c# - int whichAccount = int.Parse(Console.ReadLine()); 不工作的第二个循环

Question

这是我的第一篇文章，为我可能犯的错误和错误的格式道歉。

我遇到的问题是它第二次循环 int whichAccount = int.Parse(Console.ReadLine()); 不起作用，也不会接受我的意见。它引发异常“输入字符串的格式不正确”。第一次循环时一切正常。我在做什么错？谢谢。

class ATM
{

    const int SAVING_ACCOUNT = 1;
    const int DEBIT_CARD = 2;
    const int CREDIT_CARD = 3;
    const int INVESTMENT_ACCOUNT = 4;


    static double[] accountBalances = { 0.0, 1001.45, 850.0, -150.0, 10000.0 };

    static string[] accountNames = { "", "Savings Account", "Debit Card", 
                                       "Credit Card", "Investment Account" };


    static void Main()
    {
        char y;

        do {
            Console.Write("\tSAVING_ACCOUNT = 1;\n\tDEBIT_CARD = 2;\n\tCREDIT_CARD = 3;\n\tINVESTMENT_ACCOUNT = 4;\n\nPlease select account: ");

            int whichAccount = Int32.Parse(Console.ReadLine());

            DisplayBalance(whichAccount);

            Console.Write("\nDo you wish to see the balance of another account? Y/N: ");
            y = (char)Console.Read();
        } while (Char.IsLetter(y));
    }

    static void DisplayBalance(int whichAccount)
    {
        switch (whichAccount)
        {
            case 1: Console.WriteLine("\nAccount Balance of Savings Account = ${0}",  accountBalances[1]);
                    DateTime date = DateTime.Now;
                    Console.WriteLine("Current Date: {0} ", date );

                break;
            case 2: Console.WriteLine("{0}", accountBalances[2]);
                break;
            case 3: Console.WriteLine("{0}", accountBalances[3]);
                break;
            case 4: Console.WriteLine("{0}", accountBalances[4]);
                break;


        }
    }

Answer 1

问题是由于y = (char)Console.Read();

考虑使用以下内容来读取输入中的第一个字符。它将确保读取整个输入，不会在剩余的控制台文本中留下任何额外的字符或空格：

y = Console.ReadLine().Trim()[0];