C#生成随机数功能示例

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;
namespacecsharp
{
  classProgram
  {
    staticvoidMain(string[] args)
    {
      Console.WriteLine("生成随机数n");
      intrandCount = 9;//随机数发的个数
      intrandMin = 1;//随机数最小值
      intrandMax = 21;//随机数最大值
      intrandIndex, flag, temp;
      randIndex = temp = flag = 0;
      Random rand =newRandom();
      int[] randArr =newint[randCount];
      randArr[0] = rand.Next(randMin, randMax);
      while(true)
      {
        flag = 0;
        temp = rand.Next(randMin, randMax);
        for(inti = 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;
        }
        elseif(flag == 0)
        {
          randIndex++;
          randArr[randIndex] = temp;
        }
        if(randIndex >= randCount - 1)//如果达到 randCount 退出循环
        {
          break;
        }
      }
      for(inti = 0; i < randCount; i++)
      {
        Console.WriteLine("arr["+ i +"]="+ randArr[i]);
      }
      Console.WriteLine("n任意键退出。");
      Console.ReadLine();
    }
  }
}