C#控制台仅显示第一行内容 其余数组无法正常输出问题求助

问题原因 #

代码存在赋值对象错误的问题：当选中第2个数组（A2）和第3个数组（A3）时，仍然把生成的随机字母写入了第一个数组A1，对应的A2、A3数组从未被赋值，始终是默认null值，因此打印时没有任何内容输出。

修正后代码 #

string[] A1 = new string[15];
string[] A2 = new string[15];
string[] A3 = new string[15];
Random rastgele = new Random();
int selected_array = 0;
int gamecount_for_a1 = 0;
int gamecount_for_a2=0;
int gamecount_for_a3=0;
string which_letter_str;

while (true)
{
    int which_array = rastgele.Next(3);
    if (which_array == 0)
    {
        selected_array = 0;//A1
    }
    else if (which_array == 1)
    {
        selected_array = 1;//A2
    }
    else
    {
        selected_array = 2;//A3
    }

    int which_letter_int= rastgele.Next(3);
    if  (which_letter_int == 0)
    {
        which_letter_str = "D";
    }
    else if (which_letter_int == 1)
    {
        which_letter_str = "E";
    }
    else 
    {
        which_letter_str = "U";
    }

    if (selected_array ==0)
    {
        A1[gamecount_for_a1] = which_letter_str;
        Console.SetCursorPosition(gamecount_for_a1, 0);
        Console.Write(A1[gamecount_for_a1]);
        gamecount_for_a1++;
    }
    else if (selected_array == 1)
    {
        // 修复：将赋值对象改为A2
        A2[gamecount_for_a2] = which_letter_str;
        Console.SetCursorPosition(gamecount_for_a2, 2);
        Console.Write(A2[gamecount_for_a2]);
        gamecount_for_a2++;
    }
    else 
    {
        // 修复：将赋值对象改为A3
        A3[gamecount_for_a3] = which_letter_str;
        Console.SetCursorPosition(gamecount_for_a3, 4);
        Console.Write(A3[gamecount_for_a3]);
        gamecount_for_a3++;
    }
    Console.ReadLine();
    if (gamecount_for_a1 == 15 || gamecount_for_a2 == 15 || gamecount_for_a3 == 15)
        break;
}

内容的提问来源于stack exchange，提问作者Beren Şenbay