Asp.net-mvc – ASP.NET MVC routing – trying to have a name in the URL

asp.net-mvcasp.net-mvc-routing

I have currently the following routes:

routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.IgnoreRoute("{resource}.gif/{*pathInfo}");

MvcRoute.MappUrl("{controller}/{action}/{ID}")
    .WithDefaults(new { controller = "home", action = "index", ID = 0 })
    .WithConstraints(new { controller = "..." })
    .AddWithName("default", routes)
    .RouteHandler = new MvcRouteHandler();

MvcRoute.MappUrl("{title}/{ID}")
    .WithDefaults(new { controller = "special", action = "Index" })
    .AddWithName("view", routes)
    .RouteHandler = new MvcRouteHandler();

The SpecialController has a method: public ActionResult Index(int ID)

Whenever I point my browser to http://hostname/test/5, I get the following error:

The parameters dictionary contains a null entry for parameter 'ID' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Index(Int32)' in 'SpecialController'. To make a parameter optional its type should be either a reference type or a Nullable type.
Parameter name: parameters
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Why is that? I used the mvccontrib route debugger, and it seems that the route is accessible as expected.

Best Answer

I think you should put your custom route before the default one.

http://weblogs.asp.net/scottgu/archive/2007/12/03/asp-net-mvc-framework-part-2-url-routing.aspx

Related Solutions

R – Shortening URL params with MVC routing

On the controller change the PublicView(int? profileKey)

ANSWER TO COMMENT

Yes, but since your default value in the route is null, you need to handle it. Otherwise, change the default in your route.

MAYBE

This probably won't help, but it is worth a try. Here is the code I have my site:

        routes.MapRoute(
            "freebies",                                              // Route name
            "freebies/{page}",                           // URL with parameters
            new { controller = "Home", action = "Freebies", page = 1 }  // Parameter defaults
        );

And the link:

http://localhost/freebies/2

And this works fine.

C# – File Upload ASP.NET MVC 3.0

You don't use a file input control. Server side controls are not used in ASP.NET MVC. Checkout the following blog post which illustrates how to achieve this in ASP.NET MVC.

So you would start by creating an HTML form which would contain a file input:

@using (Html.BeginForm("Index", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="file" />
    <input type="submit" value="OK" />
}

and then you would have a controller to handle the upload:

public class HomeController : Controller
{
    // This action renders the form
    public ActionResult Index()
    {
        return View();
    }

    // This action handles the form POST and the upload
    [HttpPost]
    public ActionResult Index(HttpPostedFileBase file)
    {
        // Verify that the user selected a file
        if (file != null && file.ContentLength > 0) 
        {
            // extract only the filename
            var fileName = Path.GetFileName(file.FileName);
            // store the file inside ~/App_Data/uploads folder
            var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
            file.SaveAs(path);
        }
        // redirect back to the index action to show the form once again
        return RedirectToAction("Index");        
    }
}

Related Topic