Wpf 绑定到StackPanel DockPanel.Dock

我有一个StackPanel，可以停靠在DockPanel内部的左侧或右侧。StackPanel中的项目应该像祖先一样停靠在同一侧。为了进行测试，我在可视化树中得到了祖先的名字，但我不知道如何绑定到Docking.Dock。提前谢谢

<DockPanel>
  <StackPanel x:Name="RightHandContainer" DockPanel.Dock="Right">
    <v:MyUsercontrol TextCaption="Hard-Coded Alignment Works" Alignment="Right" />
    <v:MyUsercontrol TextCaption="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=StackPanel, AncestorLevel=1}, Path=Name}"                  
                       Alignment="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=StackPanel, AncestorLevel=1}, Path=Docking.Dock}" />
    <!-- TextCaption is is a dependencyproperty of Type string, works fine ... my Text object automatically gets 'RightHandContainer' -->
    <!-- Alignment is is a dependencyproperty of Type Dock, like Docking.Dock ... Binding will not work :( -->
  </StackPanel>
</DockPanel>

---

一种方法是创建一个值转换器。将属性绑定到stackpanel本身，抓住valueconverter内的dock并返回所需的任何内容。大概是这样的：

<Window.Resources>
    <app:TestConverter x:Key="TestConverter" />
</Window.Resources>
<DockPanel>
    <StackPanel x:Name="RightHandContainer" DockPanel.Dock="Right">
        <TextBlock Text="Test" HorizontalAlignment="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=StackPanel, AncestorLevel=1}, Converter={StaticResource TestConverter}}"  />
    </StackPanel>
</DockPanel>

我使用了水平对齐，但您可以返回任何需要的内容

public class TestConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        HorizontalAlignment alignment = HorizontalAlignment.Left;

        StackPanel stackPanel = value as StackPanel;
        if (stackPanel != null)
        {
            Dock dock = DockPanel.GetDock(stackPanel);
            switch (dock)
            {
                case Dock.Left: alignment = HorizontalAlignment.Left; break;
                case Dock.Right: alignment = HorizontalAlignment.Right; break;
            }
        }   
        return alignment;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}