how to pass parameter name "action" in asp.net web api

Question

Can not send parameter name "action" by url in asp.net web api 2.0.

Example:

http://host:port/controller_name?action=2&...

if you do so:

 config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{action}/{action}",
                defaults: new
                {
                    action=RouteParameter.Optional
                }
            );

method in controller:

   public HttpResponseMessage Get(int action)
    {
        return ResponseXml();
    }

gives an error message:

in the dictionary path name of the parameter "action" is contained in the URL-address more than once

How to pass parameter name "action" as a parameter, rather than the action method ?

thanks

If you want to your action param through querystring(?action=..), then you don't need to set in the route map. In your current routeTemplate, your url should be like /controllername/actionname/xyz, but if that is reqriured, why can't you change your routeTemplate to use other than action? — Karthik M R
– Karthik M R, Commented May 5, 2016 at 10:49
@Karthik M R I need to receive data strictly according to the protocol which format: host:port/controller_name?action=2&login=, first parameter should be parameter name "action" — Kamol Hakimbaev
– Kamol Hakimbaev, Commented May 5, 2016 at 11:18

Karthik M R · Accepted Answer · 2016-05-05 12:04:01Z

2

Since the name action is included in the querystring part(?action=2), no need to change the route map. The framework will bind the value to the action paramter in the action method. Remove the extra {action} in routeTemplate. And since your url format doesn't contain {action} host:port/controller_name?action=2&login=, remove {action} from routemap. So, your route map will be

config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "{controller}/{id}",
            defaults: new
            {
                id=RouteParameter.Optional
            }
        );

edited May 5, 2016 at 12:04

answered May 5, 2016 at 11:41

Karthik M R

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3 Comments

Kamol Hakimbaev Over a year ago

if you do so, receive an error: No action was found on the controller 'Values' that matches the name '2' .Because is a binding parameter value to the method controller

Karthik M R Over a year ago

remove api from routeTemplate. have updated my answer

Kamol Hakimbaev Over a year ago

its clear. Thanks. I thought that all the parameters should be strictly specified in the route.

Nkosi · Accepted Answer · 2016-05-05 11:55:32Z

You could try using Attribute Routing and include it in the route template.

//GET [controller_route]/2
[HttpGet]
[Route("{action:int}")]
public HttpResponseMessage Get(int action)
{
    return ResponseXml();
}

which will let you use the following url

http://host:port/controller_name/2

where action parameter will be mapped to 2.

Remember to enable the attribute routing during configuration.

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Attribute routing.
        config.MapHttpAttributeRoutes();

        // Convention-based routing.
        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }
}

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