C#生成不重复随机字符串类

本文实例讲述了C#生成不重复随机字符串类。分享给大家供大家参考。具体如下：

这个C#类用于随机产生不重复的字符串，可以指定字符串范围，可以指定要产生字符串的长度

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
    /// 

    /// 从字符串里随机得到，规定个数的字符串.
    /// 
    /// 
    /// 
    /// 
    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
  }
}

希望本文所述对大家的C#程序设计有所帮助。