将 ViewModel 中的数据绑定到控件模板的元素

Question

我正在尝试通过在app.xaml文件中app.xaml自定义样式来创建自定义日历样式，并将其绑定到mainwindow.xaml的日历，此主窗口附加到ViewModel ，其中包含用于整个应用程序 ui 设计的画笔值。 一切正常，除非尝试将画笔 ex {Binding AccentRestBrush}的值绑定到CalendarDayButton的组件样式，如CalendarDayButton .. 因为它不应用绑定到它的数据的值。 这是代码：

class ViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private void UpdateProperty(string name)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(name));
    }

    public string BackgroundBrush { get { return new Colors().BackgroundBrush(); } }
    public string CardBrush { get { return new Colors().CardBrush(); } }
    public string ElementRestBrush { get { return new Colors().ElementRestBrush(); } }
    public string ElementHoverBrush { get { return new Colors().ElementHoverBrush(); } }
    public string AccentRestBrush { get { return new Colors().AccentRestBrush(); } }
    public string AccentHoverBrush { get { return new Colors().AccentHoverBrush(); } }
    public string ForegroundBrush { get { return new Colors().ForegroundBrush(); } }
    public string ShadowBrush { get { return new Colors().ShadowBrush(); } }
    public Window Window
    {
        set
        {
            if (value != null)
            {
                 Properties.Settings.Default.PropertyChanged += (sender, e) =>
                {
                    Properties.Settings.Default.Save();
                    UpdateProperty(nameof(BackgroundBrush));
                    UpdateProperty(nameof(CardBrush));
                    UpdateProperty(nameof(ElementRestBrush));
                    UpdateProperty(nameof(ElementHoverBrush));
                    UpdateProperty(nameof(AccentRestBrush));
                    UpdateProperty(nameof(AccentHoverBrush));
                    UpdateProperty(nameof(ForegroundBrush));
                        UpdateProperty(nameof(ShadowBrush));
                    };
                }
            }
        }
    }

---

ViewModel WindowViewModel = new()
{
    Window = this,
};
this.DataContext = WindowViewModel;

---

它在这里不起作用

    <Style x:Key="CalendarDayButtonStyle" TargetType="CalendarDayButton">
        <Setter Property="Width" Value="30"/>
        <Setter Property="Height" Value="30"/>
        <Setter Property="FontSize" Value="15"/>
        **<Setter Property="Background" Value="{Binding AccentRestBrush}"/>**
        <Setter Property="HorizontalContentAlignment" Value="Center"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>

---

但在这里工作正常

<Style x:Key="AlphaCalendar" TargetType="Calendar">
    <Setter Property="CalendarButtonStyle" Value="{DynamicResource CalendarButtonStyle}"/>
    <Setter Property="CalendarDayButtonStyle" Value="{DynamicResource CalendarDayButtonStyle}"/>
    <Setter Property="CalendarItemStyle" Value="{DynamicResource CalendarItemStyle}"/>
    <Setter Property="BorderThickness" Value="0"/>
    <Setter Property="Foreground" Value="#FF333333"/>
    <Setter Property="Background" Value="{Binding BackgroundBrush}"/>
    <Setter Property="Effect">
        <Setter.Value>
            <DropShadowEffect BlurRadius="4" Direction="0" Opacity=".5" ShadowDepth="0" Color="Black"/>
        </Setter.Value>
    </Setter>