csharp:VerifyCode in winform or webform

winform:

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Drawing.Drawing2D; using System.Web;   namespace PrintLetterspacing {       /// <summary>     ///     /// </summary>     public partial class Form4 : Form     {         public string code = "";         /// <summary>         ///         /// </summary>         public Form4()         {             InitializeComponent();         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void Form4_Load(object sender, EventArgs e)         {             code = CreateVerifyCode();                //取随机码               //1.win             System.IO.MemoryStream ms = new System.IO.MemoryStream();             Bitmap image = this.CreateImageCode(code);             this.pictureBox1.Image = image;                 //2.web             //CreateImageOnPage(code, this.Context);       // 输出图片             //Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper()));// 使用Cookies取验证码的         }           /// <summary>         /// 生成验证码         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button1_Click(object sender, EventArgs e)         {             code = CreateVerifyCode();                //取随机码               //1.win             System.IO.MemoryStream ms = new System.IO.MemoryStream();             Bitmap image = this.CreateImageCode(code);             this.pictureBox1.Image = image;         }         /// <summary>         /// 验证验证码         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button2_Click(object sender, EventArgs e)         {             if (txtUserCode.Text.Trim().Equals(code.ToLower()))             {                 MessageBox.Show("ok");             }             else             {                 MessageBox.Show("failure");             }          }           #region 验证码长度(默认4个验证码的长度)         int length = 4;         public int Length         {             get { return length; }             set { length = value; }         }         #endregion           #region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)         int fontSize = 40;         public int FontSize         {             get { return fontSize; }             set { fontSize = value; }         }         #endregion           #region 边框补(默认1像素)         int padding = 2;         public int Padding         {             get { return padding; }             set { padding = value; }         }         #endregion           #region 是否输出燥点(默认不输出)         bool chaos = true;         public bool Chaos         {             get { return chaos; }             set { chaos = value; }         }         #endregion           #region 输出燥点的颜色(默认灰色)         Color chaosColor = Color.LightGray;         public Color ChaosColor         {             get { return chaosColor; }             set { chaosColor = value; }         }         #endregion           #region 自定义背景色(默认白色)         Color backgroundColor = Color.White;         public Color BackgroundColor         {             get { return backgroundColor; }             set { backgroundColor = value; }         }         #endregion           #region 自定义随机颜色数组         Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };         public Color[] Colors         {             get { return colors; }             set { colors = value; }         }         #endregion           #region 自定义字体数组         string[] fonts = { "Arial", "Georgia" };         public string[] Fonts         {             get { return fonts; }             set { fonts = value; }         }         #endregion           #region 自定义随机码字符串序列(使用逗号分隔)         //string codeSerial = "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,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 codeSerial = "阿,保,持,的,法,规,和,东,三,省,问,我,惹,你,诶,没,改,变,揍,屁,股,吧,涂,聚,文,中,国";         public string CodeSerial         {             get { return codeSerial; }             set { codeSerial = value; }         }         #endregion           #region 产生波形滤镜效果           private const double PI = 3.1415926535897932384626433832795;         private const double PI2 = 6.283185307179586476925286766559;           /// <summary>         /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）         /// </summary>         /// <param name="srcBmp">图片路径</param>         /// <param name="bXDir">如果扭曲则选择为True</param>         /// <param name="dMultValue">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>         /// <returns></returns>         public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)         {             System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);               // 将位图背景填充为白色             System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);             graph.FillRectangle(new SolidBrush(System.Drawing.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 ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;                     dx += dPhase;                     double dy = Math.Sin(dx);                       // 取得当前点的颜色                     int nOldX = 0, nOldY = 0;                     nOldX = bXDir ? i + (int)(dy * dMultValue) : i;                     nOldY = bXDir ? j : j + (int)(dy * dMultValue);                       System.Drawing.Color color = srcBmp.GetPixel(i, j);                     if (nOldX >= 0 && nOldX < destBmp.Width                      && nOldY >= 0 && nOldY < destBmp.Height)                     {                         destBmp.SetPixel(nOldX, nOldY, color);                     }                 }             }             return destBmp;         }         #endregion           #region 生成校验码图片         public Bitmap CreateImageCode(string code)         {             int fSize = FontSize;             int fWidth = fSize + Padding;               int imageWidth = (int)(code.Length * fWidth) + 30 + Padding * 2;             int imageHeight = fSize * 2 + Padding;               System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);               Graphics g = Graphics.FromImage(image);               g.Clear(BackgroundColor);               Random rand = new Random();               //给背景添加随机生成的燥点             if (this.Chaos)             {                   Pen pen = new Pen(ChaosColor, 0);                 int c = Length * 10;                   for (int i = 0; i < c; i++)                 {                     int x = rand.Next(image.Width);                     int y = rand.Next(image.Height);                       g.DrawRectangle(pen, x, y, 1, 1);                 }             }               int left = 0, top = 0, top1 = 1, top2 = 1;               int n1 = (imageHeight - FontSize - Padding * 2);             int n2 = n1 / 4;             top1 = n2;             top2 = n2 * 2;               Font f;             Brush b;               int cindex, findex;               //随机字体和颜色的验证码字符             for (int i = 0; i < code.Length; i++)             {                 cindex = rand.Next(Colors.Length - 1);                 findex = rand.Next(Fonts.Length - 1);                   f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);                 b = new System.Drawing.SolidBrush(Colors[cindex]);                   if (i % 2 == 1)                 {                     top = top2;                 }                 else                 {                     top = top1;                 }                   left = i * fWidth;                   g.DrawString(code.Substring(i, 1), f, b, left, top);             }               //画一个边框 边框颜色为Color.Gainsboro             g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);             g.Dispose();               //产生波形（Add By 51aspx.com）             image = TwistImage(image, true, 8, 4);               return image;         }         #endregion           #region 将创建好的图片输出到页面         /// <summary>         ///         /// </summary>         /// <param name="code"></param>         /// <param name="context"></param>         public void CreateImageOnPage(string code, HttpContext context)         {             System.IO.MemoryStream ms = new System.IO.MemoryStream();             Bitmap image = this.CreateImageCode(code);               image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);               context.Response.ClearContent();             context.Response.ContentType = "image/Jpeg";             context.Response.BinaryWrite(ms.GetBuffer());               ms.Close();             ms = null;             image.Dispose();             image = null;         }         #endregion           #region 生成随机字符码         public string CreateVerifyCode(int codeLen)         {             if (codeLen == 0)             {                 codeLen = Length;             }               string[] arr = CodeSerial.Split(',');               string code = "";               int randValue = -1;               Random rand = new Random(unchecked((int)DateTime.Now.Ticks));               for (int i = 0; i < codeLen; i++)             {                 randValue = rand.Next(0, arr.Length - 1);                   code += arr[randValue];             }               return code;         }         public string CreateVerifyCode()         {             return CreateVerifyCode(0);         }         #endregion         } }

