为什么绑定没有更新

背景

我所拥有的摘要是一个用户控件 MarkdownEditor . 它包含一个 TextBox 显示属性如下 FontFamily , Background 等由绑定控制。它从一个 MarkdownEditorOptions 类,其中包含这些值的每个属性。我的代码如下

在 ShellView ,显示如何设置 文本框 在我的 标记编辑器

<me:MarkdownEditor>
    <me:MarkdownEditor.Options>
        <me:MarkdownEditorOptions Background="Red" />
    </me:MarkdownEditor.Options>
</me:MarkdownEditor>

在 MarkdownEditor.xaml.cs ,markdowneditor(usercontrol)的dataContext,的声明 Options

public MarkdownEditorOptions Options
{
    get { return (MarkdownEditorOptions)GetValue(OptionsProperty); }
    set { SetValue(OptionsProperty, value); }
}

public static readonly DependencyProperty OptionsProperty =
    DependencyProperty.Register("Options", typeof(MarkdownEditorOptions), typeof(MarkdownEditor), new UIPropertyMetadata(new MarkdownEditorOptions()));

在 MarkdownEditor.xaml :显示路线 文本框 绑定到选项值

<TextBox Grid.Row="1" x:Name="txtEditor" AcceptsReturn="True" Text="{Binding Path=Content, UpdateSourceTrigger=PropertyChanged}" 
            FontFamily="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:MarkdownEditor}}, Path=Options.FontFamily}"
            FontSize="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:MarkdownEditor}}, Path=Options.FontSize}"
            FontWeight="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:MarkdownEditor}}, Path=Options.FontWeight}"
            Background="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:MarkdownEditor}}, Path=Options.Background, Converter={StaticResource colorToBrushConverter}}"
            Foreground="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:MarkdownEditor}}, Path=Options.Foreground, Converter={StaticResource colorToBrushConverter}}" />

这个 标记编辑器选项 班

// MarkdownEditorOptions
public class MarkdownEditorOptions : ObservableObject
{
    protected FontFamily _fontFamily;
    protected int _fontSize;
    protected FontWeight _fontWeight;
    protected Color _background;
    protected Color _foreground;

    // Constructor, for default options
    public MarkdownEditorOptions()
    {
        _fontFamily = new FontFamily("Consolas");
        _fontSize = 14;
        _fontWeight = FontWeights.Bold;
        _background = new Color { R = 32, G = 32, B = 32, A = 255 };
        _foreground = new Color { R = 255, G = 255, B = 255, A = 255 };
    }

    public FontFamily FontFamily {
        get { return _fontFamily; }
        set {
            _fontFamily = value;
            RaisePropertyChanged("FontFamily");
        }
    }

    public int FontSize
    {
        get { return _fontSize; }
        set {
            _fontSize = value;
            RaisePropertyChanged("FontSize");
        }
    }

    public FontWeight FontWeight
    {
        get { return _fontWeight; }
        set {
            _fontWeight = value;
            RaisePropertyChanged("FontWeight");
        }
    }

    public Color Background
    {
        get { return _background; }
        set {
            _background = value;
            RaisePropertyChanged("Background");
        }
    }

    public Color Foreground
    {
        get { return _foreground; }
        set {
            _foreground = value;
            RaisePropertyChanged("Foreground");

        }
    }
}

问题

markdowneditor中的“我的文本框”始终显示的是 标记编辑器选项 . 在我展示的简单XAML中,似乎没有应用红色背景。怎么了?

[更新时间:11月17日下午4:25]

一些想法

我想这和 Path=Options.FontSize . 也许这个绑定将跟踪 选项 而不是 Options.FontSize ?

更新时间:11月19日

一些观察:如果我在单独的简单窗口中使用控件

<Window ...>
    <Window.Resources>
        <me:MarkdownEditorOptions FontFamily="Arial" FontWeight="Normal" Background="Red" x:Key="options" />
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions ... />
        <Button Content="Options ..." Grid.Row="0" Click="Button_Click" />
        <me:MarkdownEditor Grid.Row="1" Options="{StaticResource options}" x:Name="markdownEditor" />
    </Grid>
</Window>

如果我在更复杂的设置中使用它,一切都会正常工作。 TabControl 绑定到 ObservableCollection<TabViewModel> ,失败了

<TabControl ... ItemsSource="{Binding TabsViewSource}" IsSynchronizedWithCurrentItem="True">

我试着用和不绑。似乎是二传手 标记编辑器选项 如我所说,是运行 Debug.WriteLine() 但背景等没有更新。

<DataTemplate DataType="{x:Type vm:EditorTabViewModel}">
    <!--<me:MarkdownEditor Options="{Binding RelativeSource={RelativeSource AncestorType={x:Type v:ShellView}}, Path=ViewModel.Options}" />-->
    <me:MarkdownEditor>
        <me:MarkdownEditor.Options>
            <me:MarkdownEditorOptions Background="Red" />
        </me:MarkdownEditor.Options>
    </me:MarkdownEditor>
</DataTemplate>