未知原因所期望的标识符c#

Question

试图制作一个简单的应用程序，它会问一些问题。但由于某种原因，我的AskQuestion函数无法工作。我计划在以后添加一个容易交换的数据库，这就是为什么我尝试采用一种稍微模块化的方法，而且由于我是初学者，我不知道自己做错了什么。唯一的错误是AskQuestion类的第21行。

错误是：

期望CS1001标识符 CS1514 {预期 CS1513 }预期

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Quiz
{
    class Program
    {
        // Question Base
        class Question
        {
            public String question = "Empty Question";
            public String correctanswer = "Empty Answer";
            public String givenanswer = "Empty Answer";
            public String response = "Empty Response.";
            public bool cleared = false;
        }
        // Ask Base
        class void AskQuestion(Question Q)
        {
            while (Q.cleared == false)
            {
                Console.WriteLine(Q.question);
                Q.givenanswer = Console.ReadLine();
                Q.givenanswer.ToLower();
                if (Q.givenanswer == Q.correctanswer)
                {
                    Console.WriteLine(Q.response);
                    Q.cleared = true;
                }
                else
                {
                    Console.WriteLine("Wrong. Try again.");
                }
            }

        }

        // Main Function
        void Main(string[] args)
        {
            string Name;
            Console.WriteLine("Welcome challenger! You're going to have a good time.");
            Console.WriteLine("Make sure you use proper grammar. Or you may be stuck for no reason.");
            Console.WriteLine("What is your name challenger?");
            Name = Console.ReadLine();
            Console.WriteLine("Welcome {0} to the challenge. I wish you best of luck. You will need it.",Name);
            Question Q1 = new Question();
            Q1.question = "What is the color of the sun?";
            Q1.correctanswer = "White";
            Q1.response = "Correct. Despite the fact it appears Yellow on earth, if you observe the sun from space, you would see it's true color. White.";
            AskQuestion(Q1);
            Q1.cleared = true;
            Console.WriteLine("Nice little warmup. But, lets get a bit serious.");
        }
    }
}

Answer 1

改变这个

class void AskQuestion(Question Q)

至

void AskQuestion(Question Q)

这应该是一种方法。关键字class告诉编译器要在out类Program中创建内部类。

Answer 2

Q.givenanswer.ToLower();不使Q.givenanswer小写-它返回一个新的小写字符串，您需要分配给一个变量，或者只是`Q.givenanswer = Q.givenanswer.ToLower()；