ASP.net MVC routing with optional first parameter

Question

I need to provide following functionality for one of the web sites.

http://www.example.com/[sponsor]/{controller}/{action}

Depending on the

Answer 1

In my case, I've resolved this issue using the following two routers:

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

    routes.MapRoute(
        name: "MultiCulture",
        url: "{culture}/{controller}/{action}",
        defaults: new { controller = "Home", action = "Index" },
        constraints: new { culture = new CultureConstraint(CultureFactory.All.Select(item => item.UrlPrefix).ToArray()) }
    ).RouteHandler = new MultiCultureMvcRouteHandler();

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

Where CultureConstraint class looks like below:

public class CultureConstraint : IRouteConstraint
{
  private readonly string[] values;

  public CultureConstraint(params string[] values)
  {
    this.values = values;
  }

  public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary routeValues, RouteDirection routeDirection)
  {
    string value = routeValues[parameterName].ToString();

    return this.values.Contains(value);
  }
}

And MultiCultureMvcRouteHandler like this:

public class MultiCultureMvcRouteHandler : MvcRouteHandler
{
  protected override IHttpHandler GetHttpHandler(System.Web.Routing.RequestContext requestContext)
  {
    var culture = CultureManager.GetCulture(requestContext.RouteData);

    if (culture != null)
    {
      var cultureInfo = new CultureInfo(culture.Name);

      Thread.CurrentThread.CurrentUICulture = cultureInfo;
      Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(cultureInfo.Name);
    }

    return base.GetHttpHandler(requestContext);
  }
}