在 do...while 中将相关表达式匹配设置为 false

我正在尝试编写一些非常基本的代码，但我也在正则表达式上挑战自己。我已经能够将代码搞乱到一定程度，但我真正遇到的问题是我试图在表达式为 false 时运行 do...while 循环。此时我完全没有收到任何错误，但 do...while 循环继续运行。

我在下面附上了相关代码，希望对您有所帮助。

先感谢您

if (tollResponse == "yes")
{
    Console.WriteLine("How much do you pay per trip?");
    string tollTax = Console.ReadLine();
    Match toll = Regex.Match (tollTax, @"[\d .]+");

    if (toll.Success)
    {
        Math.Round(Convert.ToDecimal(tollTax), 2);
        Console.WriteLine("Good lord that's high... well it's your money");
    }
    else
    {
        do
        {
            Console.WriteLine("Please enter a proper number");
            tollTax = Console.ReadLine();
        }
        while (toll.Success == false);
    }
}

简单的编码错误...添加到代码中的注释来解释问题

if (tollResponse == "yes")
{
    Console.WriteLine("How much do you pay per trip?");
    string tollTax = Console.ReadLine();
    //toll.Success gets set here.
    Match toll = Regex.Match(tollTax, @"[\d .]+");

    if (toll.Success)
    {
        //Not sure why you are doing this since you aren't using it in the given code
        Math.Round(Convert.ToDecimal(tollTax), 2);
        Console.WriteLine("Good lord that's high... well it's your money");
    }
    else
    {
        //This is an infinite loop because toll.Success is never set again.
        do
        {
            Console.WriteLine("Please enter a proper number");
            tollTax = Console.ReadLine();
        } while (toll.Success == false);
    }
}

我认为你想要什么

if (tollResponse == "yes")
{
    Console.WriteLine("How much do you pay per trip?");

    //Loop over the Console.ReadLine() using the else statement and exit if it is right the first time
    do
    {
        string tollTax = Console.ReadLine();
        //toll.Success gets set here.
        Match toll = Regex.Match(tollTax, @"^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*(?:\.[0-9]{2})?$");

        if (toll.Success)
        {
            Console.WriteLine("Good lord that's high... well it's your money");
            //will exit
        }
        else
        {
            Console.WriteLine("Please enter a proper number");
        } 
    } while (toll.Success == false);
}

Note:还删除了 1 行重复代码，更新为使用我推荐的正则表达式并删除Math.Round