Silverlight 4 RelativeSource FindAncestor绑定

Question

会不会有RelativeSource FindAncestor，AncestorType...在Silverlight 4中？

Answer 1

在Silverlight4中，Binding的RelativeSource属性仍然只支持"Self“和"TemplatedParent"，这方面与Silverlight3没有什么不同。

Answer 2

RelativeSource AncestorType is supported in Silverlight 5，现已推出。

<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，然后在绑定中引用该资源作为源。

<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>