Question

有人能找到为什么这个循环不起作用？我是C＃的新手。

while (move == "r" || move == "s" || move == "f")
            {
                Console.Write("\nEnter your move: ");
                move = Console.ReadLine();


                switch (move)
                {
                    case "r":
                        Console.Write("\nYou have reloaded, press enter for Genius");
                        Console.ReadLine();
                        break;
                    case "s":
                        Console.Write("\nYou have shielded, press enter for Genius");
                        Console.ReadLine();
                        break;
                    case "f":
                        Console.Write("\nYou have fired, press enter for Genius");
                        Console.ReadLine();
                        break;
                    default:
                        Console.Write("\nInvalid move, try again\n\n");
                        break;
                }


            }

Answer 1

可能因为move在循环内初始化并且可能是null或空字符串，因为我在循环之前看不到代码我假设它没有初始化。

我的建议是使用一个设置为

的布尔标志

bool done = false;
while (!done)
{
    // do work
    if (move == finalMove) // or whatever your finish condition is
        done = true; // you could also put this as a case inside your switch
}

Answer 2

耶稣是对的，建议你接受他的回答。以下是您可以重写代码的方法。

do
            {
                Console.Write("\nEnter your move: ");
                move = Console.ReadLine();


                switch (move)
                {
                    case "r":
                        Console.Write("\nYou have reloaded, press enter for Genius");
                        Console.ReadLine();
                        break;
                    case "s":
                        Console.Write("\nYou have shielded, press enter for Genius");
                        Console.ReadLine();
                        break;
                    case "f":
                        Console.Write("\nYou have fired, press enter for Genius");
                        Console.ReadLine();
                        break;
                    default:
                        Console.Write("\nInvalid move, try again\n\n");
                        break;
                }


            }
 while (move == "r" || move == "s" || move == "f");

但请注意，如果你得到“r”，“s”或“f”之外的东西，你将打印Invalid move, try again，然后退出你的循环（他们不能再试一次）。你可能会想要分配一个键（可能是“q”表示退出），它会终止循环并将while条件更改为

while (move != "q");

while循环不工作？

2 个答案: