C# 驗證碼

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using System;using System.Collections;using System.Data;using System.Linq;using System.Web;using System.Web.Services;using System.Web.Services.Protocols;using System.Xml.Linq;using System.Drawing;using System.Web.SessionState;namespace MT{    /// <summary>    /// $codebehindclassname$ 的摘要說明    /// </summary>    [WebService(Namespace = "http://tempuri.org/")]    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]    public class verCode : IHttpHandler, IRequiresSessionState    {        private Random RandomSeed = new Random();        public void ProcessRequest(HttpContext context)        {                       // 產生隨機數 iIlLoO0            string strWord = "23456789QWERTYUPASDFGHKXCVBNM";            string NumStr = null;            for (int i = 0; i < 5; i++)            {                NumStr += strWord[RandomSeed.Next(0, strWord.Length)];            }            //將驗證碼儲存到session中            context.Session["vcode"] = NumStr.ToLower();            CreateImages(context, NumStr);        }        #region 產生驗證碼圖片        private void CreateImages(HttpContext context,string checkCode)        {            int iwidth = (int)(checkCode.Length * 13);            System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 22);            Graphics g = Graphics.FromImage(image);            g.Clear(Color.White);            //定義顏色            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };            //定義字型            string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋體" };            Random rand = new Random();            //隨機輸出噪點            for (int i = 0; i < 50; i++)            {                int x = rand.Next(image.Width);                int y = rand.Next(image.Height);                g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);            }            //輸出不同字型和顏色的驗證碼字元            for (int i = 0; i < checkCode.Length; i++)            {                int cindex = rand.Next(7);                int findex = rand.Next(5);                Font f = new System.Drawing.Font(font[findex], 10, System.Drawing.FontStyle.Bold);                Brush b = new System.Drawing.SolidBrush(c[cindex]);                int ii = 4;                if ((i + 1) % 2 == 0)                {                    ii = 2;                }                g.DrawString(checkCode.Substring(i, 1), f, b, 2 + (i * 12), ii);            }            //畫一個邊框            g.DrawRectangle(new Pen(ColorTranslator.FromHtml("#CCCCCC"), 0), 0, 0, image.Width - 1, image.Height - 1);            //輸出到瀏覽器            System.IO.MemoryStream ms = new System.IO.MemoryStream();            image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);            context.Response.ClearContent();            //Response.ClearContent();            context.Response.ContentType = "image/gif";            context.Response.BinaryWrite(ms.ToArray());            g.Dispose();            image.Dispose();        }        #endregion        public bool IsReusable        {            get            {                return false;            }        }    }}

 

C# 驗證碼