转换器未连接到 PropertyChanged 事件

Question

我有一个层次结构绑定到实体框架模型的树视图。下面的矩形仅适用于初始加载。并且当我触发 Propertychanged 事件时不更新其颜色等。<HierarchicalDataTemplate ItemsSource="{Binding tblLines}">    <StackPanel Orientation="Horizontal" Margin="2">        <Image Height="15" Margin="4" x:Name="imgTreeProject" Source="/DES STUDIO PR;component/Resources/Images/folder_closed.png"/>        <TextBlock Text="{Binding Name}" Margin ="8" TextAlignment="Center" VerticalAlignment="Center" HorizontalAlignment="Center"/>        <Rectangle Name="X" Width="10" Height="10" Fill="{Binding Path=.,Converter={StaticResource CheckoutConverter},UpdateSourceTrigger=PropertyChanged}" ToolTip="{Binding Path=.,Converter={StaticResource CheckoutPersonConverter},UpdateSourceTrigger=PropertyChanged}" ToolTipService.IsEnabled="{Binding Path=.,Converter={StaticResource CheckoutToolTipVis},UpdateSourceTrigger=PropertyChanged}"/>    </StackPanel>这是我的转换器：public class CheckoutConverter : IValueConverter{    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)    {        if (value is TblBase)        {            var Baseentity = value as TblBase;            if (Baseentity.COID == MainWindow.LocalUser.ID)            {                return Brushes.Green;            }            else if ((Baseentity.COID == 0) || (Baseentity.COID == null))            {                return Brushes.Transparent;            }            else if (Baseentity.COID != 0)            {                return Brushes.Black;            }        }        return Brushes.Black;    }    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)    {        throw new NotImplementedException();    }}属性更改事件适用于不使用转换器的树视图绑定，因此我不确定我缺少什么。