C#随机数不生成0

Question

我正在使用 C# 控制台应用程序开发足球联赛赛程项目。我正在尝试从包含在主场和客场比赛的球队的阵列中选择随机球队。当我尝试生成 9 个随机数时，只生成了 8 个数字而没有生成 0 个，因此代码无法中断 for 循环。我想问题是 if 语句不允许生成相同的数字，并且 int 数组的元素的默认值为 0。

这是代码和输出:

C# Code Output

    int randomHome; //Random number genetator for choosing a random iteration value from home array which containss the teams which plays at their home
    int randomAway; //Random number genetator for choosing a random iteration value from awayarray which containss the teams which plays at away

      Random randomNum = new Random();

      int[] randomHomeNumArray = new int[home.Length]; //array will hold the randomHome values and home array is the array which is holding the team's iteration values which plays at their home
      int[] randomAwayNumArray = new int[away.Length]; //array will hold the randomAway values and away array is the array which is holding the team's iteration values which plays at away
         for (int homeArrayCounter = 0; homeArrayCounter < randomHomeNumArray.Length; homeArrayCounter++)
        {
            randomHome = randomNum.Next(home.Length)

            if (!randomHomeNumArray.Contains(randomHome) )
            {
                randomHomeNumArray[homeArrayCounter] = randomHome;   //It will hold the randomHome values
                Console.WriteLine(homeArrayCounter + ". iterasyon in Home " + randomHomeNumArray[homeArrayCounter]);
            }
            else
            {
                homeArrayCounter--;
            }
        }
        Console.WriteLine("\n\n");


        for (int awayArrayCounter = 0; awayArrayCounter < randomAwayNumArray.Length; awayArrayCounter++)
        {
            randomAway = randomNum.Next(randomAwayNumArray.Length);    

            if (!randomAwayNumArray.Contains(randomAway))
            {
                randomAwayNumArray[awayArrayCounter] = randomAway;     //It holds the random valures from away array which contains the teams which plays at away
                Console.WriteLine(awayArrayCounter + ". iterasyon in Away " + randomAwayNumArray[awayArrayCounter]);
            }

            else
            {
                awayArrayCounter--;
            }
        }

Answer 1

当你初始化一个数组时，默认情况下它的每个索引的值为 0。当您使用随机数时，它总是会跳过 0，因为它已经存在。

你可以这样尝试:-

for(int i= 0; i<randomHomeNumArray.Length; i++){
            randomHomeNumArray[i] = -1;
        }

        for (int homeArrayCounter = 0; homeArrayCounter < randomHomeNumArray.Length; homeArrayCounter++)
        {
            do{
                randomHome = randomNum.Next(home.Length);
            } while(!randomHomeNumArray.Contains(randomHome));
            randomHomeNumArray[homeArrayCounter] = randomHome;   //It will hold the randomHome values
            Console.WriteLine(homeArrayCounter + ". iterasyon in Home " + randomHomeNumArray[homeArrayCounter]);
        }