绘制特殊背景

不知道差距应该有多大。但是,您可以这样调整画笔:

<Window.Background>
    <DrawingBrush TileMode="Tile" ViewportUnits="Absolute" Viewport="0,0,100,100">
        <DrawingBrush.Drawing>
            <DrawingGroup>
                <GeometryDrawing Brush="White">
                    <GeometryDrawing.Geometry>
                        <RectangleGeometry Rect="0,0,100,100"/>
                    </GeometryDrawing.Geometry>
                </GeometryDrawing>
                <GeometryDrawing
                    Geometry="M50,0 L50,40 M50,60 L50,100 M0,50 L40,50 M60,50 L100,50">
                    <GeometryDrawing.Pen>
                        <Pen Brush="Red" Thickness="20"/>
                    </GeometryDrawing.Pen>
                </GeometryDrawing>
            </DrawingGroup>
        </DrawingBrush.Drawing>
    </DrawingBrush>
</Window.Background>

<Window.Background>
    <DrawingBrush TileMode="FlipXY" ViewportUnits="Absolute" Viewport="0,0,50,50">
        <DrawingBrush.Drawing>
            <DrawingGroup>
                <GeometryDrawing Brush="White">
                    <GeometryDrawing.Geometry>
                        <RectangleGeometry Rect="0,0,50,50"/>
                    </GeometryDrawing.Geometry>
                </GeometryDrawing>
                <GeometryDrawing Geometry="M0,45 L40,45 M45,0 L45,40">
                    <GeometryDrawing.Pen>
                        <Pen Brush="Red" Thickness="10"/>
                    </GeometryDrawing.Pen>
                </GeometryDrawing>
            </DrawingGroup>
        </DrawingBrush.Drawing>
    </DrawingBrush>
</Window.Background>