ASP.NET MVC Url.Action adds current route values to generated url

Question

I have seen this question a couple of times here in SO but none of them with any acceptable answer:

ASP.NET MVC @Url.Action includes current route data
ASP.NET M

Answer 1

My application explicitly sets route values and does not want a magical value from the current request. I want to be in full control.

I have made an extension which coexists with my route library collection. Hence the single RouteValueDictionary param. (See my Route library comment at the bottom)

Here I remove any routevalues from the request prior to generating a url.

(note: for the array.contains ignorecase part, see: How can I make Array.Contains case-insensitive on a string array?)

public static string Action(this UrlHelper helper, 
                            RouteValueDictionary routeValues)
{
    RemoveRoutes(helper.RequestContext.RouteData.Values);

    string url = helper.Action(routeValues["Action"].ToString(), routeValues);
    return url;
}

public static void RemoveRoutes(RouteValueDictionary currentRouteData)
{
    List keyList = new List(currentRouteData.Keys);

    string[] ignore = new[] { "Area", "Controller", "Action" };
    foreach (string key in keyList)
    {
        if (!ignore.Contains(key, StringComparer.CurrentCultureIgnoreCase))
            currentRouteData.Remove(key);
    }
}

I have Form and ActionLink extension methods that uses the RemoveRoutes method. No helper in my mvc library uses a method that is not an extension method i have created. Thereby, all routedata is cleaned up before generating urls.

For reference I use AttributeRouting. Here is an example of one route from my route library.

public static RouteValueDictionary DisplayNews(int newsId)
{
    RouteValueDictionary route = new RouteValueDictionary();
    route["Area"] = _area;
    route["Controller"] = _controller;
    route["Action"] = "DisplayNews";
    route["newsId"] = newsId;
    return route;
}