App_Code/Common/fun.cs

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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;
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);
    }
    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();