practice/practiceApplicaiton/RoomsPage.xaml.cs

namespace practiceApplicaiton;

public partial class RoomsPage : ContentPage
{
    private Room? _selected;

    public RoomsPage() => InitializeComponent();

    protected override async void OnAppearing()
    {
        base.OnAppearing();
        await LoadAsync();
    }

    private async Task LoadAsync()
    {
        try { RoomsList.ItemsSource = await Repository.GetRoomsAsync(); }
        catch (Exception ex) { await DisplayAlertAsync("Ошибка", ex.Message, "OK"); }
    }

    private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        _selected = e.CurrentSelection.FirstOrDefault() as Room;
        EditRatingButton.IsEnabled = _selected != null;
    }

    private async void OnEditRatingClicked(object sender, EventArgs e)
    {
        if (_selected == null) return;

        var result = await DisplayPromptAsync(
            "Рейтинг комнаты",
            $"Введите новый рейтинг для комнаты №{_selected.RoomNumber} (0.0 — 5.0):",
            initialValue: _selected.Rating.ToString("F1"),
            keyboard: Keyboard.Numeric);

        if (result == null) return;

        if (!decimal.TryParse(result.Replace(',', '.'),
            System.Globalization.NumberStyles.Any,
            System.Globalization.CultureInfo.InvariantCulture, out var rating)
            || rating < 0 || rating > 5)
        {
            await DisplayAlertAsync("Ошибка", "Рейтинг должен быть от 0.0 до 5.0", "OK");
            return;
        }

        try
        {
            await Repository.UpdateRoomRatingAsync(_selected.RoomId, rating);
            await LoadAsync();
        }
        catch (Exception ex) { await DisplayAlertAsync("Ошибка", ex.Message, "OK"); }
    }
}