Detailed code example of C# generating random number function

This article mainly introduces the function of generating random numbers in C#, involving techniques related to C# mathematical operations and string operations. It has certain reference value. Friends who need it can refer to it.

The example in this article describes the function of generating random numbers in C#. Share it with everyone for your reference, the details are as follows:

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();
    }
  }
}

Generate random numbers without duplication

The running results are as follows:

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