很棒的验证码（可以任意设置相关属性）（汉字，英文，数字等）

using System;


using System.Collections;


using System.Configuration;


using System.Data;


using System.Web;


using System.Web.Security;


using System.Web.UI;


using System.Web.UI.HtmlControls;


using System.Web.UI.WebControls;


using System.Web.UI.WebControls.WebParts;


using System.Text;


using System.Drawing;




namespace VerifyColorCode






{


public partial class VerifyCode : System.Web.UI.Page






{


public Encoding GB = Encoding.GetEncoding("GB2312");


protected void Page_Load(object sender, EventArgs e)






{




VerifyCode v = new VerifyCode();




v.Length = this.length;


v.FontSize = this.fontSize;


v.Chaos = this.chaos;


v.BackgroundColor = this.backgroundColor;


v.ChaosColor = this.chaosColor;


v.CodeSerial = this.codeSerial;


v.Colors = this.colors;


v.Fonts = this.fonts;


v.Padding = this.padding;


string code = v.CreateVerifyCode(); //取随机码


v.CreateImageOnPage(code, this.Context); // 输出图片


Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper()));// 使用Cookies取验证码的值




}






验证码长度(默认6个验证码的长度)#region 验证码长度(默认6个验证码的长度)


int length = 6;


public int Length






{




get

{ return length; }




set

{ length = value; }


}


#endregion






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)#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 = 12;


public int FontSize






{




get

{ return fontSize; }




set

{ fontSize = value; }


}


#endregion






边框补(默认1像素)#region 边框补(默认1像素)


int padding = 1;


public int Padding






{




get

{ return padding; }




set

{ padding = value; }


}


#endregion






是否输出燥点(默认不输出)#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






输出燥点的颜色(默认灰色)#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






自定义背景色(默认白色)#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






自定义随机颜色数组#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






自定义字体数组#region 自定义字体数组




string[] fonts =

{ "Arial", "Georgia" };


public string[] Fonts






{




get

{ return fonts; }




set

{ fonts = value; }


}


#endregion






自定义随机码字符串序列(使用逗号分隔)#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 = "殃,央,鸯,秧,杨,扬,佯,疡,羊,洋,阳,氧,仰,痒,养,样,漾,邀,腰,妖,瑶,摇,尧,遥,窑,谣,姚,咬,舀,药,要,耀,椰,噎,耶,爷,野,冶,也,页,掖,业,叶,曳,腋,夜,液,一,壹,医,揖,铱,依,伊,衣,颐,夷,遗,移,仪,胰,疑,沂,宜,姨,彝,椅,蚁,倚,已,乙,矣,以,艺,抑,易,邑,屹,亿,役,臆,逸,肄,疫,亦,裔,意,毅,忆,义,益,溢,诣,议,谊,译,异,翼,翌,绎,茵,荫,因,殷,音,阴,姻,吟,银,淫,寅,饮,尹,引,隐,印,英,樱,婴,鹰,应,缨,莹,萤,营,荧,蝇,迎,赢,盈,影,颖,硬,映,哟,拥,佣,臃,痈,庸,雍,踊,蛹,咏,泳,涌,永,恿,勇,用,幽,优,悠,忧,尤,由,邮,铀,犹,油,游,酉,有,友,右,佑,釉,诱,又,幼,迂,淤,于,盂,榆,虞,愚,舆,余,俞,逾,鱼,愉,渝,渔,隅,予,娱,雨,与,屿,禹,株,蛛,朱,猪,诸,诛,逐,竹,烛,煮,拄,瞩,嘱,主,著,柱,助,蛀,贮,铸,筑,住,注,祝,驻,抓,爪,拽,专,砖,转,撰,赚,篆,桩,庄,装,妆,撞,壮,状,椎,锥,追,赘,坠,缀,谆,准,捉,拙,卓,桌,琢,茁,酌,啄,着,灼,浊,兹,咨,资,姿,滋,淄,孜,紫,仔,籽,滓,子,自,渍,字,鬃,棕,踪,宗,综,总,纵,邹,走,奏,揍,租,足,卒,族,祖,诅,阻,组,钻,纂,嘴,醉,最,罪,尊,遵,昨,左,佐,柞,做,作,坐,座";


public string CodeSerial






{




get

{ return codeSerial; }




set

{ codeSerial = value; }


}


#endregion






产生波形滤镜效果#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="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>


/// <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






生成校验码图片#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) + 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();




//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






将创建好的图片输出到页面#region 将创建好的图片输出到页面


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);




context.Response.ClearContent();


context.Response.ContentType = "image/Jpeg";


context.Response.BinaryWrite(ms.GetBuffer());




ms.Close();


ms = null;


image.Dispose();


image = null;


}


#endregion






生成随机字符码#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






}


}

前台页面：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="VerifyCode.aspx.cs" Inherits="VerifyColorCode.VerifyCode" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>验证码</title>
</head>
<body>
<form id="form1" runat="server">
<div>

</div>
</form>
</body>
</html>

调用方法：
<img id="imgVerify" src="VerifyCode.aspx?" alt="看不清？点击更换" onclick="this.src=this.src+'?'" />

后台方法：

if (Request.Cookies["CheckCode"] == null)
{
Alert(this, "您的浏览器设置已被禁用 Cookies，您必须设置浏览器允许使用 Cookies 选项后才能使用本系统。");
return;
}

if (String.Compare(Request.Cookies["CheckCode"].Value, txtV.Text.ToString().Trim(), true) != 0)
{
Alert(this,"验证码错误！");
return;
}