CODEWITHSUNDEEP
c#asp.net-mvct4mvc
rafasoares
rafasoares

Reputation: 425

T4MVC - Dealing with optional parameters

I'm using .NET 3.5, MVC 2 and T4MVC 2.6.42...

I have the following action:

public virtual ActionResult Index(string id, int page = 1)

And the following route:

routes.MapRoute(
    "Products", // Route name
    "Products/{id}", // URL with parameters
    new { controller = "Products", action = "Index", id = UrlParameter.Optional, page = UrlParameter.Optional }, // Parameter defaults
    new string[] { "Web.Controllers" }
);

But when I try to call MVC.Products.Index("anything") I get a "No overload for method 'Index' takes '1' arguments" exception. Calling MVC.Products.Index(), however, works.

Shouldn't I be able to omit the "page" parameter since it defaults to '1'?

Note: I've tried defaulting the page parameter to 1 in the route, didn't work.

Note 2: Also tried the [Optional] Attribute with no success.

Upvotes: 3

Views: 1610

Answers (3)

rafasoares
rafasoares

Reputation: 425

Like I said in my response to Kirk Woll above, apparently, optional parameters aren't supported in C# 3.0

I solved the problem by creating an overload and using the NonAction Attribute:

[NonAction]
public ActionResult Index(string id)
{
    return Index(id, 1);
}

Then MVC.Products.Index("foo") works like a charm, with any C# version.

Upvotes: 0

David Ebbo
David Ebbo

Reputation: 43183

Though you figured out the problem with the wrong C# version, for future reference there is a way of doing this. You can write:

MVC.Products.Index().AddRouteValue("id", "anything");

This lets you add the value for individual param in addition to what the method call passes in.

Upvotes: 5

VinnyG
VinnyG

Reputation: 6911

Just make your int nullable and it will work.

public virtual ActionResult Index(string id, int? page = 1)

Upvotes: 0

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