CODEWITHSUNDEEP
c#asp.net-mvc
user859385
user859385

Reputation: 627

How does the application know the controller class when i do an ActionLink? ASP mvc

When i do @Html.ActionLink("About us", "About", "Home"), how does the application know that the controller file is in Controllers\HomeController.cs? I see controller folders separated such as 'Views\Home', 'Views\Booking' etc. However, how does it know to look for Controllers\HomeController.cs when the controller name specified was Home? My code is perfectly working due to visual studio's generated files. However, i would like to know what is the theory behind it. Please explain, thank you.

Here is my route config,

    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );
    }

here is my HomeController,

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    public ActionResult About()
    {            
        return View();
    }
}

Upvotes: 0

Views: 95

Answers (1)

mBrice1024
mBrice1024

Reputation: 838

Essentially, it's all .net mvc doing this. So when you feed it that ActionLink, it knows that "Home" is the Controller which houses a function named About.

When it's time to invoke the function to render something; the DefaultControllerFactory .net mvc uses will be start enough to figure out that the given controller is missing the word "Controller", so it will append it prior to invocation.

There's a really nice guide I've used in the past about how to override the DefaultControllerFactory: https://www.codeproject.com/Articles/599189/DefaultControllerFactory-in-ASP-NET-MVC

Which might give you a better sense of what's going on under the hood :)

Upvotes: 1

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