/// <summary> /// 生成验证码 /// </summary> public partial class OperateContext { #region 1.生成验证码 +string GenerateCode(int count, VCodeTypeEnum type) public string GenerateCode(int count, VCodeTypeEnum type) { ValidateCode validateCode = new ValidateCode(); string code = validateCode.CreateValidateCode(count); Session[type.ToString()] = code; return code; } #endregion #region 2.生成验证码图片 +byte[] GenerateCode(VCodeTypeEnum type, int count = 4) /// <summary> /// 2.生成验证码图片 /// </summary> /// <param name="type"></param> /// <param name="count"></param> /// <returns></returns> public byte[] GenerateCode(VCodeTypeEnum type, int count = 4) { ValidateCode validateCode = new ValidateCode(); string code = validateCode.CreateValidateCode(count); Session[type.ToString()] = code; CallContext.SetData(type.ToString(), code); return validateCode.CreateValidateGraphic(code); } #endregion #region 3.生成验证码 并返回图片 +byte[] GenerateCode(VCodeTypeEnum type, int count = 4) /// <summary> /// 生成验证码 并返回图片 /// </summary> /// <param name="type"></param> /// <param name="count"></param> /// <param name="bytes"></param> /// <returns></returns> public string GenerateCode(VCodeTypeEnum type, int count, out byte[] bytes) { ValidateCode validateCode = new ValidateCode(); string code = validateCode.CreateValidateCode(count); Session[type.ToString()] = code; bytes = validateCode.CreateValidateGraphic(code); return code; } #endregion #region 4.验证码校验 +bool CheckVCode(VCodeTypeEnum type, string num) /// <summary> /// 4.验证码校验 /// </summary> /// <param name="type"></param> /// <param name="num"></param> /// <returns></returns> public bool CheckVCode(VCodeTypeEnum type, string num) { string vcode = type.ToString(); string cnum = Session[vcode] == null ? "" : Session[vcode].ToString(); if (num == cnum && !string.IsNullOrEmpty(num)) { return true; } else { return false; } } #endregion } public class ValidateCode { /// <summary> /// 验证码的最大长度 /// </summary> public int MaxLength { get { return 10; } } /// <summary> /// 验证码的最小长度 /// </summary> public int MinLength { get { return 1; } } /// <summary> /// 生成验证码 /// </summary> /// <param name="length">指定验证码的长度</param> /// <returns></returns> public string CreateValidateCode(int length) { int[] randMembers = new int[length]; int[] validateNums = new int[length]; string validateNumberStr = ""; //生成起始序列值 int seekSeek = unchecked((int)DateTime.Now.Ticks); Random seekRand = new Random(seekSeek); int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000); int[] seeks = new int[length]; for (int i = 0; i < length; i++) { beginSeek += 10000; seeks[i] = beginSeek; } //生成随机数字 for (int i = 0; i < length; i++) { Random rand = new Random(seeks[i]); int pownum = 1 * (int)Math.Pow(10, length); randMembers[i] = rand.Next(pownum, Int32.MaxValue); } //抽取随机数字 for (int i = 0; i < length; i++) { string numStr = randMembers[i].ToString(); int numLength = numStr.Length; Random rand = new Random(); int numPosition = rand.Next(0, numLength - 1); validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1)); } //生成验证码 for (int i = 0; i < length; i++) { validateNumberStr += validateNums[i].ToString(); } return validateNumberStr; } //C# MVC 升级版 /// <summary> /// 创建验证码的图片 /// </summary> /// <param name="containsPage">要输出到的page对象</param> /// <param name="validateNum">验证码</param> public byte[] CreateValidateGraphic(string validateCode) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 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); //画图片的干扰线 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 Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic)); LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(validateCode, font, brush, 3, 2); //画图片的前景干扰点 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); //保存图片数据 MemoryStream stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); //输出图片流 return stream.ToArray(); } finally { g.Dispose(); image.Dispose(); } } /// <summary> /// 得到验证码图片的长度 /// </summary> /// <param name="validateNumLength">验证码的长度</param> /// <returns></returns> public static int GetImageWidth(int validateNumLength) { return (int)(validateNumLength * 12.0); } /// <summary> /// 得到验证码的高度 /// </summary> /// <returns></returns> public static double GetImageHeight() { return 22.5; } } public enum VCodeTypeEnum {login,phone, password,register,email }