How do I correctly setup Hot Reload for markup?

[KVINTH]

Hello,

I am trying out Maui.Markup and saw the docs about C# Hot Reload which I am trying to get working.

I am using the latest VS2022 - 17.13.5
I am using the default project setup for a MAUI application
I have only installed the Maui.Markup package thus far, but was unable to install the latest version as there was a dependency mismatch, so I am using the following:

<PackageReference Include="CommunityToolkit.Maui" Version="9.1.1" />
<PackageReference Include="CommunityToolkit.Maui.Markup" Version="5.1.0" />
<PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="9.0.0" />

I deleted MainPage.xaml.cs and MainPage.xaml and replaced it with the Maui.Markup example:

    public partial class MainPage : ContentPage
    {
        private enum Row { TextEntry }
        private enum Column { Description, Input }
        public MainPage()
        {
            Content = new Grid
            {
                RowDefinitions = Rows.Define(
                    (Row.TextEntry, 36)
                ),

                ColumnDefinitions = Columns.Define(
                    (Column.Description, Star),
                    (Column.Input, Stars(2))
                ),

                Children =
                {
                    new Label()
                        .Text("Customer Name:")
                        .Row(Row.TextEntry).Column(Column.Description),

                    new Entry
                    {
                        Keyboard = Keyboard.Numeric,
                        BackgroundColor = Colors.AliceBlue,
                    }.Row(Row.TextEntry).Column(Column.Input)
                        .FontSize(15)
                        .Placeholder("Enter name")
                        .TextColor(Colors.Black)
                        .Height(44)
                        .Margin(6, 6)
                }
            };
        }
    }

I implemented the example HotReloadHandler.cs from which the only missing piece was the AppShell.GetRoute() method which I ended up implementing like so:

    public partial class AppShell : Shell
    {
        private static readonly Dictionary<Type, string> _routes = new();
        public AppShell()
        {
            InitializeComponent();
        }

        static AppShell()
        {
            // Get all types in the current assembly that are assignable to Page.
            var pageTypes = typeof(AppShell).Assembly.GetTypes()
                .Where(t => typeof(Page).IsAssignableFrom(t) && !t.IsAbstract);

            foreach (var pageType in pageTypes)
            {
                // Generate a default route based on the type name.
                // You can replace this with any convention or custom attribute logic.
                var route = pageType.Name.ToLowerInvariant();

                // Add the mapping if it doesn't already exist.
                if (!_routes.ContainsKey(pageType))
                {
                    _routes.Add(pageType, route);

                    // Register the route with Shell.
                    Routing.RegisterRoute(route, pageType);
                }
            }
        }

        // This method is called by the Hot Reload handler to resolve a page type to its route.
        public static string GetRoute(Type pageType)
        {
            if (_routes.TryGetValue(pageType, out var route))
            {
                return route;
            }
            else
            {
                // Fallback: if for some reason the type wasn't registered during the static scan,
                // create a route using a default naming convention, register it, and return it.
                route = pageType.Name.ToLowerInvariant();
                _routes[pageType] = route;
                Routing.RegisterRoute(route, pageType);
                return route;
            }
        }
    }

The issue I am facing is that when I change something in MainPage.cs and hot reload, the app crashes when reaching this part of the HotReloadHandler OnHotReload method

  await currentPage.Dispatcher.DispatchAsync(async () =>
  {
      await shell.GoToAsync(currentPageShellRoute, false);
      shell.Navigation.RemovePage(visiblePage);
  });

with debug log
[libc] Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x1 in tid 28231 (ame.testmauiapp), pid 28231 (ame.testmauiapp)

Any ideas on what I must do to fix this?

Apologies if I have not provided enough context, this is my first time asking a question like this, and I thank you in advance for any guidance given.

[kayverhaegh]

I am also running into this problem. A fix or help would be nice.