YZMHelper.cs

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using System;
using System.Web;
using System.Drawing;
using System.Security.Cryptography;

/// <summary>
/// 验证码类
/// </summary>
public class Rand
{
    #region 生成随机数字
    /// <summary>
    /// 生成随机数字
    /// </summary>
    /// <param name="length">生成长度</param>
    public static string Number(int Length)
    {
        return Number(Length, false);
    }

    /// <summary>
    /// 生成随机数字
    /// </summary>
    /// <param name="Length">生成长度</param>
    /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
    public static string Number(int Length, bool Sleep)
    {
        if (Sleep) System.Threading.Thread.Sleep(3);
        string result = "";
        System.Random random = new Random();
        for (int i = 0; i < Length; i++)
        {
            result += random.Next(10).ToString();
        }
        return result;
    }
    #endregion
   
    #region 生成随机字母与数字
    /// <summary>
    /// 生成随机字母与数字
    /// </summary>
    /// <param name="IntStr">生成长度</param>
    public static string Str(int Length)
    {
        return Str(Length, false);
    }

    /// <summary>
    /// 生成随机字母与数字
    /// </summary>
    /// <param name="Length">生成长度</param>
    /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
    public static string Str(int Length, bool Sleep)
    {
        if (Sleep) System.Threading.Thread.Sleep(3);
        char[] Pattern = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
        string result = "";
        int n = Pattern.Length;
        System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));