Wpf 控件样式写法

<MenuItem Header="复制">
<MenuItem.Style>
<Style TargetType="MenuItem">
<Style.Triggers>
<DataTrigger Binding="{Binding IsAllowCopy,Mode=TwoWay}" Value="False">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</MenuItem.Style>
</MenuItem>