fun.cs

using System;
using System.Data;
using System.Configuration;
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.Text;
///

/// fun 的摘要说明
///

public class fun
{
public fun()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static string Left(string sSource, int iLength)
{
return sSource.Substring(0, iLength > sSource.Length ? sSource.Length : iLength);
}
///

/// encrypting string
///

/// encrypting string
/// format,0 is SHA1,1 is MD5
///
public static string Encrypt(string Password, int Format)
{
string str = "";
switch (Format)
{
case 0:
str = FormsAuthentication.HashPasswordForStoringInConfigFile(Password, "SHA1");
break;
case 1:
str = FormsAuthentication.HashPasswordForStoringInConfigFile(Password, "MD5");
break;
}
return str;
}
public static string GenerateMix(int CodeLength)
{
int number;
StringBuilder result = new StringBuilder();

System.Random random = new Random();

for (int i = 0; i < CodeLength; i++)
{
number = random.Next();

if (number % 2 == 0)
result.Append(((char)('0' + (char)(number % 10))).ToString());
else
result.Append(((char)('A' + (char)(number % 26))).ToString());

}
return result.ToString();
}
public string GenerateMixNo(int CodeLength)
{
int number;
StringBuilder result = new StringBuilder();

System.Random random = new Random();

for (int i = 0; i < CodeLength; i++)
{
number = random.Next();
if ((i+1) % 6 == 0 && i!=0 && i!=CodeLength)
result.Append("-");
else
result.Append(((char)('0' + (char)(number % 10))).ToString());
}
return result.ToString();
}

public static 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;
}

}