“[未知]”属性未指向路径中的 DependencyObject答案

【问题标题】：'[Unknown]' property does not point to a DependencyObject in path“[未知]”属性未指向路径中的 DependencyObject
【发布时间】：2014-05-04 13:33:00
【问题描述】：

我在边框上有一个动画

<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="Border">
    <EasingColorKeyFrame KeyTime="0" Value="#FF5E5E5E"/>
</ColorAnimationUsingKeyFrames>

它在运行时工作。

但在设计时出现以下错误：

'[Unknown]' property does not point to a DependencyObject in path '(0).(1)[1].(2)'.

谁能给我解释一下这是什么意思？

编辑：

动画的使用在控件模板中：

<ControlTemplate x:Key="GrayButtonTemplate" TargetType="{x:Type ButtonBase}">
        <Border 
            x:Name="Border"  
            CornerRadius="0" 
            BorderThickness="1">
            <Border.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="White" Offset="0"/>
                    <GradientStop Color="White" Offset="0.9"/>
                </LinearGradientBrush>
            </Border.Background>
            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="CommonStates">
                    <VisualState x:Name="Normal">
                        <Storyboard>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="Border">
                                <EasingColorKeyFrame KeyTime="0" Value="#FF5E5E5E"/>
                            </ColorAnimationUsingKeyFrames>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)" Storyboard.TargetName="Border">
                                <EasingColorKeyFrame KeyTime="0" Value="#FF818181"/>
                            </ColorAnimationUsingKeyFrames>
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[1].(GradientStop.Offset)" Storyboard.TargetName="Border">
                                <EasingDoubleKeyFrame KeyTime="0" Value="0.9"/>
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="MouseOver">
                        <Storyboard>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="Border">
                                <EasingColorKeyFrame KeyTime="0" Value="#FF383838"/>
                            </ColorAnimationUsingKeyFrames>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)" Storyboard.TargetName="Border">
                                <EasingColorKeyFrame KeyTime="0" Value="#FF5A5A5A"/>
                            </ColorAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Pressed">
                        <Storyboard>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="Border">
                                <EasingColorKeyFrame KeyTime="0" Value="#FF5A5A5A"/>
                            </ColorAnimationUsingKeyFrames>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)" Storyboard.TargetName="Border">
                                <EasingColorKeyFrame KeyTime="0" Value="#FF383838"/>
                            </ColorAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Disabled">
                        <Storyboard>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)" Storyboard.TargetName="Border">
                                <EasingColorKeyFrame KeyTime="0" Value="#FFBCBCBC"/>
                            </ColorAnimationUsingKeyFrames>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="Border">
                                <EasingColorKeyFrame KeyTime="0" Value="#FFABABAB"/>
                            </ColorAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
            <ContentPresenter 
                Margin="2"
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                RecognizesAccessKey="True"/>
        </Border>
    </ControlTemplate>

【问题讨论】：

向我们展示您为 Border TargetName 提供的 XAML。我的猜测是你里面没有面板，如果你有，没有> 1个渐变停止？
@NETscape。动画的使用在按钮的控制模板中，我在问题中添加了。

标签： wpf animation binding storyboard

【解决方案1】：

这是 Visual Studio 的bug，我可以在 2010 版本上确认这一点。在这种情况下，尝试为GradientStop设置名称：

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
    <GradientStop x:Name="MyStop1"  <---- Here
                  Color="White"
                  Offset="0" />

    <GradientStop x:Name="MyStop2"  <---- Here
                  Color="White"
                  Offset="0.9" />
</LinearGradientBrush>

并像这样使用：

<ControlTemplate x:Key="GrayButtonTemplate" TargetType="{x:Type ButtonBase}">
    <Border x:Name="Border"  
            CornerRadius="0" 
            BorderThickness="1">

        <Border.Background>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop x:Name="MyStop1" Color="White" Offset="0"/>
                <GradientStop x:Name="MyStop2" Color="White" Offset="0.9"/>
            </LinearGradientBrush>
        </Border.Background>

        <VisualStateManager.VisualStateGroups>
            <VisualStateGroup x:Name="CommonStates">
                <VisualState x:Name="Normal">
                    <Storyboard>
                        <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="Color" Storyboard.TargetName="MyStop2">
                            <EasingColorKeyFrame KeyTime="0" Value="#FF5E5E5E"/>
                        </ColorAnimationUsingKeyFrames>

                        <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="Color" Storyboard.TargetName="MyStop2">
                            <EasingColorKeyFrame KeyTime="0" Value="#FF818181"/>
                        </ColorAnimationUsingKeyFrames>

                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Offset" Storyboard.TargetName="MyStop1">
                            <EasingDoubleKeyFrame KeyTime="0" Value="0.9"/>
                        </DoubleAnimationUsingKeyFrames>
                    </Storyboard>
                </VisualState>

    ...

【讨论】：

它给出了以下错误：'Color' name cannot be found in the name scope of 'System.Windows.Controls.Border'.
@Hodaya Shalom：TargetName 应该是 GradientStop 的名称（在我的例子中是 MyStop2），而不是 Border 的名称。