WindowsPhone : RelativeSource Mode=FindAncestor，AncestorType : CannotResolve SymbolAncestorType

Question

我正在模板化一个列表框。我喜欢仅在选中项目时才显示路径。

DataTemplate：

<DataTemplate x:Key="itplPlayerOfTheDay">
    <Grid>
        ...
        <Grid Width="50" Height="50" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,5,5,0">
            <Path Visibility="{Binding RelativeSource={RelativeSource Mode=FindAncestor , AncestorType={ListBoxItem}}, Path=IsSelected, Converter={StaticResource BooleanToVisibilityConverter}}"  Data="M32.5569,7.54591 C32.3883,13.1553 31.3485,16.9274z" Stretch="Uniform" Stroke="Black" >
            </Path>
        </Grid>
        ...
    </Grid>
</DataTemplate>

很明显，我的XAML有问题。设计器中的状态为:无法解析符号祖先类型。

Answer 1

Windows Phone不支持AncestorType。

<DataTemplate x:Key="itplPlayerOfTheDay">
    <Grid>
        ...
        <Grid Width="50" Height="50" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,5,5,0">
            <Path Visibility="{Binding ElementName=yourListBoxName, Path=SelectedItem, Converter={StaticResource BooleanToVisibilityConverter}}"  Data="M32.5569,7.54591 C32.3883,13.1553 31.3485,16.9274z" Stretch="Uniform" Stroke="Black" >
            </Path>
        </Grid>
        ...
    </Grid>
</DataTemplate>  

在您的BooleanToVisibilityConverter中进行一些更改，然后完成！