　　webform:

 

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458

using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Drawing; using System.Text; using System.Drawing.Drawing2D;   namespace WebVerificationCode {     /// <summary>     /// C#生成中文汉字验证码源码     /// </summary>     public partial class codepng : System.Web.UI.Page     {         string gif = "";         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         protected void Page_Load(object sender, EventArgs e)         {             switch (Request.QueryString["code"])             {                 case "1":                     gif = stxt(5);                     Session["gif"] = gif;// stxt(5);                     break;                 case "2":                     gif = GetRandomint(4);                     Session["gif"] = gif;// GetRandomint(4);                     break;                 case "3":                     gif = CreateRandomCode(4);                     Session["gif"] = gif;// CreateRandomCode(4);                     break;                 default:                     gif = CreateRandomCode(4);                     Session["gif"] = gif;// CreateRandomCode(4);                     break;             }             CreateImage(Session["gif"].ToString());         }         /// <summary>         ///         /// </summary>         /// <param name="codeCount"></param>         /// <returns></returns>         private String GetRandomint(int codeCount)         {             Random random = new Random();             string min = "";             string max = "";             for (int i = 0; i < codeCount; i++)             {                 min += "1";                 max += "9";             }             return (random.Next(Convert.ToInt32(min), Convert.ToInt32(max)).ToString());         }         /**/         /*     此函数在汉字编码范围内随机创建含两个元素的十六进制字节数组，每个字节数组代表一个汉字，并将     四个字节数组存储在object数组中。     参数：strlength，代表需要产生的汉字个数     */         /// <summary>         ///         /// </summary>         /// <param name="strlength"></param>         /// <returns></returns>         public static object[] CreateRegionCode(int strlength)         {             //定义一个字符串数组储存汉字编码的组成元素             string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };             Random rnd = new Random();             //定义一个object数组用来             object[] bytes = new object[strlength];             /**/             /*每循环一次产生一个含两个元素的十六进制字节数组，并将其放入bject数组中         每个汉字有四个区位码组成         区位码第1位和区位码第2位作为字节数组第一个元素         区位码第3位和区位码第4位作为字节数组第二个元素         */             for (int i = 0; i < strlength; i++)             {                 //区位码第1位                 int r1 = rnd.Next(11, 14);                 string str_r1 = rBase[r1].Trim();                 //区位码第2位                 rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的种子避免产生重复值                 int r2;                 if (r1 == 13)                 {                     r2 = rnd.Next(0, 7);                 }                 else                 {                     r2 = rnd.Next(0, 16);                 }                 string str_r2 = rBase[r2].Trim();                 //区位码第3位                 rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i);                 int r3 = rnd.Next(10, 16);                 string str_r3 = rBase[r3].Trim();                 //区位码第4位                 rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i);                 int r4;                 if (r3 == 10)                 {                     r4 = rnd.Next(1, 16);                 }                 else if (r3 == 15)                 {                     r4 = rnd.Next(0, 15);                 }                 else                 {                     r4 = rnd.Next(0, 16);                 }                 string str_r4 = rBase[r4].Trim();                 //定义两个字节变量存储产生的随机汉字区位码                 byte byte1 = Convert.ToByte(str_r1 + str_r2, 16);                 byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);                 //将两个字节变量存储在字节数组中                 byte[] str_r = new byte[] { byte1, byte2 };                 //将产生的一个汉字的字节数组放入object数组中                 bytes.SetValue(str_r, i);             }             return bytes;         }         /// <summary>         ///         /// </summary>         /// <param name="num"></param>         /// <returns></returns>         private string stxt(int num)         {             Encoding gb = Encoding.GetEncoding("gb2312");             //调用函数产生10个随机中文汉字编码             object[] bytes = CreateRegionCode(num);             string strtxt = "";             //根据汉字编码的字节数组解码出中文汉字             for (int i = 0; i < num; i++)             {                                  strtxt += gb.GetString((byte[])Convert.ChangeType(bytes[i], typeof(byte[])));             }             return strtxt;         }         /// <summary>         /// 这个是使用字母,数字混合         /// </summary>         /// <param name="VcodeNum"></param>         /// <returns></returns>         private string CreateRandomCode(int codeCount)         {             string allChar = "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,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";             string[] allCharArray = allChar.Split(',');             