缺少Style.Triggers和x：类型。为什么？

Question

<TextBlock Text="{Binding MyTextProperty}">
    <TextBlock.Style>
        <Style TargetType="{x:Type TextBox}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding MyTextProperty}" Value="{x:Null}">
                    <Setter Property="Text" Value="Hey, the text should not be empty!" />
                    <Setter Property="Foreground" Value="Red" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

问题1：为什么<Style TargetType="{x:Type TextBox}">提供错误The type 'x:Type' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.

问题2：为什么我收到错误The attachable property 'Triggers' was not found in type 'Style'.

我错过了什么吗？

Answer 1

看起来您正在尝试在Silverlight中使用WPF XAML。 Silverlight不支持{x:Type}标记扩展。您可以使用TargetType={TextBox}。

此外，Silverlight没有DataTrigger支持！

请参阅：

What is the replacement for DataTrigger in Silverlight