C＃将用户输入存储在字符串数组中

I am trying to make a potential two player program where one user is prompted to enter a question and then prompted to enter the answer to that question both of which will be stored in a two dimensional array. The first player will be able to enter up to 10 questions. After both the question and answer to that question are stored, I would like to then be able to have the second player prompted to answer the questions the first player asked.

我正在尝试创建一个潜在的两个播放器程序，其中一个用户被提示输入问题，然后提示输入该问题的答案，这两个问题都将存储在二维数组中。第一位玩家最多可以输入10个问题。在存储了该问题的问题和答案之后，我希望能够让第二个玩家回答第一个玩家提出的问题。

Right now I'm stuck at a pretty basic part which is storing the questions and answers in the array.

现在我陷入了一个非常基本的部分，它将问题和答案存储在数组中。

Here is the code I have so far my first class:

这是我到目前为止我的第一堂课的代码：

class MakeOwnQuestion
{
    string question;
    string answer;
    string[,] makequestion = new string[10, 2];

    public void MakeQuestion(string question, string answer, int index)
    {
        if (index < makequestion.Length)
        {
            makequestion[index, 0] = question;
            makequestion[index, 1] = answer;
        }
    }

My second class:

我的第二堂课：

class MakeOwnQuestionUI
{
    MakeOwnQuestion newquestion;

    public void MainMethod()
    {
        PopulateArray();
    }

    void PopulateArray()
    {
        string question;
        string answer;
        Console.WriteLine("Enter Your Question: ");
        question = Console.ReadLine();

        Console.WriteLine("Enter Your Answer: ");
        answer = Console.ReadLine();

        newquestion.MakeQuestion(question, answer, 0);

        Console.WriteLine("Enter Your Question: ");
        question = Console.ReadLine();

        Console.WriteLine("Enter Your Answer: ");
        answer = Console.ReadLine();

        newquestion.MakeQuestion(question, answer, 1);
    }
}

I keep getting the same error message after the user enters their first answer "Object reference not set to an instance of an object"

在用户输入第一个答案“对象引用未设置为对象的实例”后，我不断收到相同的错误消息

1 个解决方案

#1

You need to initialize your newquestion instance:

您需要初始化newquestion实例：

MakeOwnQuestion newquestion = new MakeOwnQuestion();

I'd also recommend you use GetLength rather than Length for a multidimensional array:

我还建议你使用GetLength而不是Length作为多维数组：

if (index < makequestion.GetLength(0))
{
    ...
}

Or better yet, just a List<T> of some type, e.g. Tuple<string, string>:

或者更好的是，只是某种类型的List ，例如元组：，string>

class MakeOwnQuestion
{
    List<Tuple<string, string>> makequestion = new List<Tuple<string, string>>();

    public void MakeQuestion(string question, string answer, int index)
    {
        makequestion.Add(Tuple.Create(question, answer));
    }
}

#1