MVC parameter returning null value

Question

Below is the Controller code:

public class HomeController : Controller
{
    //
    // GET: /Home/

    public string Index(string name)
    {
        return "Welcome to MVC_Demo"+name;
    }

}

and below is the Global.asax.cs codes:

public class MvcApplication : System.Web.HttpApplication
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
        );

    }

    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();

        RegisterRoutes(RouteTable.Routes);
    }
}

When I run the application and browse for (http://localhost/MVC_Demo/home/index/pradeep) it shows only, "Welcome to MVC_Demo" as the output, and not as "Welcome to MVC_Demo Pradeep" i.e the parameter name "Pradeep" is not getting displayed.

Considering me just a beginner any help would be highly appreciated.

Because you method need to be public string Index(string id) so that you match your route (which expect a parameter named id). Or you need to create a specific route. — user3559349
– user3559349, Commented Apr 17, 2018 at 5:58

rickvdbosch · Accepted Answer · 2018-04-17 06:01:03Z

2

As your route states, the default parametername is id. So either change the default parametername to be name like this

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

Or you can change the name of the parameter to be id and match the route.

public string Index(string id)
{
    return $"Welcome to MVC_Demo {id}";
}

One more solution is to specify the parametername explicitly as a QueryString parameter:

http://localhost/MVC_Demo/home/index?name=pradeep

answered Apr 17, 2018 at 6:01

rickvdbosch

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1 Comment

rickvdbosch Over a year ago

No problem @pradeep.

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