<PackageReference Include="System.Drawing.Common" Version="10.0.4" />

Windows.Win32.Graphics.GdiPlus.LinearGradientMode

namespace Windows.Win32.Graphics.GdiPlus { internal enum LinearGradientMode { LinearGradientModeHorizontal, LinearGradientModeVertical, LinearGradientModeForwardDiagonal, LinearGradientModeBackwardDiagonal } }