在 网上找了一段获取验证码的代码不知道为什么验证码不能显示出来？大家帮忙看下，谢谢！！

Question

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private Image GetCodeImage(string path)
        {
            HttpWebRequest request = WebRequest.Create(string.Format("{0}",  path)) as HttpWebRequest;
            HttpWebResponse response = null;
            Stream stream = null;
            Image result = null;            request.Method = "GET";
            request.Referer = string.Format("{0}",path );
            request.UserAgent = "MSIE 6.0";
            CookieContainer cookie = new CookieContainer();
            request.CookieContainer = cookie;
            try
            {
                response = request.GetResponse() as HttpWebResponse;
                stream = response.GetResponseStream();
                cookie.Add(response.Cookies);
                result = Image.FromStream(stream);
                stream.Close();
            }
            catch (Exception e) { throw new Exception(e.Message + "," + e.TargetSite + "," + e.InnerException); }
            finally
            {
                if (response != null) response.Close();
            }
            return result;
        }        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.Image = GetCodeImage("http://passport.csdn.net/ShowExPwd.aspx?temp=fncsq4bm");
        }
    }
}

Answer 1

我也不看了,给你一个吧,这个还不错的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 Web_CheckCode : System.Web.UI.Page
{
        private void Page_Load(object sender, System.EventArgs e)
        {
            string checkcode = GenerateCheckCode();
             this.CreateCheckCodeImage(checkcode);
            Session["CheckCode"] = checkcode;        }        private string GenerateCheckCode()
        {
            int number;
            char code;
            string checkCode = String.Empty;            System.Random random = new Random();            for (int i = 0; i < 5; i++)
            {
                number = random.Next();                if (number % 2 == 0)
                    code = (char)('0' + (char)(number % 10));
                else
                    code = (char)('A' + (char)(number % 26));                checkCode += code.ToString();
            }            Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));            return checkCode;
        }        private void CreateCheckCodeImage(string checkCode)
        {
            if (checkCode == null || checkCode.Trim() == String.Empty)
                return;            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
            Graphics g = Graphics.FromImage(image);            try
            {
                //生成随机生成器
                Random random = new Random();                //清空图片背景色
                g.Clear(Color.White);                //画图片的背景噪音线
                for (int i = 0; i < 25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }                Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(checkCode, font, brush, 2, 2);                //画图片的前景噪音点
                for (int i = 0; i < 100; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                Response.ClearContent();
                Response.ContentType = "image/Gif";
                Response.BinaryWrite(ms.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
}

Answer 2

看清楚呢，楼主要的是获取验证码，不是生成我都用这个
http://www.cnblogs.com/hobe/archive/2007/03/14/674292.html
利用剪贴板
不会导致重新生成session

Answer 3

谢谢你提供的文章，确实不错
但是获取验证码好像是先通过webbrowser
然后再提取的。
但本人不想用webbrowser控件！
up！

Answer 4

仔细看了一下，又试一下，完全没有任何问题，额可以正常获取csdn验证码，确定你已经引用了对应的命名空间