Question

您好，我目前正在尝试使用C＃中的Windows窗体应用制作猜谜游戏。我不知道该怎么做，所以我的随机数只能生成一次。例如，每次我单击我的猜测按钮（如guessButton_Click中所示）时，它都会生成一个不同的随机数。我只希望在此代码运行期间仅生成一次随机数。我该怎么做？任何帮助将不胜感激！

public partial class randomNumberForm : Form
{
    Random ranNum = new Random();
    int userGuess = 0;
    int numberOfGuesses = 0;

    public randomNumberForm()
    {
        InitializeComponent();
    }

    public void randomNumberForm_Load(object sender, EventArgs e)
    {


    }

    public void guessButton_Click(object sender, EventArgs e)
    {
        int randomNumber = ranNum.Next(101) + 1;
        if (int.TryParse(inputTextBox.Text, out userGuess))
        {
            if (userGuess < randomNumber)
            {
                answerLabel.Text = "Too low, try again.";
                numberOfGuesses++;
                guessLabel.Text = numberOfGuesses.ToString();
            }
            else if (userGuess > randomNumber)
            {
                answerLabel.Text = "Too high, try again.";
                numberOfGuesses++;
                guessLabel.Text = numberOfGuesses.ToString();
            }
            else if (userGuess == randomNumber)
            {
                answerLabel.Text = "You guessed the right number!";
                numberOfGuesses++;
                guessLabel.Text = numberOfGuesses.ToString();
            }
        }
        else
        {
            MessageBox.Show("Please enter a valid integer.");
        }

    }

Answer 1

看看您在int randomNumber = ranNum.Next(101) + 1;行中放置的位置-这是您的按钮单击事件的第一件事，它将在每次单击按钮时运行。

在类顶部将您的randomNumber变量声明为私有int。这将使它成为一个类变量，该变量只能从类本身内部访问。

将您的代码行randomNumber = ranNum.Next(101) + 1;移至randomNumberForm_Load函数中。这将在表单加载事件中填充randomNumber变量。

Answer 2

您必须具有全局变量。

请参见下面的示例

public partial class randomNumberForm : Form
{
    Random ranNum = new Random();
    int userGuess = 0;
    int numberOfGuesses = 0;
    int? randomNumber;

    public randomNumberForm()
    {
        InitializeComponent();
    }

    public void randomNumberForm_Load(object sender, EventArgs e)
    {


    }

    public void guessButton_Click(object sender, EventArgs e)
    {
        if (!randomNumber.HasValue) // first time run 
            randomNumber = ranNum.Next(101) + 1;
        if (int.TryParse(inputTextBox.Text, out userGuess))
        {
            if (userGuess < randomNumber)
            {
                answerLabel.Text = "Too low, try again.";
                numberOfGuesses++;
                guessLabel.Text = numberOfGuesses.ToString();
            }
            else if (userGuess > randomNumber)
            {
                answerLabel.Text = "Too high, try again.";
                numberOfGuesses++;
                guessLabel.Text = numberOfGuesses.ToString();
            }
            else if (userGuess == randomNumber)
            {
                answerLabel.Text = "You guessed the right number!";
                numberOfGuesses++;
                guessLabel.Text = numberOfGuesses.ToString();
            }
        }
        else
        {
            MessageBox.Show("Please enter a valid integer.");
        }

    }

每当点击事件句柄执行时，随机数都会重置

2 个答案: