糙点验证码！

    大家好，好久没做网页的东西了。所以也没有用到关于验证码的模块和功能。今天捡起来看了看。感觉应该怀旧一下。好大家分享一下这个简单的验证码。如果有不对和不妥的地方 请大家 指教哦。不多说了。看一下的代码吧！

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 checkcode : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        CreateCheckCodeImage(GenerateCheckCode());

    }

 

    private string GenerateCheckCode()

    {

        int number;

        char code;

        string checkCode = String.Empty;

        System.Random random = new Random();

 

        for (int i = 0; i < 4; 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 < 2; 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.Black), 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();

        }

    }

}