c# - x :Type not found in user control library

Question

我正在尝试在 WPF 用户控件库项目中创建一个 ResourceDictionary。当我添加以下样式时:

<Style TargetType="{x:Type Button}">
    <Setter Property="Background" Value="{StaticResource ResourceKey=GreyBrush}"/>
    <Setter Property="BorderBrush" Value="{StaticResource ResourceKey=LightBlueBrush}"/>
    <Setter Property="BorderThickness" Value="1"/>
    <Style.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Background" Value="{StaticResource ResourceKey=OrangeBrush}"/>
        </Trigger>
        <EventTrigger RoutedEvent="Click">
            <BeginStoryboard>
                <Storyboard>
                    <ColorAnimation Storyboard.TargetProperty="Background.Color" To="{StaticResource ResourceKey=LightOrange}" Duration="0:0:.1"/>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Style.Triggers>
</Style>

我收到一条错误消息:

The type 'x:Type' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.

我将 x 声明为:

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

当我在 WPF 应用程序项目中而不是在 UserControl 库项目中创建资源字典时，这会起作用。知道为什么吗？

Answer 1

当我编写 IE 扩展并想要创建 WPF 用户控件时，这发生在我身上。由于该项目最初不是 WPF 项目，因此没有对 System.Xaml 的引用，添加该引用解决了该问题。