MVC Routing Null parameters error

Question

On my Index page I have the following link to the Details view:

 @Html.ActionLink("Details", "Details", new { id = item.ClubId })|

My controller is expecting an int:

public ActionResult Details(int ClubId)
{
    var club = _service.GetClub(ClubId);
    var model = AutoMapper.Mapper.Map<ClubViewModel>(club);
    return View(model);
}

Im getting this every time though:

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

I know this is something to do with routing however I have tried swapping UrlParameter.Optional to "" and making the ViewModel's ClubId nullable but the error remains.

If I rewire my controller to accept a Club object and pass in item from the Index view then everything is fine and the ClubId is populated in debug but I'm left with a stupidly large parameter list in the URL.

I don't really get what the problem is here?

There is a difference between /url/parameters and ?query=string&parameters. The former affects the routing, the latter does not. — Andrei
– Andrei, Commented Feb 9, 2015 at 16:40

Justin Niessner · Accepted Answer · 2015-02-09 16:38:38Z

2

Your controller is expecting a parameter named ClubId but you're passing a parameter called id. They need to match.

answered Feb 9, 2015 at 16:38

Justin Niessner

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1 Comment

Andrei Over a year ago

Sometimes I've experienced a weird issue with id parameter name not working at all, that is parameter was not populated when the action was called. So these should better match as ClubId

oskar132 · Accepted Answer · 2015-02-09 16:51:57Z

1

have you tried using ClubId instead of just id?

answered Feb 9, 2015 at 16:51

oskar132

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