Ниже приведены примеры обоих направлений конвертации:
Drawing.Color
в Windows.Media.Color
// This is your color to convert from
System.Drawing.Color color;
System.Windows.Media.Color newColor = System.Windows.Media.Color.FromArgb(color.A, color.R, color.G, color.B);
Windows.Media.Color
вDrawing.Color
// This is your color to convert from
System.Windows.Media.Color color;
System.Drawing.Color newColor = System.Drawing.Color.FromArgb(color.A, color.R, color.G, color.B);