生成验证码

/// <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 }