一个开关中的默认语句,在while循环中,没有破坏c#

Question

基本的纸牌游戏,在while循环中有一个switch语句.case是用户输入选择的卡号,然后更换.那部分工作正常.但测试默认语句(任何数字不是0-5),它进入默认的console.writeline的无限循环,我不知道为什么它没有破坏.在以前的开关嵌套在while循环中它对我有效,但我从来没有在以前的默认值之前有这个无限循环问题.任何帮助/提示？

int userInput;
string userString;
Console.WriteLine("Would you like to replace a card?");
Console.WriteLine("Select which card you would like to replace, 1-5. Enter 0 to skip");
userString = Console.ReadLine();
int.TryParse(userString, out userInput);
while (userInput != 0)
{
    switch (userInput)
    {
        case 1:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        case 2:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        case 3:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        case 4:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        case 5:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        default:
            Console.WriteLine("Incorrect input, try again");
            break;
    }
}

Answer 1

问题: 您没有阅读用户输入while loop.

如果你没有阅读user inputin while循环它只适用one iteration,如果选择的数字介于1-5它之间就好了,但如果选择的数字是除了1-5它之外的一些东西default case而且你没有阅读userinput它仍然是相同的,所以它将进入infinite loop.

方案:

将以下语句放在while循环中以读取 userInput

userString = Console.ReadLine();
int.TryParse(userString, out userInput);

完整解决方案

int userInput;
string userString;
Console.WriteLine("Would you like to replace a card?");
Console.WriteLine("Select which card you would like to replace, 1-5. Enter 0 to skip");
userString = Console.ReadLine();
int.TryParse(userString, out userInput);
while (userInput != 0)
{
    switch (userInput)
    {
        case 1:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        case 2:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        case 3:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        case 4:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        case 5:
            userInput--;
            userHand[userInput] = cardDeck.GetOneCard();
            break;
        default:
            Console.WriteLine("Incorrect input, try again");
            break;
    }
      Console.WriteLine("Select which card you would like to replace, 1-5. Enter 0 to skip");
      userString = Console.ReadLine();
      int.TryParse(userString, out userInput);
}