Silverlight 5.0 SolidColorBrush的ColorAnimation失败并显示“无法解析TargetName”

Question

我们在故事板中有3个动画在Silverlight 4中工作正常，但在Silverlight 5中因上述错误而失败。动画非常简单：

<Storyboard x:Name="categoryChangeStoryboard">
            <DoubleAnimation
                Storyboard.TargetName="clueTransform"
                Storyboard.TargetProperty="ScaleX"
                Duration="0:0:0.4"
                To="1.05"
                RepeatBehavior="3x"
                AutoReverse="True"
                />
            <DoubleAnimation
                Storyboard.TargetName="clueTransform"
                Storyboard.TargetProperty="ScaleY"
                Duration="0:0:0.4"
                To="1.1"
                RepeatBehavior="3x"
                AutoReverse="True"
                />
            <ColorAnimation
                Duration="0:0:0.4"
                Storyboard.TargetName="categoryForegroundBrush"
                Storyboard.TargetProperty="Color"
                From="Black"
                To="LightGreen"
                RepeatBehavior="3x"
                AutoReverse="True"
                />
        </Storyboard>

它的动画对象也非常简单：

<TextBlock x:Name="clue" Style="{StaticResource labelStyle}" Text="clue" FontSize="35" HorizontalAlignment="Right" MaxWidth="300" TextWrapping="Wrap" VerticalAlignment="Top" FontWeight="Bold" Margin="0,90,80,0" RenderTransformOrigin=".5,.5">
               <TextBlock.Foreground>
                    <SolidColorBrush Color="Black" x:Name="categoryForegroundBrush" />
                </TextBlock.Foreground>
                <TextBlock.RenderTransform>
                    <CompositeTransform x:Name="clueTransform"/>
                </TextBlock.RenderTransform>
            </TextBlock>

当我们打电话时

categoryChangeStoryboard.Begin();

我们收到以下错误 - 仅适用于Silverlight 5：

{System.InvalidOperationException: Cannot resolve TargetName categoryForegroundBrush.
   at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
   at MS.Internal.XcpImports.MethodEx(DependencyObject obj, String name)
   at System.Windows.Media.Animation.Storyboard.Begin()
   at BCL.FLY.FLYVisual.CoreStateUpdateEvent(Object sender, FLYStateUpdateEventArgs e)
   at BCL.FLY.FLYCore.OnStateUpdateEvent(FLYStateUpdateEventArgs e)
   at BCL.FLY.FLYCore.Report(String msg, GameEventType t, Butterfly b)
   at BCL.FLY.FLYCore.DebugGotoLevel(Int32 i)
   at BCL.FLY.FLYVisual.DebugGotoLevel(Int32 n)
   at BCL.FLY.FLYGame.GotoLevel(Int32 i)
   at C8Live.MainPage.lvlSkip_SelectionChanged(Object sender, SelectionChangedEventArgs e)
   at System.Windows.Controls.Primitives.Selector.OnSelectionChanged(SelectionChangedEventArgs e)
   at System.Windows.Controls.Primitives.Selector.InvokeSelectionChanged(List`1 unselectedItems, List`1 selectedItems)
   at System.Windows.Controls.Primitives.Selector.SelectionChanger.End()
   at System.Windows.Controls.Primitives.Selector.NotifyListItemSelected(ListBoxItem listBoxItem, Boolean isSelected)
   at System.Windows.Controls.Primitives.Selector.OnIsSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
   at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
   at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet, Boolean isBindingInStyleSetter)
   at System.Windows.DependencyObject.SetValue(DependencyProperty property, Boolean b)
   at System.Windows.Controls.Primitives.Selector.OnListBoxItemClicked(ListBoxItem item)
   at System.Windows.Controls.ListBoxItem.OnMouseLeftButtonDown(MouseButtonEventArgs e)
   at System.Windows.Controls.Control.OnMouseLeftButtonDown(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags)}

有没有人有任何想法？删除单个ColorAnimation确实可以解决问题，但我们更愿意保留它。

Answer 1

我已将此问题转载如下。

因为您在xaml中设置了Foreground并将x：Name添加到画笔中，所以后面的代码无法更改。应用样式的顺序首先是Style资源，然后是控件内部的任何内容，覆盖样式。

就像我说的那样，改变后面代码中的颜色会重现问题，因为它不包含name属性。正如您在下一张图片中看到的那样，我已经找到了解决方案，那就是设置DependecyProperty NameProperty的值。  

添加代码

solidColorBrush.SetValue(NameProperty, "categoryForegroundBrush");

你不应该再遇到这个问题了。