Attribute Routing in ASP.NET Core MVC

 using Microsoft.AspNetCore.Mvc;

namespace RoutingWithoutMVC.Controllers

{

    [Route("[controller]/[action]")]

    public class HomeController : Controller

    {

        [Route("")]

        [Route("~/")]

        [Route("~/Home")]

        public IActionResult Index()

        {

            return View();

        }

        //public IActionResult Data()

        //{

        //    return View("~/Views/Home/Index.cshtml");

        //}

        public IActionResult About()

        {

            return View();

        }

        [Route("{id?}")]

        public int Details(int? id)

        {

            return id ?? 1;

        }

    }

}

Above File is RoutingWithoutMVC\Controllers\HomeController.cs File

using Microsoft.AspNetCore.Mvc;

namespace RoutingWithoutMVC.Controllers

{

    public class UserController : Controller

    {

        public IActionResult Index()

        {

            return View();

        }

    }

}

Above File is RoutingWithoutMVC\Controllers\UserController.cs File

@{

    ViewData["Title"] = "About";

}

<h1>About From Home Controller</h1>

Above File is RoutingWithoutMVC\Views\Home\About.cshtml

@{

    ViewData["Title"] = "Index";

}

<h1>Index View From Home Controller</h1>

Above File is RoutingWithoutMVC\Views\Home\Index.cshtml

@{

    ViewData["Title"] = "Index";

}

<h1>Index View From User Controller</h1>

Above File is RoutingWithoutMVC\Views\User\Index.cshtml

namespace RoutingWithoutMVC

{

    public class Program

    {

        public static void Main(string[] args)

        {

            var builder = WebApplication.CreateBuilder(args);

            builder.Services.AddControllersWithViews();

            var app = builder.Build();

            //app.MapGet("/", () => "Hello World!");

            //app.MapDefaultControllerRoute();    //this middleware will call only HomeController and its indexAction method

            //Below is convention based routing

            //app.MapControllerRoute(

            //    name:"default",

            //    pattern:"{controller=Home}/{action=About}/{id?}"

            //    //pattern:"{controller=User}/{action=Index}/{id?}"

            //    //pattern:"{controller=Home}/{action=Index}/{id?}"

            //    );

            //Below is Attribute based routing

            app.MapControllers();   //Implementing Attribute based routing

            app.Run();

        }

    }

}

Above File is RoutingWithoutMVC\Program.cs File