如果给定 x:Key，则样式会产生不同的渲染结果

Question

如果给定 x:Key

，样式会产生不同的渲染结果

我有以下样式和 ToggleButtons 的 ControlTemplate，它们按我想要的方式工作。

<Style TargetType="RadioButton" BasedOn="{StaticResource {x:Type ToggleButton}}"/>
<ControlTemplate TargetType="RadioButton" x:Key="RadioTemplate">
    <RadioButton IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsChecked, Mode=TwoWay}">
        <RadioButton.Content>
            <Viewbox StretchDirection="DownOnly" Stretch="Uniform">
                <ContentControl Content="{TemplateBinding Content}"/>
            </Viewbox>
        </RadioButton.Content>
    </RadioButton>
</ControlTemplate>

然而，当我给 Style 一个 x:Key 并且 ControlTemplate 中的 RadioButton 继承 Style 时，如下所示，渲染结果和上面代码给出的不一样

<Style TargetType="RadioButton" BasedOn="{StaticResource {x:Type ToggleButton}}" x:Key="RadioStyle"/>
<ControlTemplate TargetType="RadioButton" x:Key="RadioTemplate">
    <RadioButton Style="{StaticResource RadioStyle}"
                 IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsChecked, Mode=TwoWay}">
        <RadioButton.Content>
            <Viewbox StretchDirection="DownOnly" Stretch="Uniform">
                <ContentControl Content="{TemplateBinding Content}"/>
            </Viewbox>
        </RadioButton.Content>
    </RadioButton>
</ControlTemplate>

谁能告诉我为什么会这样？

Answer 1

指定一个时需要使用密钥。带键的样式不会自动反映到切换按钮上。

Answer 2

MSDN 文档：

Setting the TargetType property to the RadioButton type without setting an x:Key implicitly sets the x:Key to {x:Type RadioButton }. This also means that if you give the above Style an x:Key value of anything other than {x:Type RadioButton}, the Style would not be applied to all RadioButton elements automatically. Instead, you need to apply the style to the RadioButton elements explicitly like "{StaticResource RadioStyle}".

如果给定 x:Key，则样式会产生不同的渲染结果

A style gives rise to a different rendering result if given a x:Key

c#

wpf

controltemplate