string randomCode = "";             int temp = -1;             Random rand = new Random();             for (int i = 0; i < codeCount; i++)             {                 if (temp != -1)                 {                     rand = new Random(i * temp * ((int)DateTime.Now.Ticks));                 }                 int t = rand.Next(61);                 if (temp == t)                 {                     return CreateRandomCode(codeCount);                 }                 temp = t;                 randomCode += allCharArray[t];             }             return randomCode;         }         /// <summary>         ///         /// </summary>         /// <param name="checkCode"></param>         private void CreateImage(string checkCode)         {             int iwidth = (int)(checkCode.Length * 20);             //1             //System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 25);             //Graphics g = Graphics.FromImage(image);             //Font f = new System.Drawing.Font("Arial", 10, System.Drawing.FontStyle.Bold);             //Brush b = new System.Drawing.SolidBrush(Color.White);             ////g.FillRectangle(new System.Drawing.SolidBrush(Color.Blue),0,0,image.Width, image.Height);               //g.Clear(Color.Black);             //g.DrawString(checkCode, f, b, 3, 3);             //Pen blackPen = new Pen(Color.Black, 0);             //Random rand = new Random();             ////for (int i=0;i<5;i++)               ////{                   ////    int y = rand.Next(image.Height);             ////    g.DrawLine(blackPen,0,y,image.Width,y);             ////}               //System.IO.MemoryStream ms = new System.IO.MemoryStream();             //image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);             //Response.ClearContent();             //Response.ContentType = "image/Jpeg";             //Response.BinaryWrite(ms.ToArray());                      //g.Dispose();             //image.Dispose();               //2             //Response.Clear();             //Bitmap imgOutput = new Bitmap(iwidth, 50);                        //Graphics gic = Graphics.FromImage(imgOutput);             //gic.Clear(Color.BlueViolet);             //gic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;             //gic.DrawString(checkCode, new Font("黑体", 16, FontStyle.Italic), new SolidBrush(Color.White), new PointF(2, 2));             //gic.FillRectangle(new System.Drawing.Drawing2D.LinearGradientBrush(new Point(0, 0), new Point(100, 50), Color.FromArgb(0, 0, 0, 0),Color.FromArgb(255, 255, 255, 255)), 0, 0, 100, 50);             //imgOutput.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);             //gic.Dispose();             //imgOutput.Dispose();             //Response.End();               //3             System.Drawing.Bitmap image = CreateImageCode(checkCode);             System.IO.MemoryStream ms = new System.IO.MemoryStream();             image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);             Response.ClearContent();             Response.ContentType = "image/Jpeg";             Response.BinaryWrite(ms.ToArray());             //g.Dispose();             image.Dispose();             }           #region 产生波形滤镜效果           private const double PI = 3.1415926535897932384626433832795;         private const double PI2 = 6.283185307179586476925286766559;           /// <summary>         /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）         /// </summary>         /// <param name="srcBmp">图片路径</param>         /// <param name="bXDir">如果扭曲则选择为True</param>         /// <param name="dMultValue">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>         /// <returns></returns>         public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)         {             System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);               // 将位图背景填充为白色             System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);             graph.FillRectangle(new SolidBrush(System.Drawing.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 ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;                     dx += dPhase;                     double dy = Math.Sin(dx);                       // 取得当前点的颜色                     int nOldX = 0, nOldY = 0;                     nOldX = bXDir ? i + (int)(dy * dMultValue) : i;                     nOldY = bXDir ? j : j + (int)(dy * dMultValue);                       System.Drawing.Color color = srcBmp.GetPixel(i, j);                     if (nOldX >= 0 && nOldX < destBmp.Width                      && nOldY >= 0 && nOldY < destBmp.Height)                     {                         destBmp.SetPixel(nOldX, nOldY, color);                     }                 }             }             return destBmp;         }         #endregion           #region 生成校验码图片         /// <summary>         ///         /// </summary>         /// <param name="code"></param>         /// <returns></returns>         public Bitmap CreateImageCode(string code)         {             int fSize = FontSize;             int fWidth = fSize + Padding;               int imageWidth = (int)(code.Length * fWidth) + 30 + Padding * 2;             int imageHeight = fSize * 2 + Padding;               System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);               Graphics g = Graphics.FromImage(image);               g.Clear(BackgroundColor);               Random rand = new Random();               //给背景添加随机生成的燥点             if (this.Chaos)             {                   Pen pen = new Pen(ChaosColor, 0);                 int c = Length * 10;                   for (int i = 0; i < c; i++)                 {                     int x = rand.Next(image.Width);                     int y = rand.Next(image.Height);                       g.DrawRectangle(pen, x, y, 1, 1);                 }             }               int left = 0, top = 0, top1 = 1, top2 = 1;               int n1 = (imageHeight - FontSize - Padding * 2);             int n2 = n1 / 4;             top1 = n2;             top2 = n2 * 2;               Font f;             Brush b;               int cindex, findex;               //随机字体和颜色的验证码字符             for (int i = 0; i < code.Length; i++)             {                 cindex = rand.Next(Colors.Length - 1);                 findex = rand.Next(Fonts.Length - 1);                   f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);                 b = new System.Drawing.SolidBrush(Colors[cindex]);                   if (i % 2 == 1)                 {                     top = top2;                 }                 else                 {                     top = top1;                 }                   left = i * fWidth;                   g.DrawString(code.Substring(i, 1), f, b, left, top);             }               //画一个边框 边框颜色为Color.Gainsboro             g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);             g.Dispose();               //产生波形（Add By 51aspx.com）             image = TwistImage(image, true, 8, 4);               return image;         }         #endregion           #region 验证码长度(默认4个验证码的长度)         int length = 4;         public int Length         {             get { return length; }             set { length = value; }         }         #endregion           #region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)         int fontSize = 40;         public int FontSize         {             get { return fontSize; }             set { fontSize = value; }         }         #endregion           #region 边框补(默认1像素)         int padding = 2;         public int Padding         {             get { return padding; }             set { padding = value; }         }         #endregion           #region 是否输出燥点(默认不输出)         bool chaos = true;         public bool Chaos         {             get { return chaos; }             set { chaos = value; }         }         #endregion           #region 输出燥点的颜色(默认灰色)         Color chaosColor = Color.LightGray;         public Color ChaosColor         {             get { return chaosColor; }             set { chaosColor = value; }         }         #endregion           #region 自定义背景色(默认白色)         Color backgroundColor = Color.White;         public Color BackgroundColor         {             get { return backgroundColor; }             set { backgroundColor = value; }         }         #endregion           #region 自定义随机颜色数组         Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };         public Color[] Colors         {             get { return colors; }             set { colors = value; }         }         #endregion           #region 自定义字体数组         string[] fonts = { "Arial", "Georgia" };         public string[] Fonts         {             get { return fonts; }             set { fonts = value; }         }         #endregion           #region 自定义随机码字符串序列(使用逗号分隔)         //string codeSerial = "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,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 codeSerial = "阿,保,持,的,法,规,和,东,三,省,问,我,惹,你,诶,没,改,变,揍,屁,股,吧,涂,聚,文,中,国";         public string CodeSerial         {             get { return codeSerial; }             set { codeSerial = value; }         }         #endregion     } }

　　测试

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63

using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls;   namespace WebVerificationCode {       /// <summary>     ///     /// </summary>     public partial class _Default : System.Web.UI.Page     {           /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         protected void Page_Load(object sender, EventArgs e)         {           }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)         {             switch (DropDownList1.SelectedValue)             {                 case "1":                     Image1.ImageUrl = "codepng.aspx?code=1";                     break;                 case "2":                     Image1.ImageUrl = "codepng.aspx?code=2";                     break;                 case "3":                     Image1.ImageUrl = "codepng.aspx?code=3";                     break;             }         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         protected void Button2_Click(object sender, EventArgs e)         {             if (TextBox1.Text == Session["gif"].ToString())                 Response.Write("OK,正确");             else                 Response.Write("验证码不符合");         }     } }