Category: Technology

Controllers

The controller is responsible for the request made by the browser, each request is mapped to a particular controller.

The controller can return a view or redirect to another controller.

The controller is just a class derived from the base System.Web.Mvc.Controller class.

Controller Actions

Action is a method on a controller which gets called when you enter a URL in the browser address.

A controller action needs to be a public method of a controller class.

Controller action methods cannot be overloaded.

Action Results

A controller returns an action result in response to the browser request.

ViewResult – Represents HTML and markup.

EmptyResult – Represents no result.

RedirectResult – Represents a redirection to a new URL.

JsonResult – Represents a JavaScript Object Notation result that can be used in an AJAX application.

JavaScriptResult – Represents a JavaScript script.

ContentResult – Represents a text result.

FileContentResult – Represents a downloadable file (with the binary content).

FilePathResult – Represents a downloadable file (with a path).

FileStreamResult – Represents a downloadable file (with a file stream).

An action result is not passed directly instead the following is passed:

View – Returns a ViewResult action result.

namespace MvcApplication1.Controllers
{
    public class BookController : Controller
    {
        public ActionResult Index()
        {
            // Add action logic here
            return View();
        }
    }
}

Redirect – Returns a RedirectResult action result.

RedirectToAction – Returns a RedirectToRouteResult action result.

using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    public class CustomerController : Controller
    {
        public ActionResult Details(int? id)
        {
            if (!id.HasValue)
                return RedirectToAction("Index");

            return View();
        }
    }
}

RedirectToRoute – Returns a RedirectToRouteResult action result.

Json – Returns a JsonResult action result.

JavaScriptResult – Returns a JavaScriptResult.

Content – Returns a ContentResult action result.

using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    public class StatusController : Controller
    {
        public ActionResult Index()
        {
            return Content("Hello World!");
        }
    }
}

File – Returns a FileContentResult, FilePathResult, or FileStreamResult depending on the parameters passed to the method.

HttpUnauthorizedResult – forces the user to login.

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