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Asked: 2026-05-11T08:31:37+00:00

In WPF, is there an easy way to add wavy underlines (like spelling errors

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In WPF, is there an easy way to add wavy underlines (like spelling errors in Word) to FlowDocument elements? There’s the Underline class, but there seems to be no way to style it.

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  1. You can create the wavy effect using the following changes to Robert Macne’s solution

    Add a visual brush to the Grid.Resources section:

    <VisualBrush x:Key='WavyBrush' Viewbox='0,0,3,2' ViewboxUnits='Absolute' Viewport='0,0.8,6,4' ViewportUnits='Absolute' TileMode='Tile'>     <VisualBrush.Visual>         <Path Data='M 0,1 C 1,0 2,2 3,1' Stroke='Red' StrokeThickness='0.2' StrokeEndLineCap='Square' StrokeStartLineCap='Square' />     </VisualBrush.Visual> </VisualBrush>

    And change the pen to:

    <Pen Brush='{StaticResource WavyBrush}' Thickness='6' />
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