纸上得来终觉浅，绝知此事要躬行。

 

随机图片

aspx 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FreshImg.aspx.cs" Inherits="FreshImg" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>随机图像</title>
    <!--每2秒刷新-->
    <meta http-equiv="refresh" content="2" />
</head>
<body>
    <form id="form1" runat="server" >
    <div>
        <img ID="DTImg" runat="server" />
    </div>
    </form>
</body>
</html>

 

aspx.cs 
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;

public partial class FreshImg : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DTImg.Src = CreateImage();
    }
    public string CreateImage()
    {
        //创建Graphics对象
        Bitmap backimg = new Bitmap(800, 600);
        Graphics g = Graphics.FromImage(backimg);
        //通过产生随机数来确定随机位置
        int x = 0, y = 0;
        Random r = new Random();
        g.Clear(Color.White);
        //显示各图标
        Bitmap dyimg = new Bitmap(Server.MapPath("sampledi.gif"));
        for (int i = 0; i < 5; i++)
            g.DrawImage(dyimg, x + r.Next(300), y + r.Next(300));
        //存储页面图像
        string imgpath = Server.MapPath("sample.gif");
        backimg.Save(imgpath, System.Drawing.Imaging.ImageFormat.Gif);
        return imgpath;
    }
}

 

posted on 2010-09-23 21:31  JRoger  阅读(304)  评论(0)  编辑  收藏  举报

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