c# url action with multiple parameter one is null

Question

I have a jquery $.getJson call to a controller action that returns a json.

The action accepts 3 parameters:

public async Task<ActionResult> MyAction(string id, string name, string age)
{
    .... code here     
}

and in JavaScript

$.getJson('@Url.Action("MyAction", "MyController", new { @id= Model.Id, @name=Model.Name, @age=Model.Age })')

The problem is that in the action only the Id and Name values are provided the age is null. The age value is ther. If I just display the age on the page

@Model.Age

the values is shown ... somehow is not set to the action.

The route looks like this:

routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );

Basically only the first 2 parameters are sent to action. The third one is null. I have a feeling is a route issues here, but cannot figure it out.

T McKeown · Accepted Answer · 2015-07-18 21:25:44Z

2

You are sending a JSON object to the controller, why not send 3 parameters? Otherwise your controller action really needs something like this to match your request:

public class DataClass{
   public string id;
   public string name;
   public string age;
}

Change your controller:

public async Task<ActionResult> MyAction(DataClass data)
{
   .... code here     
}

answered Jul 18, 2015 at 21:25

T McKeown

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10 Comments

T McKeown Over a year ago

then it's getting set as null

T McKeown Over a year ago

why don't you show your js Model class? Also place a debugger; line before you send the data to verify.

user2818430 Over a year ago

There is actually no data that is sent but just a get issues to that url with the parameters. The @Url.Action helper formats the url but the parameters are received from the model. Actually I checked it with Fiddler and the request (url) is formatted properly. The problem is in the MVC side.

user2818430 Over a year ago

Here is the url from fiddler: https://localhost:44314/MyController/MyAction/2f9d59d1-92ae-4028-b3d7-e08c2ebf0123?name=Jhon&age=23&_=1437254972485

user2818430 Over a year ago

As you can see all parameters are there: id, name and age. on the mvc side age only is null

|

user2818430 · Accepted Answer · 2015-07-18 21:52:20Z

I actually solved this by adding a new route to my RouteConfig.cs class:

Now it looks like this. Notice the new name and age parameters:

public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");


        routes.MapRoute(
            name: "UserRoute",
            url: "{
                     controller}/{action}/{id}/{name}/{age}",
                     defaults: new { 
                                    controller = "Home", 
                                    action = "Index", 
                                    id = UrlParameter.Optional, 
                                    name = UrlParameter.Optional, 
                                    age = UrlParameter.Optional }
        );

        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { 
                             controller = "Home", 
                             action = "Index", 
                             id = UrlParameter.Optional }
        );
    }
}

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