MultiBinding 的问

Question

 <!--竖线-->
                       
                        <Rectangle x:Name="vLine" Grid.Column="0"   VerticalAlignment="Stretch"
                                    Fill="#FF678B03" StrokeThickness="0" SnapsToDevicePixels="true" MinWidth="1">
                            <Rectangle.Width >
                                <!--<Binding   Mode="OneWay" IsAsync="True"
                            Converter="{StaticResource vertLineConv}"
                            RelativeSource="{RelativeSource
                                AncestorLevel=1,
                                AncestorType={x:Type TreeViewItem}}"/>-->
                                <MultiBinding Converter="{StaticResource vertLineConv}"  >
                                    <Binding  RelativeSource="{RelativeSource AncestorLevel=1,AncestorType={x:Type TreeViewItem}}"/>
                                    <Binding Path="Items"  
                                                RelativeSource="{RelativeSource AncestorLevel=1,AncestorType={x:Type TreeViewItem}}"/>
                                </MultiBinding>
                            </Rectangle.Width>
                        </Rectangle>

	public class VertLineConv : IMultiValueConverter,IValueConverter
	{

        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
                          return 4;
                }

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

返回值一直没用不知道为什么，

---

Swat