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C#生成随机验证码代码分享

暨宸
2023-03-14
本文向大家介绍C#生成随机验证码代码分享,包括了C#生成随机验证码代码分享的使用技巧和注意事项,需要的朋友参考一下

使用YZMHelper帮助类即可


using System;

using System.Web;

using System.Drawing;

using System.Security.Cryptography;

namespace ProjectWenDangManage.Framework {     /// <summary>     /// 验证码类     /// </summary>     public class Rand     {         #region 生成随机数字         /// <summary>         /// 生成随机数字         /// </summary>         /// <param name="length">生成长度</param>         public static string Number(int Length)         {             return Number(Length, false);         }

        /// <summary>         /// 生成随机数字         /// </summary>         /// <param name="Length">生成长度</param>         /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>         public static string Number(int Length, bool Sleep)         {             if (Sleep) System.Threading.Thread.Sleep(3);             string result = "";             System.Random random = new Random();             for (int i = 0; i < Length; i++)             {                 result += random.Next(10).ToString();             }             return result;         }         #endregion

        #region 生成随机字母与数字         /// <summary>         /// 生成随机字母与数字         /// </summary>         /// <param name="IntStr">生成长度</param>         public static string Str(int Length)         {             return Str(Length, false);         }

        /// <summary>         /// 生成随机字母与数字         /// </summary>         /// <param name="Length">生成长度</param>         /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>         public static string Str(int Length, bool Sleep)         {             if (Sleep) System.Threading.Thread.Sleep(3);             char[] Pattern = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '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' };             string result = "";             int n = Pattern.Length;             System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));             for (int i = 0; i < Length; i++)             {                 int rnd = random.Next(0, n);                 result += Pattern[rnd];             }             return result;         }         #endregion

        #region 生成随机纯字母随机数         /// <summary>         /// 生成随机纯字母随机数         /// </summary>         /// <param name="IntStr">生成长度</param>         public static string Str_char(int Length)         {             return Str_char(Length, false);         }

        /// <summary>         /// 生成随机纯字母随机数         /// </summary>         /// <param name="Length">生成长度</param>         /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>         public static string Str_char(int Length, bool Sleep)         {             if (Sleep) System.Threading.Thread.Sleep(3);             char[] Pattern = new char[] { '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' };             string result = "";             int n = Pattern.Length;             System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));             for (int i = 0; i < Length; i++)             {                 int rnd = random.Next(0, n);                 result += Pattern[rnd];             }             return result;         }         #endregion     }

    /// <summary>     /// 验证图片类     /// </summary>     public class YZMHelper     {         #region 私有字段         private string text;         private Bitmap image;         private int letterCount = 4;   //验证码位数         private int letterWidth = 16;  //单个字体的宽度范围         private int letterHeight = 20; //单个字体的高度范围         private static byte[] randb = new byte[4];         private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();         private Font[] fonts =     {        new Font(new FontFamily("Times New Roman"),10 +Next(1),System.Drawing.FontStyle.Regular),        new Font(new FontFamily("Georgia"), 10 + Next(1),System.Drawing.FontStyle.Regular),        new Font(new FontFamily("Arial"), 10 + Next(1),System.Drawing.FontStyle.Regular),        new Font(new FontFamily("Comic Sans MS"), 10 + Next(1),System.Drawing.FontStyle.Regular)     };         #endregion

        #region 公有属性         /// <summary>         /// 验证码         /// </summary>         public string Text         {             get { return this.text; }         }

        /// <summary>         /// 验证码图片         /// </summary>         public Bitmap Image         {             get { return this.image; }         }         #endregion

        #region 构造函数         public YZMHelper()         {             HttpContext.Current.Response.Expires = 0;             HttpContext.Current.Response.Buffer = true;             HttpContext.Current.Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1);             HttpContext.Current.Response.AddHeader("pragma", "no-cache");             HttpContext.Current.Response.CacheControl = "no-cache";             this.text = Rand.Number(4);             CreateImage();         }         #endregion

        #region 私有方法         /// <summary>         /// 获得下一个随机数         /// </summary>         /// <param name="max">最大值</param>         private static int Next(int max)         {             rand.GetBytes(randb);             int value = BitConverter.ToInt32(randb, 0);             value = value % (max + 1);             if (value < 0) value = -value;             return value;         }

