LinearGradientBrush对象用颜色线性渐变填充图形。简言之，颜色渐变包含一种在两种指定的颜色之间渐变的颜色，渐变的方向是沿着指定角度的直线路径。例如：
1
private
void
Form1_Paint(
object
sender, PaintEventArgs e)
2 {
3 Graphics g = e.Graphics;
4 LinearGradientBrush lgb = new LinearGradientBrush( new Point( 0 , 0 ),
5 new Point( 50 , 10 ),
6 Color.White,
7 Color.Black);
8 g.FillRectangle(lgb, this .ClientRectangle);
9 lgb.Dispose();
10 }
2 {
3 Graphics g = e.Graphics;
4 LinearGradientBrush lgb = new LinearGradientBrush( new Point( 0 , 0 ),
5 new Point( 50 , 10 ),
6 Color.White,
7 Color.Black);
8 g.FillRectangle(lgb, this .ClientRectangle);
9 lgb.Dispose();
10 }
图形为：
使用矩形渐变：
1
private
void
Form1_Paint(
object
sender, PaintEventArgs e)
2 {
3 Graphics g = e.Graphics;
4 LinearGradientBrush lgb = new LinearGradientBrush( new Rectangle( 0 , 0 , 50 , 50 ),
5 Color.White,
6 Color.Black,
7 75f); // 75f 表示角度
8 g.FillRectangle(lgb, this .ClientRectangle);
9 lgb.Dispose();
10 }
2 {
3 Graphics g = e.Graphics;
4 LinearGradientBrush lgb = new LinearGradientBrush( new Rectangle( 0 , 0 , 50 , 50 ),
5 Color.White,
6 Color.Black,
7 75f); // 75f 表示角度
8 g.FillRectangle(lgb, this .ClientRectangle);
9 lgb.Dispose();
10 }
图形为：
