fixing mvc project

src/Orchard.Mvc.Web/Modules/Orchard.Mvc.HelloWorld/Startup.cs

@@ -22,6 +22,7 @@ public Startup(IServiceProvider applicationServices,
 
         public override void ConfigureServices(IServiceCollection serviceCollection)
         {
+            serviceCollection.AddRouting();
             serviceCollection.AddMvcModules(_applicationServices);
         }
 
@@ -40,7 +41,7 @@ public override void Configure(IApplicationBuilder builder, IRouteBuilder routes
             routes.MapAreaRoute
             (
                 name: "Home",
-                areaName: "HelloWorld",
+                areaName: "Orchard.Mvc.HelloWorld",
                 template: "",
                 defaults: new { controller = "Home", action = "Index" }
             );

src/Orchard.Mvc.Web/OrchardCore.Mvc.csproj

@@ -16,6 +16,7 @@
     <ProjectReference Include="../OrchardCore/Orchard.Hosting.Console/Orchard.Hosting.Console.csproj" />
     <ProjectReference Include="../OrchardCore/Microsoft.AspNetCore.Modules/Microsoft.AspNetCore.Modules.csproj" />
     <ProjectReference Include="../OrchardCore/Microsoft.AspNetCore.Mvc.Modules/Microsoft.AspNetCore.Mvc.Modules.csproj" />
+    <ProjectReference Include="Modules\Orchard.Mvc.HelloWorld\Orchard.Mvc.HelloWorld.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="System.Linq" Version="4.3.0" />

src/OrchardCore/Microsoft.AspNetCore.Modules/Extensions/ModularServiceCollectionExtensions.cs

@@ -100,6 +100,8 @@ public static IServiceCollection AddWebHost(
                 internalServices.AddExtensionManagerHost("App_Data", "dependencies");
 
                 internalServices.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
+
+                internalServices.AddScoped<IModularTenantRouteBuilder, ModularTenantRouteBuilder>();
             });
         }
     }

src/OrchardCore/Microsoft.AspNetCore.Modules/ModularTenantRouteBuilder.cs

@@ -0,0 +1,35 @@
+using System;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Builder.Internal;
+using Microsoft.AspNetCore.Routing;
+
+namespace Microsoft.AspNetCore.Modules
+{
+    public class ModularTenantRouteBuilder : IModularTenantRouteBuilder
+    {
+        private readonly IServiceProvider _serviceProvider;
+
+        // Register one top level TenantRoute per tenant. Each instance contains all the routes
+        // for this tenant.
+        public ModularTenantRouteBuilder(IServiceProvider serviceProvider)
+        {
+            _serviceProvider = serviceProvider;
+        }
+
+        public IRouteBuilder Build()
+        {
+            IApplicationBuilder appBuilder = new ApplicationBuilder(_serviceProvider);
+
+            var routeBuilder = new RouteBuilder(appBuilder)
+            {
+            };
+
+            return routeBuilder;
+        }
+
+        public void Configure(IRouteBuilder builder)
+        {
+
+        }
+    }
+}

src/OrchardCore/Microsoft.AspNetCore.Mvc.Modules/Extensions/ModularServiceCollectionExtensions.cs

@@ -91,7 +91,8 @@ internal static IMvcCoreBuilder AddModularRazorViewEngine(this IMvcCoreBuilder b
 
         internal static void AddMvcModuleCoreServices(IServiceCollection services)
         {
-            services.AddScoped<IModularTenantRouteBuilder, ModularTenantRouteBuilder>();
+            services.Replace(
+                ServiceDescriptor.Scoped<IModularTenantRouteBuilder, ModularTenantRouteBuilder>());
 
             services.AddScoped<IViewLocationExpanderProvider, DefaultViewLocationExpanderProvider>();
             services.AddScoped<IViewLocationExpanderProvider, ModularViewLocationExpanderProvider>();