选项是/否C#控制台

问题描述

我正在通过控制台为Currency Converter创建一个C#程序.最后，我要插入继续?(是/否)".用户必须在这里进行选择.我已经尝试过了，但是没用

I'm creating a C# program for the Currency Converter by console.At the end I would to insert "Continue? (yes/no)". Here the user have to chose. I've tried this but it doesn't work

float Dollaro = 1.32f, Euro;
float Cambio;
string EuroStr;


        Console.Write("Euro: ");
        EuroStr = Console.ReadLine();
        Euro = float.Parse(EuroStr);

        Cambio = Dollaro * Euro;

        Console.WriteLine("Dollaro: " + Cambio);
        Console.WriteLine("Vuoi continuare? (yes/no)");
        Console.ReadLine();
        string risposta = Console.ReadLine();
        do
        {
            if (risposta.Equals("Y"))
            {
                Console.WriteLine("Yes");
                break;
            }
            else if (risposta.Equals("N"))
            {
                Console.WriteLine("No");
                break;
            }

        } while (risposta == "N");

推荐答案

        float Dollaro = 1.32f, Euro, Cambio;
        string EuroStr;
        ConsoleKeyInfo risposta;
        do
        {
            Console.Write ( "Euro: " );
            EuroStr = Console.ReadLine ();
            bool result = Single.TryParse ( EuroStr, out Euro );
            if ( result )
            {
                Cambio = Dollaro * Euro;
                Console.WriteLine ( "Dollaro: " + Cambio );
            } else {
                Console.WriteLine ( "Please enter a number" );
            }
            bool check = false;
            do {
                Console.Write ( "\nVuoi continuare? (yes/no) " );
                risposta = Console.ReadKey ( true );
                check = !( ( risposta.Key == ConsoleKey.Y ) || ( risposta.Key == ConsoleKey.N ) );
            } while ( check );
            switch ( risposta.Key )
            {
                case ConsoleKey.Y: Console.WriteLine ( "Yes" ); break;
                case ConsoleKey.N: Console.WriteLine ( "No" ); break;
            }
        } while ( risposta.Key != ConsoleKey.N );

我更改了一些内容:

• 如果我输入欧元的字符- FormatException .所以我添加了 TryParse();
• 我已将响应从 string 更改为 ConsoleKeyInfo -这样可以更轻松地检查"Y"或"N"，而且我认为更清晰，并且没有需要使用ToLower()投射用户输入并将其与字符串进行比较；
• 还检查用户是否按"Y"或"N"，而输入内容不同，则将出现相同的消息- Console.Write("\ nVuoicontinuare?(yes/no)");

• if I enter a character for the Euro - FormatException . So I've added a TryParse();
• I've changed the response from string to ConsoleKeyInfo - this makes the check for "Y" or "N" easier and I think clearer, and there is no need to cast the user input with ToLower() and compare it with a string;
• also a check if the user presses "Y" or "N", while the input is different, the same message will appear - Console.Write ( "\nVuoi continuare? (yes/no) " );

通常，您应该过滤掉所有来自用户的data \ info(无论如何)，以避免出现异常.

In general you should filter all data\info ( whatever ) comes from the user, to avoid exception.

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