wpf 背景属性未指向路径“(0).(1)”中的依赖项对象
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Background property does not point to a dependencyobject in path '(0).(1)'
提问by Maya
I wrote this code and got an exception:
我写了这段代码并得到了一个例外：
Background property does not point to a dependencyobject in path '(0).(1)'
背景属性未指向路径“(0).(1)”中的依赖项对象
I saw this problem in other posts in the forum but didn't founded a solution.
我在论坛的其他帖子中看到了这个问题，但没有找到解决方案。
<WrapPanel.Style>
<Style>
<Style.Triggers>
<Trigger Property "WrapPanel.Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard HandoffBehavior="Compose">
<Storyboard RepeatBehavior="Forever" AutoReverse="True">
<ColorAnimation
Storyboard.TargetProperty="(WrapPanel.Background).(SolidColorBrush.Color)"
Duration="00:00:01" To="Red"/>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</Style.Triggers>
</Style>
</WrapPanel.Style>
Any help with this?
有什么帮助吗？
回答by dlev
You most likely failed to set a value for the initial background brush. You can either do so with a style setter, or else just set a value on the panel directly. The style setter is probably better:
您很可能没有为初始背景画笔设置值。您可以使用样式设置器执行此操作，也可以直接在面板上设置值。样式设置器可能更好：
<Setter Property="Background">
<Setter.Value>
<SolidColorBrush Color="Blue"/>
</Setter.Value>
</Setter>
Note that you can also specify the TargetTypeproperty on your style, so that you don't have to prefix all property reference with WrapPanel:
请注意，您还可以TargetType在样式上指定属性，这样您就不必在所有属性引用前加上WrapPanel：
<Style TargetType="WrapPanel">
回答by JeffRSon
You must set the Background property of the WrapPanel! Otherwise the WPF subsystem doesn't recognize it as a SolidColorBrush (could be another brush as well).
您必须设置 WrapPanel 的 Background 属性！否则 WPF 子系统不会将其识别为 SolidColorBrush（也可能是另一个画笔）。
<WrapPanel Background="White">
...
</WrapPanel>
is sufficient.
足够了。
