C#编程-129：Graphics对象

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace GDIPlusTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            //创建Graphics对象的三种方式：
            //方式一：
            Graphics g1 = e.Graphics;
            //方式二：
            Bitmap img = new Bitmap(200,200);
            Graphics g2 = Graphics.FromImage(img);
            //方式三：
            Graphics g3 = this.CreateGraphics();
            Pen pen = new Pen(Color.Red,5); //创建画笔        
            g3.DrawEllipse(pen,10,80,200,200);//绘制椭圆
            g3.Dispose();//释放画布
            //MessageBox.Show("Graphics对象创建成功");
        }
    }
}