为什么我不能参考ActualWidth作为一个值，我可以在代码中使用它。
XAML:
<StackPanel>
<Button x:Name="cmdVibrate" HorizontalAlignment="Center">
<Button.Triggers>
<EventTrigger RoutedEvent="Button.MouseEnter">
<BeginStoryboard>
<Storyboard >
<DoubleAnimation From="{Binding RelativeSource={RelativeSource Mode=Self},Path=ActualWidth}" By="200" AutoReverse="True" Duration="0:0:1" Storyboard.TargetProperty="Width"></DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
Mouse over me to shake
</Button>
</StackPanel>
</Window>
RelativeSource={RelativeSource Mode=Self}可能会指的是DoubleAnimation（它没有ActualWidth财产）。尝试寻找祖先Button instead
From="{Binding RelativeSource={RelativeSource AncestorType={x:Type Button}},
Path=ActualWidth}"
Xaml
<StackPanel>
<Button x:Name="cmdVibrate" HorizontalAlignment="Center">
<Button.Triggers>
<EventTrigger RoutedEvent="Button.MouseEnter">
<BeginStoryboard>
<Storyboard >
<DoubleAnimation From="{Binding RelativeSource={RelativeSource AncestorType={x:Type Button}}, Path=ActualWidth}"
By="200"
AutoReverse="True"
Duration="0:0:1"
Storyboard.TargetProperty="Width"></DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
Mouse over me to shake
</Button>
</StackPanel>
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