RandomHelper-随机数辅助类代码,Asp.NET代码库,德仔网

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【Asp.NET】 RandomHelper-随机数辅助类
作者: / 发布于2016/7/27/ 345
namespace Framework  
{  
    using System;  
    using System.Globalization;  
    using System.Text;  
  
    /// <summary>  
    /// 随机数辅助类  
    /// </summary>  
    public sealed class RandomHelper  
    {  
        private static readonly char[] RandChar = { '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', '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' };  
        private static Random rand = new Random(unchecked((int)DateTime.Now.Ticks));  
        private static int seed = 1;  
  
        private RandomHelper()  
        {  
        }  
  
        /// <summary>  
        /// 根据规则随机生成字符串  
        /// </summary>  
        /// <param name="pattern">样式："?"代表一个字符，"#"代表一个一位数字，"*"代表一个字符串或一个一位数字</param>  
        /// <returns>随机字符串</returns>  
        public static string GetRandStringByPattern(string pattern)  
        {  
            if (!pattern.Contains("#") && !pattern.Contains("?") && !pattern.Contains("*"))  
            {  
                return pattern;  
            }  
  
            char[] nums = pattern.ToCharArray();  
            StringBuilder sb = new StringBuilder();  
            for (int i = 0; i < nums.Length; i++)  
            {  
                switch (nums[i])  
                {  
                    case '?':  
                        nums[i] = RandChar[rand.Next(10, 62)];  
                        break;  
                    case '#':  
                        nums[i] = RandChar[rand.Next(0, 10)];  
                        break;  
                    case '*':  
                        nums[i] = RandChar[rand.Next(62)];  
                        break;  
                    default:  
                        break;  
                }  
  
                sb.Append(nums[i]);  
            }  
  
            return sb.ToString();  
        }  
  
        /// <summary>  
        /// 生成随机的数值  
        /// </summary>  
        /// <param name="min">随机数可取该下界值</param>  
        /// <param name="max">随机数的上界</param>  
        /// <returns>随机的数值</returns>  
        public static int GetFormatedNumeric(int min, int max)  
        {  
            int num = 0;  
            Random ro = new Random(unchecked(seed * (int)DateTime.Now.Ticks));  
            num = ro.Next(min, max);  
            seed++;  
            return num;  
        }  
  
        /// <summary>  
        /// 获取指定长度和字符的随机字符串  
        /// 通过调用 Random 类的 Next() 方法，先获得一个大于或等于 0 而小于 pwdchars 长度的整数  
        /// 以该数作为索引值，从可用字符串中随机取字符，以指定的密码长度为循环次数  
        /// 依次连接取得的字符，最后即得到所需的随机密码串了。  
        /// </summary>  
        /// <param name="pwdchars">随机字符串里包含的字符</param>  
        /// <param name="pwdlen">随机字符串的长度</param>  
        /// <returns>随机产生的字符串</returns>  
        public static string GetRandomString(string pwdchars, int pwdlen)  
        {  
            StringBuilder tmpstr = new StringBuilder();  
            int randNum;  
  
            for (int i = 0; i < pwdlen; i++)  
            {  
                randNum = rand.Next(pwdchars.Length);  
                tmpstr.Append(pwdchars[randNum]);  
            }  
  
            return tmpstr.ToString();  
        }  
  
        /// <summary>  
        /// 获取指定长度的随机字符串  
        /// </summary>  
        /// <param name="pwdlen">随机字符串的长度</param>  
        /// <returns>随机产生的字符串</returns>  
        public static string GetRandomString(int pwdlen)  
        {  
            return GetRandomString("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_*", pwdlen);  
        }  
  
        /// <summary>  
        /// 获取指定长度的纯字母随机字符串  
        /// </summary>  
        /// <param name="pwdlen">数字串长度</param>  
        /// <returns>纯字母随机字符串</returns>  
        public static string GetRandWord(int pwdlen)  
        {  
            return GetRandomString("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", pwdlen);  
        }  
  
        /// <summary>  
        /// 获取指定长度的纯数字随机数字串  
        /// </summary>  
        /// <param name="intlong">数字串长度</param>  
        /// <returns>纯数字随机数字串</returns>  
        public static string GetRandomNum(int intlong)  
        {  
            StringBuilder w = new StringBuilder(string.Empty);  
  
            for (int i = 0; i < intlong; i++)  
            {  
                w.Append(rand.Next(10));  
            }  
  
            return w.ToString();  
        }  
  
        /// <summary>  
        /// 获取按照年月时分秒随机数生成的文件名  
        /// </summary>  
        /// <returns>随机文件名</returns>  
        public static string GetFileRndName()  
        {  
            return DateTime.Now.ToString("yyyyMMddHHmmss", CultureInfo.CurrentCulture) + GetRandomString("0123456789", 4);  
        }  
    }  
}
试试其它关键字
　RandomHelper　　随机数　
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