Changing single route parameter in ActionLink

Question

I am trying to implement a language chooser which is visible on all pages.

My application currently has two routes:

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

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

And in my shared _layout.cshtml file I have the following action links:

@Html.ActionLink("English", ViewContext.RouteData.Values["action"].ToString(), new {language="en"})
@Html.ActionLink("Français", ViewContext.RouteData.Values["action"].ToString(), new {language="fr"})

The problem I am encountering is I want the {eventid} route segment preserved, but it's not applicable on every url.

On the home index page http://localhost/MySite/, the two action links are as follows:

English: http://localhost/MySite/
French: http://localhost/MySite/fr

Which is good, but on my interior page http://localhost/MySite/en/2/Donation the action links are:

English: http://localhost/MySite/en/2/Donation
French: http://localhost/MySite/fr/Donation

If I go to http://localhost/MySite/fr/2/Donation then the action links are:

English: http://localhost/MySite/en/Donation
French: http://localhost/MySite/fr/2/Donation

The problem is the change language action link does not contain the eventid 2 information.

How do I make it so both links contain the event and language information (and any other route parameters unforeseeable in the future) without having to program explicitly for them?

Your second map route needs en to be changed to fr for starters — MVCKarl
– MVCKarl, Commented Nov 30, 2012 at 2:53

Jakub · Accepted Answer · 2013-04-09 12:47:45Z

2

What you might end up using is Html.RouteLink()

In this case I'd call it like this (changed to an array if multiple languages are required):

@{
   var enRoute = new RouteValueDictionary(ViewContext.RouteData.Values);
   enRoute["language"] = "en";
   ....
}

(remember the new RouteValueDictionary(), you don't want to overwrite the existing one)

and then:

@Html.RouteLink("English", enRoute)

It's a bit nasty and you can't get around it without using the view variable (which I dislike) but you get your whole route for the link.

answered Apr 9, 2013 at 12:47

Jakub

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Ivan Josipovic · Accepted Answer · 2016-03-09 20:14:55Z

0

A inline way to use this method:

@Html.ActionLink("English", this.ViewContext.RouteData.Values["controller"].ToString(), new RouteValueDictionary(ViewContext.RouteData.Values) {["language"] = "en"})

answered Mar 9, 2016 at 20:14

Ivan Josipovic

563 bronze badges

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