2

我在资源字典中覆盖了几个 XAML 定义的绘图组，并注意到一些奇怪的行为。如果我这样定义一个 DrawingImage ：

<DrawingImage x:Key="My_Icon">
    <DrawingImage.Drawing>
        <DrawingGroup>
            <DrawingGroup.Children>
                <StaticResource ResourceKey="Background" />
                <StaticResource ResourceKey="Foreground" />
                <DrawingGroup>
                    <!-- some content here for an overlay -->
                </DrawingGroup>
            </DrawingGroup.Children>
        </DrawingGroup>
    </DrawingImage.Drawing>
</DrawingImage>

在设计时一切正常，但在运行时出现异常：

'XAML 节点流：'System.Windows.Markup.StaticResourceHolder' 的值必须遵循 StartObject 和 StartMember。行号“14”和行位置“22”。

但是，如果我在静态资源之前插入一个空的 DrawingGroup 标记，一切正常：

<DrawingImage x:Key="My_Icon">
    <DrawingImage.Drawing>
        <DrawingGroup>
            <DrawingGroup.Children>
                <DrawingGroup />
                <StaticResource ResourceKey="Background" />
                <StaticResource ResourceKey="Foreground" />
                <DrawingGroup>
                    <!-- some content here for an overlay -->
                </DrawingGroup>
            </DrawingGroup.Children>
        </DrawingGroup>
    </DrawingImage.Drawing>
</DrawingImage>

有谁知道为什么会这样？我假设这是一个通用的 XAML 节点处理错误，而不是特定于 DrawingGroups，但我可能是错的......

请注意，有问题的 StaticResources 是 DrawingGroups：

<DrawingGroup x:Key="Background">
    <DrawingGroup.Children>
        <GeometryDrawing Geometry="M 3,1.00001L 29,1.00001C 30.1046,1.00001 31,1.89544 31,3.00001L 31,29C 31,30.1046 30.1046,31 29,31L 3,31C 1.89543,31 1,30.1046 1,29L 1,3.00001C 1,1.89544 1.89543,1.00001 3,1.00001 Z ">
            <GeometryDrawing.Pen>
                <Pen LineJoin="Round" Brush="#FFEB8E00"/>
            </GeometryDrawing.Pen>
            <GeometryDrawing.Brush>
                <RadialGradientBrush RadiusX="0.516666" RadiusY="0.516666" Center="0.499999,0.966667" GradientOrigin="0.499999,0.966667">
                    <RadialGradientBrush.GradientStops>
                        <GradientStop Color="#FFFFECA8" Offset="0"/>
                        <GradientStop Color="#FFFFCD52" Offset="0.2"/>
                        <GradientStop Color="#FFFFCD52" Offset="0.669767"/>
                        <GradientStop Color="#FFFFB100" Offset="0.95814"/>
                    </RadialGradientBrush.GradientStops>
                    <RadialGradientBrush.RelativeTransform>
                        <TransformGroup/>
                    </RadialGradientBrush.RelativeTransform>
                </RadialGradientBrush>
            </GeometryDrawing.Brush>
        </GeometryDrawing>
        <GeometryDrawing Brush="#67F9F0AD" Geometry="M 4,19L 28,19C 29.1046,19 30,19.8954 30,21L 30,28C 30,29.1046 29.1046,30 28,30L 4,30C 2.89543,30 2,29.1046 2,28L 2,21C 2,19.8954 2.89543,19 4,19 Z "/>
    </DrawingGroup.Children>
</DrawingGroup>

我的用法很简单——我将整个 DrawingImage 绑定到 Infragistics WPF 按钮控件：

<igWPF:ButtonTool igWPF:RibbonGroup.MaximumSize="ImageAndTextLarge" Caption="New Item" SmallImage="{StaticResource My_Icon}" LargeImage="{StaticResource My_Icon}" />
4

0 回答 0