C#，使用布尔值验证用户输入的字母和空格

Question

我正在制作一个程序来反转字符串并且不允许除字母和空格之外的任何其他内容，问题是如果我输入无效输入然后尝试输入有效输入它只会保留打印错误。我认为问题与我的 while 循环和 bool 结果有关，但我无法弄清楚。请帮忙，谢谢！

        static void Reverse()
        {
            string name;
            Console.Write("Enter your name: ");
            name = Console.ReadLine();

            bool result = name.All(c => char.IsWhiteSpace(c) || char.IsLetter(c));
            if (Regex.IsMatch(name, @"^[a-zA-Z- ]+$"))  // Validates the input for characters and/or spaces
            {
                char[] charArr = name.ToCharArray();
                Array.Reverse(charArr);
                string nameRev = new string(charArr);
                Console.WriteLine("String is {0}", nameRev);
            }
            else
            {
                while (name == String.Empty || result == false) //Should validate the input for whitespace or letter if it doesn't pass the first validation
                {
                    Console.Write("Error! Enter your name, only letters allowed: ");
                    name = Console.ReadLine();
                }
            }

Answer 1

您需要将 while 循环包裹在 hole 序列周围，而不是仅仅将其放在 else 语句中。

示例：

static void Reverse()
{
    // Continues executing as long as result stays false.
    bool result;
    do 
    {
        string name;
        Console.Write("Enter your name: ");
        name = Console.ReadLine();

        result = name.All(c => char.IsWhiteSpace(c) || char.IsLetter(c));
        if (Regex.IsMatch(name, @"^[a-zA-Z- ]+$"))
        {
            char[] charArr = name.ToCharArray();
            Array.Reverse(charArr);
            string nameRev = new string(charArr);
            Console.WriteLine("String is {0}", nameRev);
        }
        else 
        {
            Console.WriteLine("Error! Only letters allowed");
        }
    }
    while (!result);
}

C#，使用布尔值验证用户输入的字母和空格

C#, Validating user input for letters and whitespace using boolean

c#

boolean

input

while-loop