C#生成随机数,支持多种方式[类]

using System;using System.Text;using System.Collections.Generic;namespace Pub.Class{    /// <summary>    /// 生成随机数类    /// </summary>    public class Rand    {        /// <summary>        /// 随机系数        /// </summary>        public static int _RandIndex = 0;        #region RndInt        /// <summary>        /// 数字随机数        /// </summary>        /// <param name="num1">开始</param>        /// <param name="num2">结束</param>        /// <returns>从多少到多少之间的数据 包括开始不包括结束</returns>        public static int RndInt(int num1,int num2) {            if (_RandIndex >= 1000000) _RandIndex = 1;            Random rnd = new Random(DateTime.Now.Millisecond + _RandIndex);            _RandIndex++;            return rnd.Next(num1, num2);        }        public static IList<int> RndInt(int num1,int num2, int len) {            IList<int> list = new List<int>();            for (int i = 0; i < len; i++) list.Add(RndInt(num1, num2));            return list;        }        public static IList<int> RndInt(int len) {            IList<int> list = RndInt(0, int.MaxValue, len);            return list;        }        #endregion        #region RndNum        /// <summary>        /// 数字随机数        /// </summary>        /// <param name="length">生成长度</param>        /// <returns>返回指定长度的数字随机串</returns>        public static string RndNum(int length)        {            if (_RandIndex >= 1000000) _RandIndex = 1;            char[] arrChar = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };            StringBuilder num = new StringBuilder();            Random rnd = new Random(DateTime.Now.Millisecond + _RandIndex);            for (int i = 0; i < length; i++) {                num.Append(arrChar[rnd.Next(0, 9)].ToString());            }            return num.ToString();        }        #endregion        #region RndDateStr        /// <summary>        /// 日期随机函数        /// </summary>        /// <returns>返回日期随机串</returns>        public static string RndDateStr()        {            return DateTime.Now.ToString("yyyyMMddHHmmssfff") + Rand.RndInt(1000, 9999).ToString();        }        public static IList<string> RndDateStr(int len) {            IList<string> list = new List<string>();            for (int i = 0; i < len; i++) list.Add(RndDateStr());            return list;        }        #endregion        #region RndCode        /// <summary>        /// 数字和字母随机数        /// </summary>        /// <param name="length">生成长度</param>        /// <returns>返回指定长度的数字和字母的随机串</returns>        public static string RndCode(int length)        {            if (_RandIndex >= 1000000) _RandIndex = 1;            char[] arrChar = new char[]{               'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x',               '0','1','2','3','4','5','6','7','8','9',               'A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z'};            System.Text.StringBuilder num = new System.Text.StringBuilder();            Random rnd = new Random(DateTime.Now.Millisecond + _RandIndex);            for (int i = 0; i < length; i++) {                num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString());            }            return num.ToString();        }        public static IList<string> RndCodeList(int len) {            IList<string> list = new List<string>();            for (int i = 0; i < len; i++) list.Add(RndCode(len));            return list;        }        #endregion        #region RndLetter        /// <summary>        /// 字母随机数        /// </summary>        /// <param name="length">生成长度</param>        /// <returns>返回指定长度的字母随机数</returns>        public static string RndLetter(int length) {            if (_RandIndex >= 1000000) _RandIndex = 1;            char[] arrChar = new char[]{                'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x',                '_',                'A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z'};            StringBuilder num = new StringBuilder();            Random rnd = new Random(DateTime.Now.Millisecond + _RandIndex);            for (int i = 0; i < length; i++) {                num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString());            }            return num.ToString();        }        public static IList<string> RndLetterList(int len) {            IList<string> list = new List<string>();            for (int i = 0; i < len; i++) list.Add(RndLetter(len));            return list;        }        #endregion        #region GetGuid        /// <summary>        /// 生成GUID        /// </summary>        /// <returns></returns>        public static string GetGuid()        {            System.Guid g = System.Guid.NewGuid();            return g.ToString();        }        public static IList<string> GetGuid(int len) {            IList<string> list = new List<string>();            for (int i = 0; i < len; i++) list.Add(GetGuid());            return list;        }        #endregion    }}