning responses.
  • Action methods are public methods in a controller that handle incoming requests and return a result.
  • Action methods can return a variety of results, including ViewResult, JsonResult, RedirectResult, and more.

Summary

In this page, we discussed the basics of creating and working with controllers in an ASP.NET Core MVC application. We covered the syntax, example, explanation, use, and important points of controllers in ASP.NET Core MVC. Understanding controllers is essential to building robust and effective web applications in ASP.NET Core MVC.

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