Additional Blazor WASM preview updates (#17968)

Author: guardrex

aspnetcore/includes/blazor-security/app-component.md

@@ -11,7 +11,17 @@ The `App` component (*App.razor*) is similar to the `App` component found in Bla
             <AuthorizeRouteView RouteData="@routeData" 
                 DefaultLayout="@typeof(MainLayout)">
                 <NotAuthorized>
-                    <RedirectToLogin />
+                    @if (!context.User.Identity.IsAuthenticated)
+                    {
+                        <RedirectToLogin />
+                    }
+                    else
+                    {
+                        <p>
+                            You are not authorized to access 
+                            this resource.
+                        </p>
+                    }
                 </NotAuthorized>
             </AuthorizeRouteView>
         </Found>

aspnetcore/includes/blazor-security/redirecttologin-component.md

@@ -9,7 +9,8 @@ The `RedirectToLogin` component (*Shared/RedirectToLogin.razor*):
 @code {
     protected override void OnInitialized()
     {
-        Navigation.NavigateTo($"authentication/login?returnUrl={Navigation.Uri}");
+        Navigation.NavigateTo(
+            $"authentication/login?returnUrl={Uri.EscapeDataString(Navigation.Uri)}");
     }
 }
 ```