MVC3 Parameters in Controller Methods

Question

I have a controller called AuctionsController with a method

public ActionResult BidsByAuction(int auctionId, int page = 1)

When I navigate to /Auctions/BidsByAuction/38 I get the following error:

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

What is going wrong here?

Erik Funkenbusch · Accepted Answer · 2011-12-08 18:26:27Z

6

Did you create a cutom route for your method that takes an AuctionID as a parameter? If not, then by default, the parameter is called "id".

If you want auctionid, then you need to make a new route that sets the name to auctionid.

Not entirely sure that will fix your problem, since there may be a problem with the optional parameter as well, but fix this one and see what you get.

answered Dec 8, 2011 at 18:26

Erik Funkenbusch

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3 Comments

Sachin Kainth Over a year ago

I didn't create a custom route because there are other methods that don't seem to have a custom route but are using auctionId as a parameter and they work fine.

Erik Funkenbusch Over a year ago

@Sachin - Are you by any chance passing AuctionId as a form variable? If you have it in your form, then the id will be ignored

Erik Funkenbusch Over a year ago

@Sachin - Also, your other methods may be adding a querystring parameter called auctionId, rather than using the route parameter of /<id>

Romias · Accepted Answer · 2011-12-08 18:58:01Z

0

The "38" is mapped to a the default route last parameter {id}. The second parameter should be optional to not being taking into account if it is not provided in the query string.

answered Dec 8, 2011 at 18:58

Romias

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Comments

Sachin Kainth · Accepted Answer · 2011-12-09 09:22:52Z

0

Thanks everyone. School boy error. You were all right, I should have used id as the parameter name in the controller method. That is why I got this error.

answered Dec 9, 2011 at 9:22

Sachin Kainth

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