csharp 一种询问用户答案的​​方法，验证答案是否正确并返回所需的值。如果答案无效，它会询问

Posted 2021-05-12

private static object GetUserDecision(string question, Type typeToReturn, Func<object, bool> validator)
{
    string answer;
    if (typeToReturn == typeof(bool))
    {
        do
        {
            Write(question + " (y/n) ");
            answer = Console.ReadLine();
            answer = answer.ToLower().Trim();
        } while (answer != "y" && answer != "n");
        return answer == "y";
    }
    else if (typeToReturn == typeof(string))
    {
        do
        {
            Console.WriteLine(question);
            answer = Console.ReadLine();
        } while (!validator(answer));
        return answer;
    }
    return null;
}

private static bool GetUserDecision(string question)
{
    return (bool) GetUserDecision(question, typeof (bool), o => true);
}