一例c#生成驗證碼的代碼。

代碼:

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;public partial class inc_ValidCode : System.Web.UI.Page{ PRotected void Page_Load(object sender, EventArgs e) { VerifyCode v = new VerifyCode(); v.Length = 4; v.FontSize = 14; v.Chaos = true; v.BackgroundColor = Color.White; v.ChaosColor = Color.LightGray; //v.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"; //v.Colors = this.colors;`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````` //v.Fonts = this.fonts; v.Padding = 2; string code = v.CreateVerifyCode(); //取隨機碼 v.CreateImageOnPage(code, this.Context); // 輸出圖片 //Response.Cookies.Add(new HttpCookie("fcvalidtcode", code.ToUpper()));// 使用Cookies取驗證碼的值 session["bao_code"] = code.ToUpper(); } public class VerifyCode { #region 驗證碼長度(默認6個驗證碼的長度)#region 驗證碼長度(默認6個驗證碼的長度) int length = 6; public int Length { get { return length; } set { length = value; } } #endregion #region 驗證碼字體大小(為了顯示扭曲效果，默認40像素，可以自行修改)#region 驗證碼字體大小(為了顯示扭曲效果，默認40像素，可以自行修改) int fontSize = 30; public int FontSize { get { return fontSize; } set { fontSize = value; } } #endregion #region 邊框補(默認1像素)#region 邊框補(默認1像素) int padding = 2; public int Padding { get { return padding; } set { padding = value; } } #endregion #region 是否輸出燥點(默認不輸出)#region 是否輸出燥點(默認不輸出) bool chaos = true; public bool Chaos { get { return chaos; } set { chaos = value; } } #endregion #region 輸出燥點的顏色(默認灰色)#region 輸出燥點的顏色(默認灰色) Color chaosColor = Color.LightGray; public Color ChaosColor { get { return chaosColor; } set { chaosColor = value; } } #endregion #region 自定義背景色(默認白色)#region 自定義背景色(默認白色) Color backgroundColor = Color.White; public Color BackgroundColor { get { return backgroundColor; } set { backgroundColor = value; } } #endregion #region 自定義隨機顏色數組#region 自定義隨機顏色數組 Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; public Color[] Colors { www.jbxue.com get { return colors; } set { colors = value; } } #endregion #region 自定義字體數組#region 自定義字體數組 string[] fonts = { "Arial", "Georgia" }; public string[] Fonts { get { return fonts; } set { fonts = value; } } #endregion #region 自定義隨機碼字符串序列(使用逗號分隔)#region 自定義隨機碼字符串序列(使用逗號分隔) 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"; public string CodeSerial { get { return codeSerial; } set { codeSerial = value; } } #endregion #region 產生波形濾鏡效果#region 產生波形濾鏡效果 private const double PI = 3.1415926535897932384626433832795; private const double PI2 = 6.283185307179586476925286766559; /**/ /// <summary> /// 正弦曲線Wave扭曲圖片（Edit By 51aspx.com） /// </summary> /// <param name="srcBmp">圖片路徑</param> /// <param name="bXDir">如果扭曲則選擇為True</param> /// <param name="nMultValue">波形的幅度倍數，越大扭曲的程度越高，一般為3</param> /// <param name="dPhase">波形的起始相位，取值區間[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); // 將位圖背景填充為白色 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++) { // www.jbxue.com double dx = 0; dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen; dx += dPhase; double dy = Math.Sin(dx); // 取得當前點的顏色 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 生成校驗碼圖片#region 生成校驗碼圖片 public Bitmap CreateImageCode(string code) { int fSize = FontSize; int fWidth = fSize + Padding; int imageWidth = (int)(code.Length * fWidth) + 4 + 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(); //給背景添加隨機生成的燥點 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; //隨機字體和顏色的驗證碼字符 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); } //畫一個邊框 邊框顏色為Color.Gainsboro g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1); g.Dispose(); //產生波形（Add By 51aspx.com） image = TwistImage(image, true, 0, 4); return image; } #endregion #region 將創建好的圖片輸出到頁面#region 將創建好的圖片輸出到頁面 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); conte