Asp.net MVC URL重写操作和带有名称的ID

Question

Asp.net Mvc Url MapRoute does not recognize the rout without Action:

Error: A public action method was not found on controller

routes.MapRoute(
             "WorldWithoutAction",
             "World/{id}/{name}",
             new { id = UrlParameter.Optional, name = UrlParameter.Optional },
             new[] { "MyProject.Web.Controllers" });

Although trying this to catch World/Details but same error occurred:

routes.MapRoute(
            name: "World",
            url: "World",
            defaults: new { controller = "World", action = "Details" }
        );

What shoud I do to catch http://domain.com/world/1/australia to http://domain.com/world/details/1 ? Seems that it just accept action instead of {id} in url.

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

        routes.MapRoute(
             "Default",
             "{controller}/{action}/{id}",
             new { controller = "Home", action = "Index", id = UrlParameter.Optional },
             new[] { "MyProject.Web.Controllers" });

        routes.MapRoute(
             "Default2",
             "{controller}/{action}/{id}/{name}",
             new { controller = "Agency", action = "Show", id = UrlParameter.Optional, name = UrlParameter.Optional },
             new[] { "MyProject.Web.Controllers" });

        routes.MapRoute(
             "Default3",
             "{controller}/{action}/{id}/{name}",
             new { id = UrlParameter.Optional, name = UrlParameter.Optional },
             new[] { "MyProject.Web.Controllers" });

        routes.MapRoute(
             "WorldWithoutAction",
             "World/{id}/{name}",
             new { id = UrlParameter.Optional, name = UrlParameter.Optional, action = "Details" },
             new[] { "MyProject.Web.Controllers" });

        routes.MapRoute(
            name: "World",
            url: "World",
            defaults: new { controller = "World", action = "Details" }
        );

    }

Answer 1

You need to reorder your routes so the most specific routes are defined first. You also need to provide default values for:

• controller and action when they don't appear in the route
• Any other parameter required by the action method. (For example in a method Details(int id) id is required and so in your route you need to either add a segment {id} or a default value)

Also, your default routes won't work well with each other, you may want to rethink/simplify them. For example, you could hardcode the controller to "Agency" in default2 and combine default and default3 together.

With all these changes, your routes definition would look something like this:

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

    routes.MapRoute(
        name: "World",
        url: "World",
        defaults: new { controller = "World", action = "Details", id = 0 }
    );

    routes.MapRoute(
        "WorldWithoutAction",
        "World/{id}/{name}",
        new { controller = "World", action = "Details", id = 0, name = UrlParameter.Optional },
        new[] { "MyProject.Web.Controllers" }
    );

    routes.MapRoute(
        "DefaultAgency",
        "Agency/{action}/{id}/{name}",
        new { controller = "Agency", action = "Show", id = UrlParameter.Optional, name = UrlParameter.Optional },
        new[] { "MyProject.Web.Controllers" }
    );

    routes.MapRoute(
        "Default",
        "{controller}/{action}/{id}/{name}",
        new { controller = "Home", action = "Index", id = UrlParameter.Optional, name = UrlParameter.Optional },
        new[] { "MyProject.Web.Controllers" }
    );
}

As discussed in the chat, it might not make sense to declare the id as optional for controller actions that require a valid id to retrieve data. You might need to find another solution for having SEO friendly urls.