using System.Windows.Media;
//String转换成Color
Color color = (Color)ColorConverter.ConvertFromString(string);
//String转换成Brush
BrushConverter brushConverter = new BrushConverter();
Brush brush = (Brush)brushConverter.ConvertFromString(string);
//Color转换成Brush
Brush brush = new SolidColorBrush(color));
//Brush转换成Color有两种方法:
//先将Brush转成string,再转成Color。
Color color= (Color)ColorConverter.ConvertFromString(brush.ToString());
//将Brush转成SolidColorBrush,再取Color。
Color color= ((SolidColorBrush)CadColor.Background).Color;