ASP.NET Core 3.0 not routing correctly

Question

I have recently upgraded an existing ASP.NET Core 2.2 web app to 3.0 . Everything now compiles. However when I go to run the application I am greeted with a directory listing instead of the login page.

Our app uses Razor pages as opposed to full blown MVC. Reading around the many changes in ASP.NET Core 3.0 I can see that the way in which routing is implemented has changed substantially.

Previously in the ConfigureServices we had the following.

services.AddMvc()
                .AddRazorPagesOptions(options => { options.Conventions.AuthorizeFolder("/"); });

And in the Configure method we had this.

app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller}/{action=Index}/{id?}");
            });

This all worked fine. What changes are needed to get the app to route correctly now that we have upgraded to ASP.NET Core 3.0.

Answer 1

In .Net Core 3 & .Net Core 3.1 you have to delete services.AddMvc().AddRazorPagesOptions(options => { options.Conventions.AuthorizeFolder("/"); }); and services.AddMvc(); from ConfigureServices :

Then add services.AddRazorPages();

In Configure add:

app.UseRouting();

app.UseEndpoints(endpoints => endpoints.MapRazorPages());

app.UseEndpoints(endpoints => { endpoints.MapControllerRoute("default", "{controller=Home}/{action=Index}/{id?}"); });

Finally your code will be like this:

  public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
            {
                services.AddRazorPages();
            }
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
            {
                app.UseRouting();
                app.UseEndpoints(endpoints => endpoints.MapRazorPages());
                app.UseEndpoints(endpoints =>
                                             {
                                               endpoints.MapControllerRoute("default", " 
                                               {controller=Home}/{action=Index}/{id?}");
                                              });                 
            }
    }

To get more information take a look at Microsof documentation

Answer 2

You have to define the default controller on the default route. For sample:

app.UseMvc(routes =>
           {
               routes.MapRoute(
                   name: "default",
                   template: "{controller=Home}/{action=Index}/{id?}");
           });

I am not sure if your default controller should be Home but define it on the template and it will work when the user with an empty route access the applicaton.