选择路由取决于URL参数。 约束条件

Question

First of all, I need to say that I'm using T4MVC in my project. I have one method for two routes :

public virtual ActionResult List(string slug, string category, String selectedFilters)

Routes:

routes.MapRoute("ProductOnSale", "products/{slug}/{category}/onsale", MVC.Product.List());
routes.MapRoute("ProudctsList", "products/{slug}/{category}/{selectedFilters}", MVC.Product.List()
                .AddRouteValue("selectedFilters", ""));

As you can see, this is only one ActionResult for two routes. They have a different url. Example for the first route:

products/living-room-furniture/sofas/sectional-sofa

Example for the second route:

products/living-room-furniture/living-room-tables/onsale

This piece should say that I came from the another page. I need to add Boolean parameter to my method List(string slug, string category, String selectedFilters, bool onsale) and, depends on that, choose route. Is it possible to do using constraints? May anyone provide an example how to do it in this case?

Answer 1

I'm not sure if I understand your question correctly. Two cases I come accross might help you.

CASE 1 : redirect to another URL depending on the URL used to access the page.

STEP 1: Create an MVCRouteHandler

public class LandingPageRouteHandler : MvcRouteHandler { protected override IHttpHandler GetHttpHandler(RequestContext Context) { if ( Context.HttpContext.Request.Url.DnsSafeHost.ToLower().Contains("abc")) { Context.RouteData.Values["controller"] = "LandingPage"; Context.RouteData.Values["action"] = "Index"; Context.RouteData.Values["id"] = "abc"; } return base.GetHttpHandler(Context); } }

STEP 2: Add a RouteHandler

          routes.MapRoute(
                name: "Landingpage",
                url: "Landingpage/{id}/{*dummy}",
                defaults: new { controller = "Landingpage", action = "Index" }
            );

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

CASE 2 : Add a property to a controller and view depending on the url used

All controlles in my case derive from a BaseController class. In the BaseController I have :

protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
    base.OnActionExecuting(filterContext);

    //Set TenantByDomain
    var DnsSafeHost = filterContext.HttpContext.Request.Url.DnsSafeHost;
    int? TenantByDomain = null;
    if (db.Tenants.Any(x => x.DnsDomains.Contains(DnsSafeHost)))
    {
        TenantByDomain = db.Tenants.First(x => x.DnsDomains.Contains(DnsSafeHost)).Id;
    }
    ((BaseController)(filterContext.Controller)).TenantByDomain = TenantByDomain;
    filterContext.Controller.ViewBag.TenantByDomain = TenantByDomain;
}

Applied to your Question. Using the routehandler you could add an extra property indicating the original route taken and redirect both to a 3th url (! the user does not see this new url).

In the OnActionExecuting do something with the extra routevalue so that the handling can be done as desired.