c#获取Graphics对象

命名空间

using System.Drawing;
using System.Drawing.Drawing2D;

Graphics对象不能通过 new 创建

<span style="color:#ff0000;"><del>Graphics g = new Graphics();</del></span>

一般通过如下方式获得Graphics对象：

Form的paint事件

private void form_Pain(object sender,PainEventargs e){Graphics g = e.Graphics;}

重写Form.OnPaint方法

Graphics.FromImage(img);
Graphics.FromHwnd(form.Handle);
Graphics.FromHdc(dc);

protected override void OnPaint(PaintEventArgs e){Graphics g = e.Graphics;}

From的CreateGraphics方法

using(Graphics g = this.CreateGraphics()){g.Dispose();}

Graphis类的静态方法

Graphics.FromImage(img);
Graphics.FromHwnd(form.Handle);
Graphics.FromHdc(dc)