如何对不同的`TextBlock`对象应用样式？

<TextBlock Style="{StaticResource MyTextStyle}" Text="Hello World!" />

<Page.Resources>
    <Style x:Key="MyTextStyle" TargetType="TextBlock">
        <Setter Property="FontSize" Value="16" />
        <Setter Property="Foreground" Value="Red" />
    </Style>
</Page.Resources>

<TextBlock Style="{StaticResource MyTextStyle}" Text="Hello World!" />

<Page.Resources>
    <Style x:Key="HeadingStyle" TargetType="TextBlock">
        <Setter Property="FontSize" Value="20" />
        <Setter Property="Foreground" Value="Blue" />
    </Style>
    <Style x:Key="NormalStyle" TargetType="TextBlock">
        <Setter Property="FontSize" Value="16" />
        <Setter Property="Foreground" Value="Black" />
    </Style>
</Page.Resources>

<TextBlock Style="{StaticResource HeadingStyle}" Text="Heading" />
<TextBlock Style="{StaticResource NormalStyle}" Text="Normal Text" />

<Page.Resources>
    <Style x:Key="LongTextBlockStyle" TargetType="TextBlock">
        <Setter Property="FontSize" Value="16" />
        <Setter Property="Foreground" Value="Red" />
    </Style>
    <Style x:Key="ShortTextBlockStyle" TargetType="TextBlock">
        <Setter Property="FontSize" Value="12" />
        <Setter Property="Foreground" Value="Green" />
    </Style>
</Page.Resources>

<TextBlock Text="Long Text" Style="{StaticResource LongTextBlockStyle}">
    <TextBlock.Style>
        <Style TargetType="TextBlock">
            <Style.Triggers>
                <Trigger Property="TextBlock.Text" Value="Long Text">
                    <Setter Property="Style" Value="{StaticResource LongTextBlockStyle}" />
                </Trigger>
                <Trigger Property="TextBlock.Text" Value="Short Text">
                    <Setter Property="Style" Value="{StaticResource ShortTextBlockStyle}" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>