- using System;
- namespace DotNet.Utilities
- {
- public class RandomOperate
- {
- // 一:随机生成不重复数字字符串
- private int rep = 0;
- public string GenerateCheckCodeNum(int codeCount)
- {
- string str = string.Empty;
- long num2 = DateTime.Now.Ticks + this.rep;
- this.rep++;
- Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> this.rep)));
- for (int i = 0; i < codeCount; i++)
- {
- int num = random.Next();
- str = str + ((char)(0x30 + ((ushort)(num % 10)))).ToString();
- }
- return str;
- }
- //方法二:随机生成字符串(数字和字母混和)
- public string GenerateCheckCode(int codeCount)
- {
- string str = string.Empty;
- long num2 = DateTime.Now.Ticks + this.rep;
- this.rep++;
- Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> this.rep)));
- for (int i = 0; i < codeCount; i++)
- {
- char ch;
- int num = random.Next();
- if ((num % 2) == 0)
- {
- ch = (char)(0x30 + ((ushort)(num % 10)));
- }
- else
- {
- ch = (char)(0x41 + ((ushort)(num % 0x1a)));
- }
- str = str + ch.ToString();
- }
- return str;
- }
- #region
- /// <summary>
- /// 从字符串里随机得到,规定个数的字符串.
- /// </summary>
- /// <param name="allChar"></param>
- /// <param name="CodeCount"></param>
- /// <returns></returns>
- private string GetRandomCode(string allChar, int CodeCount)
- {
- //string allChar = "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[] allCharArray = allChar.Split(',');
- string RandomCode = "";
- int temp = -1;
- Random rand = new Random();
- for (int i = 0; i < CodeCount; i++)
- {
- if (temp != -1)
- {
- rand = new Random(temp * i * ((int)DateTime.Now.Ticks));
- }
- int t = rand.Next(allCharArray.Length - 1);
- while (temp == t)
- {
- t = rand.Next(allCharArray.Length - 1);
- }
- temp = t;
- RandomCode += allCharArray[t];
- }
- return RandomCode;
- }
- #endregion
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/290920136193.html
来源: http://www.codesnippet.cn/detail/290920136193.html