C#之GDI+

1.使用Brushes填充矩形区域

 Graphics g = e.Graphics;
 g.FillRectangle(Brushes.Green, , , , ));

2.使用LinearGradientBrush填充矩形区域

 Color color1=Color.LightGray;
 Color color2=Color.Gray;
 Rectangle rect1=,,,);
 LinearGradientBrush brush1 = new LinearGradientBrush(rect1, color1, color2, LinearGradientMode.Vertical);
 g.FillRectangle(brush1, rect1);

3使用PathGradientBrush填充圆形区域

 GraphicsPath path=new GraphicsPath();
 path.AddEllipse(, , , ));
 PathGradientBrush brush3 = new PathGradientBrush(path);
 brush3.CenterColor = Color.Gray;
 Color[] colors=new Color[]{Color.LightGray};
 brush3.SurroundColors = colors;
 g.FillEllipse(brush3, , , , ));