Default-Route for root of application

问题:

How can I tell my mvc-application to route to a specific Controller and Action when they are not specified?

When debugging http://localhost:54500/ should route to http://localhost:54500/Home/Index.

Currently I have:

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

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

But this always throws

The view 'Index' or its master was not found or no view engine supports the searched locations

Edit #1

It should redirect/route to an View which resides in a Area called Home. Just want to clarify, that there is a Controller and an Area which both are named Home.

The config for the area is:

public override void RegisterArea(AreaRegistrationContext context)
{
    context.MapRoute(
        "Home_default",
        "Home/{controller}/{action}/{id}",
        new {action = "Index", id = UrlParameter.Optional}
        );
}

回答1:

When debugging http://localhost:54500/ should route to http://localhost:54500/Home/Index.

Actually, the way you have it configured, http://localhost:54500/ will route to the HomeController.Index method, not another URL.

The view 'Index' or its master was not found or no view engine supports the searched locations

This error indicates that routing succeeded, but the controller returned the path of a view that does not exist.

Since you also mentioned you are using an Area and have posted your configuration, it is clear what is happening. Your config is run in this order:

public override void RegisterArea(AreaRegistrationContext context)
{
    context.MapRoute(
        "Home_default",
        "Home/{controller}/{action}/{id}",
        new {action = "Index", id = UrlParameter.Optional}
        );
}

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

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

So, if you pass the URL http://localhost:54500/, the Area route will miss (because it doesn't start with /Home) and it will match the Root route. This Root route does not route to your Area. There are 2 ways to fix this.

Option 1 - Add the Root Route to the Home Area

public override void RegisterArea(AreaRegistrationContext context)
{
    context.MapRoute(
        "Root",
        "",
        new { controller = "Home", action = "Index" }
        );

    context.MapRoute(
        "Home_default",
        "Home/{controller}/{action}/{id}",
        new {action = "Index", id = UrlParameter.Optional}
        );
}

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

Option 2 - Set the DataToken to indicate the Home Area

public override void RegisterArea(AreaRegistrationContext context)
{
    context.MapRoute(
        "Home_default",
        "Home/{controller}/{action}/{id}",
        new {action = "Index", id = UrlParameter.Optional}
        );
}

routes.MapRoute(
    name: "Root",
    url: "",
    defaults: new { controller = "Home", action = "Index" }
    ).DataTokens["area"] = "Home";

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

回答2:

In Core 1.0.1 you can do this in Startup.cs:

 public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            app.UseMvc(routes =>
            {
                routes.MapRoute(name: "areaRoute",
                 template: "{area:exists}/{controller=Home}/{action=Index}");

                routes.MapRoute(
                    name: "default",
                   // template: "{controller=Home}/{action=Index}");
                   template: "{area=MyArea}/{controller=Home}/{action=Index}");
            });
        }