C#生成验证码

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以下是c#生成验证码的代码。
using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace BitCar.Finance.C2C.Common{   public class ValidateCodeHelper    {        //// <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)        {            //定义一个包括数字、大写英文字母和小写英文字母的字符串            string strchar = "0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,6,8";            //将strchar字符串转化为数组            //String.Split 方法返回包含此实例中的子字符串（由指定Char数组的元素分隔）的 String 数组。            string[] VcArray = strchar.Split(',');            string VNum = "";            //记录上次随机数值，尽量避免产生几个一样的随机数                       int temp = -1;            //采用一个简单的算法以保证生成随机数的不同            Random rand = new Random();            for (int i = 1; i < length + 1; i++)            {                if (temp != -1)                {                    //unchecked 关键字用于取消整型算术运算和转换的溢出检查。                    //DateTime.Ticks 属性获取表示此实例的日期和时间的刻度数。                    rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));                }                //Random.Next 方法返回一个小于所指定最大值的非负随机数。                int t = rand.Next(61);                if (temp != -1 && temp == t)                {                    return CreateValidateCode(length);                }                temp = t;                VNum += VcArray[t];            }            return VNum;//返回生成的随机数        }        // <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 imge = new Bitmap(validateCode.Length * 12 + 10, 22);            Graphics g = Graphics.FromImage(imge);            try            {                Random random = new Random();                g.Clear(Color.White);                for (int i = 0; i < 25; i++)                {                    int x1 = random.Next(imge.Width);                    int x2 = random.Next(imge.Width);                    int y1 = random.Next(imge.Height);                    int y2 = random.Next(imge.Height);                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);                }                Font font = new Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic));                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, imge.Width, imge.Height), Color.BlueViolet, Color.Crimson, 1.2f, true);                g.DrawString(validateCode, font, brush, 2, 2);                for (int i = 1; i < 80; i++)                {                    int x = random.Next(imge.Width);                    int y = random.Next(imge.Height);                    imge.SetPixel(x, y, Color.FromArgb(random.Next()));                }                g.DrawRectangle(new Pen(Color.Silver), 0, 0, imge.Width - 1, imge.Height - 1);                //保存图片数据                MemoryStream stream = new MemoryStream();                imge.Save(stream, ImageFormat.Jpeg);                //输出图片流                return stream.ToArray();            }            finally            {                g.Dispose();                imge.Dispose();            }        }        // <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[] CreateValidateGraphic2(string validateCode)        {            Bitmap imge = new Bitmap(validateCode.Length * 12 + 50, 40);            Graphics g = Graphics.FromImage(imge);            try            {                Random random = new Random();                g.Clear(Color.FromArgb(238, 238, 238));                //for (int i = 0; i < 25; i++)                //{                //    int x1 = random.Next(imge.Width);                //    int x2 = random.Next(imge.Width);                //    int y1 = random.Next(imge.Height);                //    int y2 = random.Next(imge.Height);                //    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);                //}                Font font = new Font("微软雅黑", 22, (FontStyle.Regular));                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, imge.Width, imge.Height), Color.Black, Color.Black, 1.2f, true);                g.DrawString(validateCode, font, brush, 2, 2);                //for (int i = 1; i < 80; i++)                //{                //    int x = random.Next(imge.Width);                //    int y = random.Next(imge.Height);                //    imge.SetPixel(x, y, Color.FromArgb(random.Next()));                //}                g.DrawRectangle(new Pen(Color.FromArgb(238, 238, 238)), 0, 0, imge.Width - 1, imge.Height - 1);                //保存图片数据                MemoryStream stream = new MemoryStream();                imge.Save(stream, ImageFormat.Jpeg);                //输出图片流                return stream.ToArray();            }            finally            {                g.Dispose();                imge.Dispose();            }        }    }}
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