App_Code/Common/ValidateNumber.cs

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using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web.UI;
using System.Drawing.Drawing2D;
using System.IO;

/// <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();