Silverlight 4 RelativeSource FindAncestor绑定

Question

在Silverlight 4中会有RelativeSource FindAncestor，AncestorType ...吗？

Answer 1

在Silverlight 4中，RelativeSource属性Binding还只支持“Self”和“TemplatedParent”，这个区域没有Silverlight 3的变化。

Answer 2

这可能会帮助：

http://blog.thekieners.com/2010/09/08/relativesource-binding-with-findancestor-mode-in-silverlight/

Answer 3

也许你可以实例化视图模型在XMAL为静态资源，然后引用，如您绑定的源。

<UserControl.Resources> 
    <vm:MainPageViewModel x:Key="ViewModel"/> 
</UserControl.Resources> 

<Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource ViewModel}}"> 
    <ListBox ItemsSource="{Binding Partitions}"> 
     <ListBox.ItemsPanel> 
      <ItemsPanelTemplate> 
       <toolkit:WrapPanel FlowDirection="LeftToRight" /> 
      </ItemsPanelTemplate> 
     </ListBox.ItemsPanel> 
     <ListBox.ItemTemplate> 
      <DataTemplate> 
       <Button Margin="10,0" Width="40" Content="{Binding}" Command="{Binding Source={StaticResource ViewModel}, Path=ButtonCommand}" CommandParameter="{Binding}"/> 
      </DataTemplate> 
     </ListBox.ItemTemplate> 
    </ListBox> 

</Grid> 

Answer 4

RelativeSource AncestorTypeis supported in Silverlight 5，它现在可用。

<TextBlock Text="{Binding Name}" 
      FontSize="{Binding DataContext.CustomFontSize, 
       RelativeSource={RelativeSource AncestorType=UserControl}}" 
/>