这是我班上的代码。我正试图找出如何访问DisplayQuestion中的问题列表。我有一个program.cs，显示一个测验菜单，我不能有任何静态。
public string Question { get; set; }
public List<string> Choices { get; set; }
public char[] CorrectChoice = { 'A', 'B', 'C', 'D' };
public List<string> Questions { get; set; }
这是我课堂上的方法。我需要在这个课程中多次访问这个列表。
public void NewQuestion()
{
Questions = new List<string>();
Choices = new List<string>();
Console.WriteLine("Enter the question: ");
Questions.Add(Console.ReadLine());
Console.WriteLine("Enter Choice 1 for the question:");
Choices.Add(Console.ReadLine());
Console.WriteLine("Enter Choice 2 for the question: ");
Choices.Add(Console.ReadLine());
Console.WriteLine("Enter Choice 3 for the question: ");
Choices.Add(Console.ReadLine());
Console.WriteLine("Enter Choice 4 for the question:");
Choices.Add(Console.ReadLine());
// Console.WriteLine("Enter the correct choice(A,B,C,D)");
foreach (string choice in Choices)
{
Console.WriteLine();
Console.WriteLine(choice);
}
}
public void DisplayQuestions()
{
foreach(string question in Questions)
{
Console.WriteLine();
Console.WriteLine(question);
}
}
答案 0 :(得分：0)
尝试在全局部分中声明并初始化为null，或者为其创建一个具有适当getter setter方法的类。
答案 1 :(得分：0)
不要觉得只能在一堂课中做所有事情。即使是将问题分离到单独的类中的粗略，冗长的尝试也有助于可读性，可维护性和理智性。然后，你只是一个远离优秀代码的深思熟虑的重构。
您正在使用面向OBJECT语言的C＃。因此，请使用对象进行处理。
using System;
using System.Collections.Generic;
using System.Linq;
namespace Quiz_StackOverflow
{
class Program
{
static void Main(string[] args)
{
var quizGenerator = new QuizGenerator();
var quiz = quizGenerator.GenerateQuiz();
var quizProctor = new QuizProctor();
var grade = quizProctor.ProctorQuiz(quiz);
Console.WriteLine(grade.ToString());
Console.WriteLine("Done. Press any key to exit.");
Console.ReadKey();
}
}
public class QuizGenerator
{
public Quiz GenerateQuiz()
{
var problems = GenerateProblems();
var quiz = new Quiz()
{
Problems = problems
};
return quiz;
}
private List<Problem> GenerateProblems()
{
List<Problem> problems = new List<Problem>();
int numChoices = InputValidator.GetPositiveNumber("Enter number of problems: ");
for (int i = 0; i < numChoices; i++)
{
Problem problem = GenerateProblem();
problems.Add(problem);
}
return problems;
}
private Problem GenerateProblem()
{
var question = GenerateQuestion();
var choices = GenerateChoices();
var answer = GenerateAnswer(choices);
var problem = new Problem()
{
Question = question,
Choices = choices,
Answer = answer
};
return problem;
}
private string GenerateQuestion()
{
Console.WriteLine("Enter the question: ");
string question = Console.ReadLine();
return question;
}
private List<string> GenerateChoices()
{
List<string> choices = new List<string>();
int numChoices = InputValidator.GetPositiveNumber("Enter number of choices for the question: ");
for (int i=1; i<=numChoices; i++)
{
string choice = GenerateChoice(i);
choices.Add(choice);
}
return choices;
}
private string GenerateChoice(int index)
{
Console.WriteLine($"Enter Choice {index} for the question: ");
string choice = Console.ReadLine();
return choice;
}
private Answer GenerateAnswer(List<string> choices)
{
Console.WriteLine("Enter the answer: ");
string userChoice = InputValidator.GetUserChoice(new Problem() { Choices=choices });
var answer = new Answer()
{
Value = userChoice
};
return answer;
}
}
public class QuizProctor
{
public Grade ProctorQuiz(Quiz quiz)
{
var answers = new List<Answer>();
foreach(Problem problem in quiz.Problems)
{
Answer answer = ProctorProblem(problem);
answers.Add(answer);
}
Grade grade = quiz.Grade(answers);
return grade;
}
private Answer ProctorProblem(Problem problem)
{
string userChoice = InputValidator.GetUserChoice(problem);
var answer = new Answer()
{
Value = userChoice
};
return answer;
}
}
public class Quiz
{
public List<Problem> Problems { get; set; }
public Grade Grade(List<Answer> answers)
{
List<Answer> answerKey = Problems.Select(x => x.Answer).ToList();
var rawResults = new List<Tuple<Answer, Answer>>();
for(int i=0; i<answers.Count; i++)
{
Answer correct = answerKey[i];
Answer provided = answers[i];
rawResults.Add(new Tuple<Answer, Answer>(correct, provided));
}
return new Grade(rawResults);
}
}
public class Grade
{
private List<Tuple<Answer, Answer>> RawResults { get; set; }
public decimal Percent
{
get { return decimal.Divide(RawResults.Count(x => x.Item1.Equals(x.Item2)), RawResults.Count); }
}
public Grade(List<Tuple<Answer, Answer>> rawResults)
{
RawResults = rawResults;
}
public override string ToString()
{
return string.Format("You scored a {0:P2}.", Percent);
}
}
public class Problem
{
public string Question { get; set; }
public List<string> Choices { get; set; }
public Answer Answer { get; set; }
public string Prompt()
{
Func<int, char> numberToLetter = (int n) =>
{
return (char)('A' - 1 + n);
};
string prompt = Question;
for (int i=0; i<Choices.Count; i++)
{
string choice = Choices[i];
prompt += $"\n{numberToLetter(i+1)}) {choice}";
}
return prompt;
}
}
public class Answer
{
public string Value { get; set; }
public override string ToString()
{
return Value + "";
}
public override bool Equals(object obj)
{
if (obj == null || GetType() != obj.GetType())
{
return false;
}
return (obj as Answer).Value.Equals(Value);
}
public override int GetHashCode()
{
return Value.GetHashCode();
}
}
public static class InputValidator
{
public static int GetPositiveNumber(string prompt)
{
int number = -1;
while (number < 0)
{
Console.Write(prompt);
string input = Console.ReadLine();
try
{
number = int.Parse(input);
}
catch (Exception)
{
Console.WriteLine("ERROR: Please input a positive number.");
}
}
return number;
}
public static string GetUserChoice(Problem problem)
{
Func<char, int> letterToNumber = (char c) =>
{
if (char.IsLower(c))
{
return (int)(c - 'a' + 1);
}
return (int)(c - 'A' + 1);
};
char userChoiceLetter = '_';
while (!char.IsLetter(userChoiceLetter))
{
Console.WriteLine(problem.Prompt());
Console.Write("Answer: ");
var input = Console.ReadLine();
try
{
userChoiceLetter = char.Parse(input);
}
catch (Exception)
{
Console.WriteLine("ERROR: Please input a letter corresponding to your choice.");
}
}
int answerIndex = letterToNumber(userChoiceLetter) - 1;
return problem.Choices[answerIndex];
}
}
}