C# 产生验证码 利用背景图片绘制
/// <summary> /// 获取验证码【字符串】 /// </summary> /// <param name="Length">验证码长度【必须大于0】</param> /// <returns></returns> public static string VerficationText(int Length) { char[] _verfication=new char[Length]; Random _random = new Random(); char[] _dictionary = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; for (int i = 0; i < Length; i++) { _verfication[i] = _dictionary[_random.Next(_dictionary.Length - 1)]; } return new string(_verfication); }
/// <summary> /// 产生验证码方法 /// </summary> /// <returns></returns> public void VerificationCode() { int _verificationLength = 6; int _width = 100, _height = 20; SizeF _verificationTextSize; string path = Server.MapPath("~/Skins/Commmon/Texture.jpg");//使用一张背景图 Bitmap _bitmap = new Bitmap(path); TextureBrush _brush = new TextureBrush(_bitmap); //获取验证码 string _verificationText = VerficationText(_verificationLength); //储存验证码 Session["VerificationCode"] = _verificationText.ToUpper(); Font _font = new Font("Arial", 14, FontStyle.Bold); Bitmap _image = new Bitmap(_width, _height); Graphics _g = Graphics.FromImage(_image); //清空背景色 _g.Clear(Color.White); //绘制验证码 _verificationTextSize = _g.MeasureString(_verificationText, _font); _g.DrawString(_verificationText, _font, _brush, (_width - _verificationTextSize.Width) / 2, (_height - _verificationTextSize.Height) / 2); _image.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); }
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