How to map querystring to action method parameters in MVC?

Question

I have a url http://localhost/Home/DomSomething?t=123&s=TX and i want to route this URL to the following action method

public class HomeController
{
   public ActionResult DoSomething(int taxYear,string state)
   {
      // do something here
   }
}

since the query string names does not match with action method's parameter name, request is not routing to the action method.

If i change the url (just for testing) to http://localhost/Home/DomSomething?taxYear=123&state=TX then its working. (But i dont have access to change the request.)

I know there is Route attribute i can apply on the action method and that can map t to taxYear and s to state.

However i am not finding the correct syntax of Route attribute for this mapping, Can someone please help?

Why not just public ActionResult DoSomething(int t,string s)? — user3559349
– user3559349, Commented Jan 31, 2017 at 23:04
You can always use Request.QueryString["t"]; inside your controller action — Girisha
– Girisha, Commented Jan 31, 2017 at 23:08
If you can change the Action's parameter names then you should just do as Stephen Muecke suggested and change the names to match the query string names — Nkosi
– Nkosi, Commented Jan 31, 2017 at 23:12
The query string has absolutely nothing at all to do with (built-in) routing. The MVC framework uses value providers to supply query string information to the MVC pipeline. You can change its behavior by creating your own value provider. See this similar question. — NightOwl888
– NightOwl888, Commented Feb 1, 2017 at 9:21

Win · Accepted Answer · 2017-02-01 00:31:40Z

Option 1

If Query String parameters are always t and s, then you can use Prefix. Note that it won't accept taxYear and state anymore.

http://localhost:10096/home/DoSomething?t=123&s=TX

public ActionResult DoSomething([Bind(Prefix = "t")] int taxYear, 
   [Bind(Prefix = "s")] string state)
{
    // do something here
}

Option 2

If you want to accept both URLs, then declare all parameters, and manually check which parameter has value -

http://localhost:10096/home/DoSomething?t=123&s=TX
http://localhost:10096/home/DoSomething?taxYear=123&state=TX

public ActionResult DoSomething(
    int? t = null, int? taxYear = null, string s = "",  string state = "")
{
    // do something here
}

Option 3

If you don't mind using third party package, you can use ActionParameterAlias. It accepts both URLs.

http://localhost:10096/home/DoSomething?t=123&s=TX
http://localhost:10096/home/DoSomething?taxYear=123&state=TX

[ParameterAlias("taxYear", "t")]
[ParameterAlias("state", "s")]
public ActionResult DoSomething(int taxYear, string state)
{
    // do something here
}

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