急！ 如何在IMAGE上面画一个矩形框或者别的图形？？

Question

你可先加工图片．
或者加边框　:<img border=2px

Answer 1

using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
Bitmap bm = new Bitmap(400,400);
Graphics g = Graphics.FromImage(bm);
g.Clear(Color.White);
g.DrawRectangle(Pens.Black,0,0,100,100); // 矩形
//g.DrawArc(Pens.Black,0,0,40,40,45F,270F); // 椭圆的一部分
//g.DrawLine(Pens.Red,new Point(0,0),new Point(100,100)); // 直线
Point ab=new Point(20,10);
bm.Save(Response.OutputStream,System.Drawing.Imaging.ImageFormat.Gif);
bm.Dispose();
g.Dispose();