c# - 按 Enter 键时调用按钮单击事件 - c#

Question

我是 c# 新手 - 我想在按 Enter 时触发按钮单击事件。我的代码无法正常工作 -

问题是，当我按 Enter 键提交某些值时，它会显示应该显示的消息框，但是在按 Enter 键确认消息框的“确定”按钮时，即使我不按 Enter 键或输入任何其他内容，它也会自动再次触发按钮单击事件值(value)。

public partial class Form1 : Form
{
    int n1, n2 = 0;
    private static readonly Random getrandom = new Random();
    private static readonly object syncLock = new object();
    public int GetRandomNumber(int min, int max)
    {
        lock (syncLock)
        { // synchronize
            return getrandom.Next(min, max);
        }
    }

    public int tQuestion()
    {
        n1 = GetRandomNumber(2, 11);
        n2 = GetRandomNumber(2, 11);

        string tQues = n1 + " x " + n2 + " = ";

        label1.Text = tQues;

        return 0;
    }


    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

        tQuestion();

    }

    private void label1_Click(object sender, EventArgs e)
    {

    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        textBox1.KeyDown += new KeyEventHandler(tb_KeyDown);
    }

    public void button1_Click(object sender, EventArgs e)
    {

        string tAns = textBox1.Text;
        int answer = n1 * n2;

        string tOrgAns = answer.ToString();

        if (tAns == tOrgAns)
            MessageBox.Show("Your answer is Corect", "Result", MessageBoxButtons.OK,MessageBoxIcon.Exclamation );
        else
            MessageBox.Show("Your answer is WRONG", "Result", MessageBoxButtons.OK, MessageBoxIcon.Stop);
        textBox1.Text = "";
        textBox1.Focus();
        tQuestion();
    }

    static void tb_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            button1_Click(sender, e);
        }
    }

此外，代码仅在我删除 static 时才有效。来自static void tb_KeyDown(object sender, KeyEventArgs e) - 否则会出现错误:

An object reference is required for the non-static field, method, or property

请帮助我 - 我是 c# 和 .Net 新手

Answer 1

将按钮点击事件处理程序提取到单独的方法中(例如VerifyAnswer)并从两个地方调用它:

public void button1_Click(object sender, EventArgs e)
{
    VerifyAnswer();
}

// NOTE: static modifier removed
private void tb_KeyDown(object sender, KeyEventArgs e) 
{
    if (e.KeyCode == Keys.Enter)        
        VerifyAnswer();
}

private void VerifyAnswer()
    string tAns = textBox1.Text;
    int answer = n1 * n2;

    string tOrgAns = answer.ToString();

    if (tAns == tOrgAns)
        MessageBox.Show("Your answer is Corect", "Result", MessageBoxButtons.OK,MessageBoxIcon.Exclamation );
    else
        MessageBox.Show("Your answer is WRONG", "Result", MessageBoxButtons.OK, MessageBoxIcon.Stop);
    textBox1.Text = "";
    textBox1.Focus();
    tQuestion();
}

不要尝试手动执行事件处理程序 - 它们的目的只是处理事件。