CODEWITHSUNDEEP
asp.net-mvcuri
saklo
saklo

Reputation: 111

MVC URI parameter

Controller Action method:

public ActionResult Details(int key)
{
    CustomerContext customerContext = new CustomerContext();
    var customer = customerContext.Customers.Single(c => c.CustomerKey == key);
    return View(customer);
}

Registered Routes:

routes.MapRoute(
           name: "Details",
           url: "{controller}/{action}/{key}",
           defaults: new { controller = "Customer", action = "Details", key = UrlParameter.Optional } );

When I use this uri :

     http://localhost/Lab100_1/customer/details?key=11000

I get the proper customer details... however

When I use this uri : 

 http://localhost/Lab100_1/customer/details/11000

I get this error:

The parameters dictionary contains a null entry for parameter 'key' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Details(Int32)' in 'Lab100_1.Controllers.CustomerController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.

What I already tried : in then route config: defaults (passed a default value): 

 new { controller = "Customer", action = "Details", key = 0}

in the controller action method made the parameter nullable:

public ActionResult Details(int? key)

however I get the same error - I have a feeling if passing the parameter as query string works... then why passing it as URI parameter is not working...??? I have the route config in place... any help is much appreciated... thanks

Upvotes: 1

Views: 2218

Answers (1)

ramiramilu
ramiramilu

Reputation: 17182

I think your config is below the Default Route config. You should get it as first priority than the default route. So your route config should be like this -

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

        routes.MapRoute(
            name: "Default1",
            url: "{controller}/{action}/{key}",
            defaults: new { controller = "Customer", action = "Details", key = UrlParameter.Optional },
            constraints: new { key = @"\d+" } 
        );

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

Then it should work. UPDATED: Use Constraint.

Upvotes: 1

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