Silverlight 4 RelativeSource FindAncestor绑定

Question

Silverlight 4中是否会有RelativeSource FindAncestor，AncestorType？

Answer 1

在Silverlight 4中，RelativeSource的{​​{1}}属性仍然只支持“Self”和“TemplatedParent”，此区域的Silverlight 3没有变化。

Answer 2

RelativeSource AncestorType is supported in Silverlight 5，现已上市。

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

Answer 3

也许您可以将XMAL中的ViewModel实例化为静态资源，然后将其作为绑定中的源引用。

<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

这可能有所帮助：

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