        /// <summary>         /// 获得下一个随机数         /// </summary>         /// <param name="min">最小值</param>         /// <param name="max">最大值</param>         private static int Next(int min, int max)         {             int value = Next(max - min) + min;             return value;         }         #endregion

        #region 公共方法         /// <summary>         /// 绘制验证码         /// </summary>         public void CreateImage()         {             int int_ImageWidth = this.text.Length * letterWidth;             Bitmap image = new Bitmap(int_ImageWidth, letterHeight);             Graphics g = Graphics.FromImage(image);             g.Clear(Color.White);             for (int i = 0; i < 2; i++)             {                 int x1 = Next(image.Width - 1);                 int x2 = Next(image.Width - 1);                 int y1 = Next(image.Height - 1);                 int y2 = Next(image.Height - 1);                 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);             }             int _x = -12, _y = 0;             for (int int_index = 0; int_index < this.text.Length; int_index++)             {                 _x += Next(12, 16);                 _y = Next(-2, 2);                 string str_char = this.text.Substring(int_index, 1);                 str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper();                 Brush newBrush = new SolidBrush(GetRandomColor());                 Point thePos = new Point(_x, _y);                 g.DrawString(str_char, fonts[Next(fonts.Length - 1)], newBrush, thePos);             }             for (int i = 0; i < 10; i++)             {                 int x = Next(image.Width - 1);                 int y = Next(image.Height - 1);                 image.SetPixel(x, y, Color.FromArgb(Next(0, 255), Next(0, 255), Next(0, 255)));             }             image = TwistImage(image, true, Next(1, 3), Next(4, 6));             g.DrawRectangle(new Pen(Color.LightGray, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1));             this.image = image;         }

        /// <summary>         /// 字体随机颜色         /// </summary>         public Color GetRandomColor()         {             Random RandomNum_First = new Random((int)DateTime.Now.Ticks);             System.Threading.Thread.Sleep(RandomNum_First.Next(50));             Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);             int int_Red = RandomNum_First.Next(180);             int int_Green = RandomNum_Sencond.Next(180);             int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green;             int_Blue = (int_Blue > 255) ? 255 : int_Blue;             return Color.FromArgb(int_Red, int_Green, int_Blue);         }

        /// <summary>         /// 正弦曲线Wave扭曲图片         /// </summary>         /// <param name="srcBmp">图片路径</param>         /// <param name="bXDir">如果扭曲则选择为True</param>         /// <param name="nMultValue">波形的幅度倍数,越大扭曲的程度越高,一般为3</param>         /// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>         public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)         {             double PI = 6.283185307179586476925286766559;             Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);             Graphics graph = Graphics.FromImage(destBmp);             graph.FillRectangle(new SolidBrush(Color.White), 0, 0, destBmp.Width, destBmp.Height);             graph.Dispose();             double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;             for (int i = 0; i < destBmp.Width; i++)             {                 for (int j = 0; j < destBmp.Height; j++)                 {                     double dx = 0;                     dx = bXDir ? (PI * (double)j) / dBaseAxisLen : (PI * (double)i) / dBaseAxisLen;                     dx += dPhase;                     double dy = Math.Sin(dx);                     int nOldX = 0, nOldY = 0;                     nOldX = bXDir ? i + (int)(dy * dMultValue) : i;                     nOldY = bXDir ? j : j + (int)(dy * dMultValue);

                    Color color = srcBmp.GetPixel(i, j);                     if (nOldX >= 0 && nOldX < destBmp.Width                      && nOldY >= 0 && nOldY < destBmp.Height)                     {                         destBmp.SetPixel(nOldX, nOldY, color);                     }                 }             }             srcBmp.Dispose();             return destBmp;         }         #endregion     } }

使用例子


 //实例化YZMHelper

 YZMHelper y = new YZMHelper();

 //然后通过CreateImage()绘制验证码

 y.CreateImage();

 //通过y.Text得到产生的验证码

 TempData["Yzm"] = y.Text;

 //通过y.Image得到产生的验证码图片

 System.Drawing.Bitmap b = y.Image;

 //将验证码突破保存到知道路径下

 b.Save(path, System.Drawing.Imaging.ImageFormat.Png);


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