C#的随机类封装RandomHelper

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

namespace Utility.Helper

{

    public static class RandomHelper

    {

        /// <summary>

        /// 取随机数

        /// </summary>

        /// <param name="length"></param>

        /// <returns></returns>

        public static string BuildRandomStr(int length)

        {

            Random rand = new Random();

 

            int num = rand.Next();

 

            string str = num.ToString();

 

            if (str.Length > length)

            {

                str = str.Substring(0, length);

            }

            else if (str.Length < length)

            {

                int n = length - str.Length;

                while (n > 0)

                {

                    str.Insert(0, "0");

                    n--;

                }

            }

            return str;

        }

        /// <summary>

        /// Guid唯一标识

        /// </summary>

        /// <returns></returns>

        public static string GetUUID() {

            string _guid = Guid.NewGuid().ToString();

            return _guid.Replace("-","").ToString();

        }

 

        /// <summary>

        /// 取时间戳生成随即数,替换交易单号中的后10位流水号

        /// </summary>

        /// <returns></returns>

        public static UInt32 UnixStamp()

        {

            TimeSpan ts = DateTime.Now - TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));

            return Convert.ToUInt32(ts.TotalSeconds);

        }

 

        /// <summary>

        /// 产生随机数字字符串

        /// </summary>

        /// <returns></returns>

        public static string RandomStr(int Num)

        {

            int number;

            char code;

            string returnCode = String.Empty;

 

            Random random = new Random();

 

            for (int i = 0; i < Num; i++)

            {

                number = random.Next();

                code = (char)('0' + (char)(number % 10));

                returnCode += code.ToString();

            }

            return returnCode;

        }

        

        /// <summary>

        /// 生成随机数字字符串

        /// </summary>

        /// <param name="int_NumberLength">数字长度</param>

        /// <returns></returns>

        public static string GetRandomNumberString(int int_NumberLength)

        {

            return GetRandomNumberString(int_NumberLength, false);

        }

        /// <summary>

        /// 生成随机数字字符串

        /// </summary>

        /// <param name="int_NumberLength">数字长度</param>

        /// <returns></returns>

        public static string GetRandomNumberString(int int_NumberLength, bool onlyNumber)

        {

            Random random = new Random();

            return GetRandomNumberString(int_NumberLength, onlyNumber, random);

        }

        /// <summary>

        /// 生成随机数字字符串

        /// </summary>

        /// <param name="int_NumberLength">数字长度</param>

        /// <returns></returns>

        public static string GetRandomNumberString(int int_NumberLength, bool onlyNumber, Random random)

        {

            string strings = "123456789";

            if (!onlyNumber) strings += "abcdefghjkmnpqrstuvwxyz";

            char[] chars = strings.ToCharArray();

            string returnCode = string.Empty;

            for (int i = 0; i < int_NumberLength; i++)

                returnCode += chars[random.Next(0, chars.Length)].ToString();

            return returnCode;

        }

        /// <summary>

        /// 生成产品订单号，全站统一格式

        /// </summary>

        /// <returns></returns>

        public static string GetProductOrderNum()

        {

            return DateTime.Now.ToString("yyyyMMddHHmmss") + GetRandomNumberString(4, true);

        }

    }

}