Asp.net MVC 5 Attribute Routing Constraint

Question

Looking at the help Attribute Routing in ASP.NET MVC 5 it is easy to see how to constraint a parameter as below:

[Route("edit/{promoId:int?}")]
public ActionResult Edit(int? promoId) { … }

So this route will only accept promoId with int values or empty.

Some valid URLs for this route would be:

/promotions/edit/5
/promotions/edit/

But how to set a RouteAttribute to accept "/promotions/edit/promoId=5"?

Jeric Cruz · Accepted Answer · 2018-03-28 01:19:29Z

2

You try to set it in RouteConfig.cs in your App_Start folder by pointing that kind of URL to your action.

routes.MapRoute(
           name: "Edit",
           url: "{controller}/{action}/promoId={promoId}",
           defaults: new { controller = "Promotions", action = "Edit", promoId = UrlParameter.Optional }
);

answered Mar 28, 2018 at 1:19

Jeric Cruz

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5 Comments

mqueirozcorreia Over a year ago

The problem with this is that if you have promoId as Int type, you receive an error if the url is trying to pass a string. I'm trying to avoid this error for google crawler.

Jeric Cruz Over a year ago

It will not be routed to this URL since it needs to have an integer. try to test this using PostMan or Telerik Fiddler

mqueirozcorreia Over a year ago

It works! The only thing different from you comment is that the controller action is called when the parameter type is different, but no value is passed to it, since it is int? The test is here: github.com/mqueirozcorreia/AspnetMVCRouteTest

Stefan Over a year ago

@mqueirozcorreia: be advised; although this is a nice way to get your result, the url format is not really common. Usually the ? querystring marker is used or parameters are sepperated in a www.example.org/something/promoId/someotherIdperhaps/ like format

Jeric Cruz Over a year ago

@mqueirozcorreia well, at least you are getting the correct route. It is up to the consumer/user of your API to parse the result. Happy to help, good luck to your project.

Stefan · Accepted Answer · 2018-03-28 08:40:43Z

2

Actually, I think the url should be in this format:

/promotions/edit?promoId=5

Note the ?. It's the beginning of the query string marker.

It should be possible to do it this way:

[Route("edit")]
public ActionResult Edit([FromUri]int promoId)
{
    ...
}

edited Mar 28, 2018 at 8:40

answered Mar 27, 2018 at 23:26

Stefan

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5 Comments

Hussein Salman Over a year ago

why promoId is not int?

mqueirozcorreia Over a year ago

I can see you idea to convert promoId from string to int. I think it works, but should not be better to use constraint? I have tried using two routes, as below: [Route("edit/promoId={promoId:int?}")] [Route("edit/{promoId:int?}")] I can use promoId as integer and optional. What do you think?

Stefan Over a year ago

@Coding: sorry, my typo bad

Stefan Over a year ago

@mqueirozcorreia: sorry, I meant int; It was late in the evening for me ;-)

mqueirozcorreia Over a year ago

Asp.net MVC has a equivalent to [FromUri] as the answer below: stackoverflow.com/a/28769621/3424212 But we get error when the promoId is not an error. The test is here: github.com/mqueirozcorreia/AspnetMVCRouteTest

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