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ASP.net 验证码(C#)/* Copyright all(c) 2005 ZhongFeng, http://blog.csdn.net/SW515*/public class ValidateCode : System.Web.UI.Page{private void Page_Load(object sender, System.EventArgs e){this.CreateCheckCodeImage(GenerateCheckCode());}#region web 窗体设计器生成的代码override protected void OnInit(EventArgs e){//// CODEGEN: 该调用是 asp.NET web 窗体设计器所必需的。//InitializeComponent();base.OnInit(e);}/// /// 设计器支持所需的方法 - 不要使用代码编辑器修改/// 此方法的内容。/// private void InitializeComponent(){this.Load += new System.EventHandler(this.Page_Load);}#endregionprivate 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));elsecode = (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();}}}关闭本页

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