Question

在我的项目中，我有一个文件来创建WPF的大部分样式。我正在尝试设置TextBlock的背景并为其ViewBox设置动画以赋予其旋转木马效果。当应用程序加载时，当所有控件都存在时，我能够成功完成。但是，在我添加一个匹配新触发器的控件后，它会抛出异常。这是我的代码

<Style TargetType="{x:Type TextBlock}">
                    <!-- Image Carousal -->
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Grid}, AncestorLevel=4},Path=Name}" Value="WelcomeScreen_Master" />
                            <Condition Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Grid}}, Path=Name}" Value="LayoutMainTitleGrid" />
                            <Condition Binding="{Binding RelativeSource={RelativeSource Self},Path=Name}" Value="Banner"/>
                        </MultiDataTrigger.Conditions>
                        <MultiDataTrigger.Setters>
                            <Setter Property="Width" Value="400" />
                            <Setter Property="Height" Value="146" />
                            <Setter Property="Foreground" Value="Transparent"/>
                            <Setter Property="HorizontalAlignment" Value="Center"/>
                            <Setter Property="Margin" Value="620,200,0,0" />
                            <Setter Property="Background">
                                <Setter.Value>
                                    <ImageBrush
                                            ImageSource="pack://application:,,,/LoremTheme;component/images/rotate.png" 
                                            Stretch="UniformToFill"
                                            AlignmentY="Top" 
                                            AlignmentX="Right"
                                            ViewboxUnits="Absolute" Viewbox="0,0,400,146"
                                            ViewportUnits="Absolute" Viewport="0,0,300,109.5"
                                            >
                                    </ImageBrush>
                                </Setter.Value>
                            </Setter>
                        </MultiDataTrigger.Setters>
                        <MultiDataTrigger.EnterActions>
                            <BeginStoryboard>
                                <Storyboard>
                                    <RectAnimation Storyboard.TargetProperty="Background.Viewbox"
                                        To="0,0,400,146" BeginTime="0:0:5" Duration="0:0:0.1" />
                                </Storyboard>
                            </BeginStoryboard>
                        </MultiDataTrigger.EnterActions>
                    </MultiDataTrigger>
                </Style.Triggers>
            </Style>

如果我在代码中设置TextBlock的背景图像但是它不是选项，因为应用程序将具有不同的样式文件，代码可以工作。如果我从上面的样式中删除，我仍然可以设置没有动画的边框，这意味着xaml可以设置背景。但如果我保持，则会出现以下异常。

---------------------------
Active Window : Exception
---------------------------


 Method:Void VerifyPathIsAnimatable(System.Windows.PropertyPath)

System.InvalidOperationException: Cannot resolve all property references in the property path 'Background.Viewbox'. Verify that applicable objects support the properties.
   at System.Windows.Media.Animation.Storyboard.VerifyPathIsAnimatable(PropertyPath path)
   at System.Windows.Media.Animation.Storyboard.ClockTreeWalkRecursive(Clock currentClock, DependencyObject containingObject, INameScope nameScope, DependencyObject parentObject, String parentObjectName, PropertyPath parentPropertyPath, HandoffBehavior handoffBehavior, HybridDictionary clockMappings, Int64 layer)

如何让动画有效？现在我的假设是动画在样式设置背景之前开始，所以有没有办法延迟故事板？还是有另一种解决方案？

具有MultiDataTrigger背景图像的多重条件的WPF Storyboard动画ViewBox异常

0 个答案: