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- using System;
- using System.Collections.Generic;
- using System.Text;
- namespace PublicLibrary.Common
- {
- public class RandHelper
- {
- /// <summary>
- /// 获得三位的随机数
- /// </summary>
- /// <returns></returns>
- public static string getThreeNumRandom()
- {
- Random ro = new Random();
- int iResult;
- int iUp = 999;
- int iDown = 100;
- iResult = ro.Next(iDown, iUp);
- //Response.Write(iResult.ToString());
- return iResult.ToString().Trim();
- }
- /// <summary>
- /// 新的日期字符串
- /// </summary>
- /// <param name="oldShortDateTime"></param>
- /// <returns></returns>
- public static string generateNewLongDateTime()
- {
- string currentTime = DateTime.Now.ToString("yyyyMMddHHmmss");
- return currentTime;
- }
- /*无重复的ID生成可由上述二个函数来生成:
- 既可以生成由当前日期生成的ID,也可以由以前日期来生成这样的ID
- string newid = generateNewLongDateTime() + getTreeNumRandom();
- NewDateAndTime.ToString("yyyyMMddhhmmss"); 这一句有问题,如果是下午12点以后,就会产生13-12,14-12的情况,不是按24小时制来完成的。
- NewDateAndTime.ToString("yyyyMMddHHmmss");
- ToString("yyyyMMddhhmmss"); 12时制
- 要改成ToString("yyyyMMddHHmmss"); 24时制*/
- public static long GetTimeRandId()
- {
- string newid = generateNewLongDateTime() + getThreeNumRandom();
- return Int64.Parse(newid);
- }
- public static string GetRandGuid(int length)
- {
- string newid = Guid.NewGuid().ToString("N");
- newid = newid.Substring(0, length);
- return newid;
- }
- private static char[] constant =
- {
- '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'
- };
- public static string GenerateRandomCode(int Length)
- {
- System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62);
- Random rd = new Random();
- for (int i = 0; i < Length; i++)
- {
- newRandom.Append(constant[rd.Next(62)]);
- }
- return newRandom.ToString();
- }
- }
- }
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