WPF 宽度跟父控件(或者另一个控件)走

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<UserControl     Width="{Binding RelativeSource=             {RelativeSource FindAncestor,             AncestorType={x:Type ListView}},             Path=ActualWidth}"     Height="{Binding RelativeSource=             {RelativeSource FindAncestor,               AncestorType={x:Type ListView}},               Path=ActualHeight}"> <!-- Content -->   </UserControl>

　 来自

 

 <hc:ScrollViewer x:Name="scrList"  >
            <WrapPanel Orientation="Horizontal" Width="{Binding ElementName=scrList, Path=Width, Mode=OneWay}" HorizontalAlignment="Center">

注意绑定  Mode = OneWay(a => b, b ≠> a)