c# 编程 简单实现11个数中选择不重复出现的5个数。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        Random random = new Random();
        public int[] ballNumber = new int[5];
        public bool sign = false;
        static void Main(string[] args)
        {
            new Program().shuangSeQiu();
            Console.ReadKey();
        }

        #region shuang se qiu
        public void shuangSeQiu()
        {
            for (int i = 0; i < 5; i++)
            {
                sign = false;
                Console.WriteLine("the current count number is " + i);
                int randomNumber = random.Next(1, 12);
                Console.WriteLine("output: " + randomNumber);
                if (i == 0)
                {
                    ballNumber[0] = randomNumber;
                }
                else
                {
                    for (int j = 0; j < i; j++)
                    {
                        if (randomNumber == ballNumber[j])
                        {
                            sign = true;
                            i--;
                            break;
                        }
                    }
                    if (!sign)
                    {
                        ballNumber[i] = randomNumber;
                    }
                }
            }
            for (int i = 0; i < 5; i++)
            {
                Console.WriteLine(ballNumber[i]);
            }
        }
        #endregion
    }
}