WPF跨项目引用DrawingGroup动态颜色失效问题求助

资源字典中的DrawingGroup默认是共享实例（x:Shared="True"为默认值），且作为Freezable类型会被自动冻结。冻结后的对象无法响应DynamicResource的资源变更通知，因此修改IconAccentBrush时，跨项目引用的DrawingGroup不会更新颜色。而内联的DrawingGroup属于控件树的一部分，不会被自动冻结，所以能正常响应资源变化。

以下是几种可行的解决方法：

方法1：给资源字典中的DrawingGroup设置x:Shared="False" #

修改ImageDictionary.xaml，为DrawingGroup添加x:Shared="False"属性，让每个控件引用时生成独立实例，避免被冻结，从而响应DynamicResource的变更：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <!-- 添加x:Shared="False"生成独立实例 -->
    <DrawingGroup x:Key="PushPinActiveDrawingGroup" 
                  x:Shared="False"
                  ClipGeometry="M-19,1 V512.9995 H492 V-19 H1 Z">
        <DrawingGroup.Transform>
            <TranslateTransform X="19" Y="-0.00097703933715820313" />
        </DrawingGroup.Transform>
        <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry1}" />
        <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry2}" />
        <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry3}" />
        <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry4}" />
        <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry5}" />
        <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry6}" />
    </DrawingGroup>
</ResourceDictionary>

ToggleButton代码保持不变即可。

方法2：在资源字典中定义DrawingImage并设置x:Shared="False" #

直接将DrawingImage放入资源字典，设置x:Shared="False"确保每个引用都是独立实例：

<!-- ImageDictionary.xaml -->
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <DrawingImage x:Key="PushPinActiveImage" x:Shared="False">
        <DrawingImage.Drawing>
            <DrawingGroup ClipGeometry="M-19,1 V512.9995 H492 V-19 H1 Z">
                <DrawingGroup.Transform>
                    <TranslateTransform X="19" Y="-0.00097703933715820313" />
                </DrawingGroup.Transform>
                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry1}" />
                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry2}" />
                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry3}" />
                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry4}" />
                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry5}" />
                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry6}" />
            </DrawingGroup>
        </DrawingImage.Drawing>
    </DrawingImage>
</ResourceDictionary>

然后在ToggleButton中直接引用：

<ToggleButton Margin="{StaticResource MainThickness}" IsChecked="{Binding IsPinned}">
    <Image Source="{DynamicResource PushPinActiveImage}" />
</ToggleButton>

方法3：使用Style创建独立的DrawingImage实例 #

通过Style为每个ToggleButton生成独立的DrawingImage实例：

<!-- 在资源字典中添加Style -->
<Style x:Key="PushPinToggleButtonStyle" TargetType="ToggleButton">
    <Setter Property="Content">
        <Setter.Value>
            <Image>
                <Image.Source>
                    <DrawingImage>
                        <DrawingImage.Drawing>
                            <DrawingGroup ClipGeometry="M-19,1 V512.9995 H492 V-19 H1 Z">
                                <DrawingGroup.Transform>
                                    <TranslateTransform X="19" Y="-0.00097703933715820313" />
                                </DrawingGroup.Transform>
                                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry1}" />
                                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry2}" />
                                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry3}" />
                                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry4}" />
                                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry5}" />
                                <GeometryDrawing Brush="{DynamicResource IconAccentBrush}" Geometry="{StaticResource ApplyColorGeometry6}" />
                            </DrawingGroup>
                        </DrawingImage.Drawing>
                    </DrawingImage>
                </Image.Source>
            </Image>
        </Setter.Value>
    </Setter>
</Style>

在ToggleButton中应用Style：

<ToggleButton Margin="{StaticResource MainThickness}" 
              IsChecked="{Binding IsPinned}"
              Style="{StaticResource PushPinToggleButtonStyle}" />

内容的提问来源于stack exchange，提问作者Olivier La Haye