在ScrollBarViewer的RepeatButton中使用背景图像不会显示图像

Question

我正在尝试在WPF中创建自己的滚动查看器，它工作得很好，除了RepeatButton中的背景图像。如果我使用SolidColorBrush而不是ImageBrush，它工作得很好。下面是我的xaml，我已经验证了可以通过在滚动条中的其他地方添加ImageSource (特别是轨迹图像)来找到它。你知道为什么吗？forground Image显示正常。

<Style x:Key="ScrollBarButtonStyle" TargetType="RepeatButton">
    <Setter Property="HorizontalContentAlignment" Value="Center"/>
    <Setter Property="VerticalContentAlignment" Value="Center"/>
    <Setter Property="Width" Value="50"/>
    <Setter Property="Height" Value="50"/>        
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="RepeatButton">
                <Grid Name="ButtonBackground">
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="CommonStates">
                            <VisualState x:Name="Normal">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonBackground" Storyboard.TargetProperty="Background">
                                        <DiscreteObjectKeyFrame KeyTime="0">
                                            <DiscreteObjectKeyFrame.Value>
                                                <ImageBrush ImageSource="{DynamicResource ListItemBackgroundBttnNormal}"/>
                                            </DiscreteObjectKeyFrame.Value>
                                        </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="Pressed">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonBackground" Storyboard.TargetProperty="Background">
                                        <DiscreteObjectKeyFrame KeyTime="0">
                                            <DiscreteObjectKeyFrame.Value>
                                                <ImageBrush ImageSource ="{DynamicResource ListItemBackgroundBttnPressed}"/>
                                            </DiscreteObjectKeyFrame.Value>
                                        </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="Disabled">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonBackground" Storyboard.TargetProperty="Background">
                                        <DiscreteObjectKeyFrame KeyTime="0">
                                            <DiscreteObjectKeyFrame.Value>
                                                <ImageBrush ImageSource = "{DynamicResource ListItemBackgroundBttnDisabled}"/>
                                            </DiscreteObjectKeyFrame.Value>
                                        </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>
                                    <DoubleAnimation Storyboard.TargetName="contentPresenter" Storyboard.TargetProperty="Opacity" From="1.0" To="0.5"/>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="MouseOver">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonBackground" Storyboard.TargetProperty="Background">
                                        <DiscreteObjectKeyFrame KeyTime="0">
                                            <DiscreteObjectKeyFrame.Value>
                                                <ImageBrush ImageSource="{DynamicResource ListItemBackgroundBttnNormal}"/>
                                            </DiscreteObjectKeyFrame.Value>
                                        </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>
                    <ContentPresenter
                          x:Name="contentPresenter"
                          Content="{TemplateBinding Content}"
                          ContentTemplate="{TemplateBinding ContentTemplate}"
                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                          HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                          Margin="{TemplateBinding Padding}"/>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Answer 1

尝试将DynamicResource更改为StaticResource，看看它是否仍然有效。如果找不到路径，DynamicResource不会显示任何错误，而StaticResource会执行tihs。我假设您的图像来源在这种情况下是未知的。确保您在<ResourceDictionary.MergedDictionaries>的App.xaml中添加了资源。