Why is my icon color not changing when I change the base resource-CodePudding

I have an icon defined as:

<DrawingImage x:Key="CloseIcon">
    <DrawingImage.Drawing>
        <DrawingGroup ClipGeometry="M0,0 V27 H28 V0 H0 Z">
            <DrawingGroup.Transform>
                <TranslateTransform X="3.9828000068664551" Y="0" />
            </DrawingGroup.Transform>
            <DrawingGroup Opacity="1" Transform="1,0,0,1,0.885057,0.5">
              <DrawingGroup Opacity="1" Transform="...">
                <GeometryDrawing Brush="{DynamicResource PrimaryBrush}" Geometry="..." />
              </DrawingGroup>
              <DrawingGroup Transform="...">
                 <GeometryDrawing Brush="{DynamicResource PrimaryBrush}" Geometry="..." /> 
              </DrawingGroup>
            </DrawingGroup>
        </DrawingImage.Drawing>
    </DrawingImage>

I have simplified the above xaml, there are a ton more nested DrawingGroups than in the actual code.

At run time, I am trying to do the following: The PrimaryBrush resource is set on load.

Then later on in the application I am trying to do the following:

Application.Current.Resources["PrimaryBrush"] = new SolidColorBrush(Colors.Green);

But the icon remains the same color. My understanding was that anything that had a DynamicResource would change when you changed that dynamic resource.

How do change the icon color at runtime?

(fyi, I have spent at least a week investigating and trying to figure this out, and to no avail),

Update (1/13/2023 14:10 EST

The DrawingImage is defined in a file called IconResourcs.xaml
This file is included via ResourceDictionary.MergedDictionaries in the Resources.xaml file of an assembly that gets loaded at application start.

CodePudding user response：

DrawingImage extends Freezable. To allow the modification of nested Freezable resources you must define them with the x:Shared attribute set to false:

<DrawingImage x:Key="CloseIcon"
              x:Shared="False">
</DrawingImage>