综合应用下载图片（二）

来源：互联网发布：jquery 二维数组排序编辑：程序博客网时间：2024/05/16 12:48

验证码生成处理页面：CheckCode.ashx

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;

namespace ASP.Net中级
{
    /// <summary>
    /// CheckCode 的摘要说明
    /// </summary>
    public class CheckCode : IHttpHandler, IRequiresSessionState
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "image/JPEG";
            using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(100, 50))
            {
                using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
                {
                     //通过随机数来动态生成验证码
                    Random rand = new Random();
                    int code = rand.Next(10000, 99999);
                    string strCode = Convert.ToString(code);
                    HttpContext.Current.Session["code"] = strCode;
                    g.DrawString(strCode, new System.Drawing.Font("宋体", 20), System.Drawing.Brushes.Green, new System.Drawing.PointF(0, 0));
                    bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
                }
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}