using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; using System.Drawing.Imaging; using System.Drawing.Drawing2D;
//建立位图对象
public void randomNumber()
{ Bitmap newBitmap = new Bitmap(36,16,PixelFormat.Format32bppArgb); //根据上面创建的位图对象创建绘图面 Graphics g = Graphics.FromImage(newBitmap); //以指定的颜色填充矩形区 g.FillRectangle(new SolidBrush(Color.White), new Rectangle(0,0,36,16)); //创建字体对象 Font textFont = new Font("Times New Roman",10); //创建RectangleF结构指定一个区域 RectangleF rectangle = new RectangleF(0,0,36,16); //创建随机数对象 Random rd = new Random(); //取得随机数 int valationNo = 1000 + rd.Next(8999); //使用指定的颜色填充上面RectangleF结构指定的矩形区域 g.FillRectangle(new SolidBrush(Color.BurlyWood), rectangle); //在上面填充的矩形区域中填充上面生成的随机数 g.DrawString(valationNo.ToString(), textFont, new SolidBrush(Color.Blue), rectangle); //把创建的位图保存到指定的路径 newBitmap.Save(Server.MapPath("img")+"\\Img.gif", ImageFormat.Gif);