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using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web.UI;
using System.Drawing.Drawing2D;
using System.IO;
namespace Validate
{
/// <summary>
/// 生成验证码的类
/// </summary>
public class ValidateNumber
{
public ValidateNumber()
{
}
/// <summary>
/// 验证码的最大长度
/// </summary>
public int MaxLength
{
get{return 10;}
}
/// <summary>
/// 验证码的最小长度
/// </summary>
public int MinLength
{
get{return 1;}
}
/// <summary>
/// 生成验证码
/// </summary>
/// <param name="length">指定验证码的长度</param>
/// <returns></returns>
public string CreateValidateNumber(int length)
{
int randMembers=new int[length];
int validateNums=new int[length];
string validateNumberStr="";
//生成起始序列值
int seekSeek=unchecked((int)DateTime.Now.Ticks);
Random seekRand=new Random(seekSeek);
int beginSeek=(int)seekRand.Next(0,Int32.MaxValue-length*10000);
int seeks=new int[length];
for(int i=0;i<length;i++)
{
beginSeek+=10000;
seeks[i]=beginSeek;
}
//生成随机数字
for(int i=0;i<length;i++)
{
Random rand=new Random(seeks[i]);
int pownum=1*(int)Math.Pow(10,length);
randMembers[i]=rand.Next(pownum,Int32.MaxValue);
}
//抽取随机数字
for(int i=0;i<length;i++)
{
string numStr=randMembers[i].ToString();
int numLength=numStr.Length;
Random rand=new Random();
int numPosition=rand.Next(0,numLength-1);
validateNums[i]=Int32.Parse(numStr.Substring(numPosition,1));
}
//生成验证码
for(int i=0;i<length;i++)
{
validateNumberStr+=validateNums[i].ToString();
}
return validateNumberStr;
}
/// <summary>
/// 创建验证码的图片
/// </summary>
/// <param name="containsPage">要输出到的page对象</param>
/// &
