Fixed Blog sample Razor pages (#326)

Author: ivaylokenov

samples/Blog/Blog.Web/Infrastructure/ApplicationBuilderExtensions.cs

@@ -27,6 +27,8 @@ public static IApplicationBuilder UseMvcWithAreas(this IApplicationBuilder app)
                     name: "areas",
                     pattern: "{area:exists}/{controller=Home}/{action=Index}/{id?}"
                 );
+
+                routes.MapRazorPages();
             });
 
         public static async Task<IApplicationBuilder> SeedDataAsync(this IApplicationBuilder app)

samples/Blog/Blog.Web/Startup.cs

@@ -61,9 +61,11 @@ public void ConfigureServices(IServiceCollection services)
                 .AddTransient<IDateTimeProvider, DateTimeProvider>();
 
             services
-                .AddMvc(options => options
+                .AddControllersWithViews(options => options
                     .AddAutoValidateAntiforgeryToken())
                 .SetCompatibilityVersion(CompatibilityVersion.Version_3_0);
+
+            services.AddRazorPages();
         }
 
         public void Configure(IApplicationBuilder app, IWebHostEnvironment env)