Parameters
- appearance
- The appearance.
- fontUnderline
- A value indicating whether font is underlined.
Return Value
A new instance of TextShapeAppearance with changed property.
Target Platforms: .NET 10; .NET 9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5