Do not throw on new way of navigation.

Author: ilonatommy

src/ProjectTemplates/Web.ProjectTemplates/content/BlazorWeb-CSharp/BlazorWeb-CSharp/Components/Account/IdentityRedirectManager.cs

@@ -7,6 +7,10 @@ internal sealed class IdentityRedirectManager(NavigationManager navigationManage
 {
     public const string StatusCookieName = "Identity.StatusMessage";
 
+    [FeatureSwitchDefinition("Microsoft.AspNetCore.Components.Endpoints.NavigationManager.EnableThrowNavigationException")]
+    private static bool _throwNavigationException =>
+        AppContext.TryGetSwitch(_enableThrowNavigationException, out var switchValue) && switchValue;
+
     private static readonly CookieBuilder StatusCookieBuilder = new()
     {
         SameSite = SameSiteMode.Strict,
@@ -15,7 +19,6 @@ internal sealed class IdentityRedirectManager(NavigationManager navigationManage
         MaxAge = TimeSpan.FromSeconds(5),
     };
 
-    [DoesNotReturn]
     public void RedirectTo(string? uri)
     {
         uri ??= "";
@@ -26,21 +29,22 @@ public void RedirectTo(string? uri)
             uri = navigationManager.ToBaseRelativePath(uri);
         }
 
-        // During static rendering, NavigateTo throws a NavigationException which is handled by the framework as a redirect.
-        // So as long as this is called from a statically rendered Identity component, the InvalidOperationException is never thrown.
         navigationManager.NavigateTo(uri);
-        throw new InvalidOperationException($"{nameof(IdentityRedirectManager)} can only be used during static rendering.");
+        if (_throwNavigationException)
+        {
+            // During static rendering, NavigateTo throws a NavigationException which is handled by the framework as a redirect.
+            // So as long as this is called from a statically rendered Identity component, the InvalidOperationException is never thrown.
+            throw new InvalidOperationException($"{nameof(IdentityRedirectManager)} can only be used during static rendering.");
+        }
     }
 
-    [DoesNotReturn]
     public void RedirectTo(string uri, Dictionary<string, object?> queryParameters)
     {
         var uriWithoutQuery = navigationManager.ToAbsoluteUri(uri).GetLeftPart(UriPartial.Path);
         var newUri = navigationManager.GetUriWithQueryParameters(uriWithoutQuery, queryParameters);
         RedirectTo(newUri);
     }
 
-    [DoesNotReturn]
     public void RedirectToWithStatus(string uri, string message, HttpContext context)
     {
         context.Response.Cookies.Append(StatusCookieName, message, StatusCookieBuilder.Build(context));
@@ -49,10 +53,8 @@ public void RedirectToWithStatus(string uri, string message, HttpContext context
 
     private string CurrentPath => navigationManager.ToAbsoluteUri(navigationManager.Uri).GetLeftPart(UriPartial.Path);
 
-    [DoesNotReturn]
     public void RedirectToCurrentPage() => RedirectTo(CurrentPath);
 
-    [DoesNotReturn]
     public void RedirectToCurrentPageWithStatus(string message, HttpContext context)
         => RedirectToWithStatus(CurrentPath, message, context);
 }