1using System;
  2using System.Data;
  3using System.Configuration;
  4using System.Web;
  5using System.Web.Security;
  6using System.Web.UI;
  7using System.Web.UI.WebControls;
  8using System.Web.UI.WebControls.WebParts;
  9using System.Web.UI.HtmlControls;
 10using System.Text;
 11/**//// <summary>
 12/// fun 的摘要说明
 13/// </summary>
 14//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)
 15
 16public class fun
 17...{
 18    public fun()
 19    ...{
 20        //
 21        // TODO: 在此处添加构造函数逻辑
 22        //
 23    }
 24    public static string Left(string sSource, int iLength)
 25    ...{
 26        return sSource.Substring(0, iLength > sSource.Length ? sSource.Length : iLength);
 27    }
 28    /**//// <summary>
 29    /// encrypting string
 30    /// </summary>
 31    /// <param name="Password">encrypting string</param>
 32    /// <param name="Format">format,0 is SHA1,1 is MD5</param>
 33    /// <returns></returns>
 34    public static string Encrypt(string Password, int Format)
 35    ...{
 36        string str = "";
 37        switch (Format)
 38        ...{
 39            case 0:
 40                str = FormsAuthentication.HashPasswordForStoringInConfigFile(Password, "SHA1");
 41                break;
 42            case 1:
 43                str = FormsAuthentication.HashPasswordForStoringInConfigFile(Password, "MD5");
 44                break;
 45        }
 46        return str;
 47    }
 48    public static string GenerateMix(int CodeLength)
 49    ...{
 50        int number;
 51        StringBuilder result = new StringBuilder();
 52
 53        System.Random random = new Random();
 54
 55        for (int i = 0; i < CodeLength; i++)
 56        ...{
 57            number = random.Next();
 58
 59            if (number % 2 == 0)
 60                result.Append(((char)('0' + (char)(number % 10))).ToString());
 61            else
 62                result.Append(((char)('A' + (char)(number % 26))).ToString());
 63
 64        }
 65        return result.ToString();
 66    }
 67    public string GenerateMixNo(int CodeLength)
 68    ...{
 69        int number;
 70        StringBuilder result = new StringBuilder();
 71
 72        System.Random random = new Random();
 73
 74        for (int i = 0; i < CodeLength; i++)
 75        ...{
 76            number = random.Next();
 77            if ((i+1) % 6 == 0 && i!=0 && i!=CodeLength)
 78                result.Append("-");
 79            else
 80            result.Append(((char)('0' + (char)(number % 10))).ToString());
 81        }
 82        return result.ToString();
 83    }
 84
 85    public static string CreateValidateNumber(int length)
 86    ...{
 87        int[] randMembers = new int[length];
 88        int[] validateNums = new int[length];
 89        string validateNumberStr = "";
 90        //生成起始序列值
 91        int seekSeek = unchecked((int)DateTime.Now.Ticks);
 92        Random seekRand = new Random(seekSeek);
 93        int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
 94        int[] seeks = new int[length];
 95        for (int i = 0; i < length; i++)
 96        ...{
 97            beginSeek += 10000;
 98            seeks[i] = beginSeek;
 99        }
100        //生成随机数字
101        for (int i = 0; i < length; i++)
102        ...{
103            Random rand = new Random(seeks[i]);
104            int pownum = 1 * (int)Math.Pow(10, length);
105            randMembers[i] = rand.Next(pownum, Int32.MaxValue);
106        }
107        //抽取随机数字
108        for (int i = 0; i < length; i++)
109        ...{
110            string numStr = randMembers[i].ToString();
111            int numLength = numStr.Length;
112            Random rand = new Random();
113            int numPosition = rand.Next(0, numLength - 1);
114            validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
115        }
116        //生成验证码
117        for (int i = 0; i < length; i++)
118        ...{
119            validateNumberStr += validateNums[i].ToString();
120        }
121        return validateNumberStr;
122    }
123
124}
125