主题：如何直接保存并调用GDI+绘制的图片

绘制之前，将背景设置为白色：

Dim p As WinForm.Painter = e.Form.Controls("Painter1")
Dim g As Graphics = p.Graphics
g.Clear(Color.White)
g.DrawArc(Pens.Red, 0, 0, 30, 40, 0, 135)
g.DrawEllipse(Pens.Blue, 20, 20, 90, 45)
p.Repaint() '显示绘制好的图片
p.Save("c:\data\abc.jpg")