C#生成随机数功能示例

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace csharp{  class Program  {    static void Main(string[] args)    {      Console.WriteLine("生成随机数/n");      int randCount = 9;//随机数发的个数      int randMin = 1;//随机数最小值      int randMax = 21;//随机数最大值      int randIndex, flag, temp;      randIndex = temp = flag = 0;      Random rand = new Random();      int[] randArr = new int[randCount];      randArr[0] = rand.Next(randMin, randMax);      while (true)      {        flag = 0;        temp = rand.Next(randMin, randMax);        for (int i = 0; i <= randIndex; i++)        {          if (temp == randArr[i])          {            flag = 1;            break;          }        }        if (flag == 1)//如果 flag == 1 则有重复的数字生成。        {          continue;        }        else if (flag == 0)        {          randIndex++;          randArr[randIndex] = temp;        }        if (randIndex >= randCount - 1)//如果达到 randCount 退出循环        {          break;        }      }      for (int i = 0; i < randCount; i++)      {        Console.WriteLine("arr[" + i + "]=" + randArr[i]);      }      Console.WriteLine("/n任意键退出。");      Console.ReadLine();    }  }}