矩形条不显示为不同的颜色或根本不显示

问：

我希望条形图根据评级显示为不同的颜色。我还希望我的转换是否能按预期实际工作，而不是给我一个错误。

我的转换器不工作，我无法看到基于评级绑定的颜色变化？

RatingPage.xaml

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="RatingAgency.Views.EventsPage"
             xmlns:local="clr-namespace:RatingAgency.ViewModels"
             BackgroundColor="DarkBlue">
    <ContentPage.BindingContext>
        <local:RatingViewModel />
    </ContentPage.BindingContext>
    <ContentPage.Resources>
        <local:RatingConverter x:Key="RatingColorChange" />
    </ContentPage.Resources>
          <StackLayout Style="{StaticResource Bars}">
            <Rectangle VerticalOptions="End" Margin="2,0,0,0" WidthRequest="5" HeightRequest="5"         Fill="{Binding Rating, Converter={StaticResource RatingColorChange}}"/> 
            <Rectangle VerticalOptions="End" Margin="2,0,0,0" WidthRequest="5" HeightRequest="10" Fill="{Binding Rating, Converter={StaticResource RatingColorChange}}"/>
             <Rectangle VerticalOptions="End" Margin="2,0,0,0" WidthRequest="5" HeightRequest="15" Fill="{Binding Rating, Converter={StaticResource RatingColorChange}}"/>
          </StackLayout>
</ContentPage>

RatingView模型

命名空间 RatingAgency.ViewModels { 公共类 RatingViewModel： ViewModelBase {

    public List<Event> Events
    {
        get { return events; }
        set { events = value; OnPropertyChanged(); }
    }

    public ICommand ButtonClickedCommand { get; }

    /// <summary>
    /// Constructor
    /// </summary>
    public RatingViewModel()
    {

    }

    /// <summary>
    /// Rating Convert to color
    /// </summary>
    public class RatingConverter : IValueConverter, IMarkupExtension
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null)
            {
                double rate;
                double.TryParse(value.ToString(), out rate);
                if (rate >= 66)
                {
                    return Brush.Green;
                }
                else if (rate >= 60)
                {
                    return Brush.Green;
                }
                else if (rate >= 54.5)
                {
                    return Brush.Orange;
                }
                else if (rate <= 54.3)
                {
                    return Brush.Red;
                }
            }
            return Brush.Red;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }

        public object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
    }  
  }
}

严重性代码说明 项目文件行抑制状态 错误XLS0414找不到类型“local：RatingConverter”。验证是否缺少程序集引用，以及是否已生成所有引用的程序集。MauiService C：\Users\johnd\Documents\MauiService\Views\RatingPage.xaml 12