c# 如何让 keydown 和 button click 做同样的事情？

Question

我是 C# 的新手。我正在学习制作一个计算器，就像 ms windows 计算器一样。当我单击它时，按钮可以工作，但我希望小键盘也可以工作。假设用户键入“0”，它应该与他单击我的 gui 上的 0 按钮一样。这是我的 0 的按钮点击事件。

private void button0_Click(object sender, EventArgs e)
        {
            checkifequa();
            textBox1.Text = textBox1.Text + "0";
        }

如何让 keydown 起作用？

编辑

这是完整的来源。它是由 youtube 上的某个人写的，我只是在修改和尝试学习。请指出任何错误，并提出更好的方法。

<br/>
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;<p></p>

<p>namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        bool plus = false;
        bool minus = false;
        bool into = false;
        bool divd = false;
        bool equa = false;
        public Form1()
        {
            InitializeComponent();
        }</p>

    private void button0_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "0";
    }

    private void button1_Click(object sender, EventArgs e)
    {
        checkifequa();

        textBox1.Text = textBox1.Text + "1";
    }

    private void checkifequa()
    {
        if (equa)
            textBox1.Text = "";
        equa = false;
    }

    private void button2_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "2";
    }

    private void button3_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "3";
    }

    private void button4_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "4";
    }

    private void button5_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "5";
    }

    private void button6_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "6";
    }

    private void button7_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "7";
    }

    private void button8_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "8";
    }

    private void button9_Click(object sender, EventArgs e)
    {
        checkifequa();
        textBox1.Text = textBox1.Text + "9";
    }

    private void button11_Click(object sender, EventArgs e)
    {
        checkifequa();
        if(textBox1.Text.Contains("."))
        {
            return;
        }
        else
        {
        textBox1.Text=textBox1.Text+".";
        }

    }

    private void plusminus_Click(object sender, EventArgs e)
    {
        if (textBox1.Text.Contains("-"))
        {
            textBox1.Text = textBox1.Text.Remove(0, 1);
        }
        else
        {
            textBox1.Text = "-" + textBox1.Text;
        }
    }

    private void plus_Click(object sender, EventArgs e)
    {
        if (textBox1.Text == "")
        {
            return;
        }
        else
        { 
            plus = true;
            textBox1.Tag = textBox1.Text;
            textBox1.Text = "";
        }

    }

    private void equal_Click(object sender, EventArgs e)
    {
        equa = true;

        if (plus)
        {
            decimal dec = Convert.ToDecimal(textBox1.Tag) + Convert.ToDecimal(textBox1.Text);
            textBox1.Text = dec.ToString();

        }
        if (minus)
        {
            decimal dec = Convert.ToDecimal(textBox1.Tag) - Convert.ToDecimal(textBox1.Text);
            textBox1.Text = dec.ToString();

        }
        if (into)
        {
            decimal dec = Convert.ToDecimal(textBox1.Tag) * Convert.ToDecimal(textBox1.Text);
            textBox1.Text = dec.ToString();

        }
        if (divd)
        {
            decimal dec = Convert.ToDecimal(textBox1.Tag) / Convert.ToDecimal(textBox1.Text);
            textBox1.Text = dec.ToString();

        }
    }

    private void substract_Click(object sender, EventArgs e)
    {

        if (minus)
            if (textBox1.Text == "")
            {
                return;
            }
            else
            {
                minus = true;
                textBox1.Tag = textBox1.Text;
                textBox1.Text = "";
            }
    }

    private void multiply_Click(object sender, EventArgs e)
    {
        if (textBox1.Text == "")
        {
            return;
        }
        else
        {
            into = true;
            textBox1.Tag = textBox1.Text;
            textBox1.Text = "";
        }
    }

    private void divide_Click(object sender, EventArgs e)
    {
        if (textBox1.Text == "")
        {
            return;
        }
        else
        {
            divd = true;
            textBox1.Tag = textBox1.Text;
            textBox1.Text = "";
        }
    }

    private void clear_Click(object sender, EventArgs e)
    {
        plus = minus = into = divd = equa = false;
        textBox1.Text = "";
        textBox1.Tag = "";

    }




    void Form1_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar >= 48 && e.KeyChar <= 57)
        {
            switch (e.KeyChar)
            {
                case (char)48:
                    button0.PerformClick();
                    break;

                case (char)49:
                    button1.PerformClick();
                    break;
                case (char)50:
                    button2.PerformClick();
                    break;
                case (char)51:
                    button3.PerformClick();
                    break;
                case (char)52:
                    button4.PerformClick();
                    break;
                case (char)53:
                    button5.PerformClick();
                    break;
                case (char)54:
                    button6.PerformClick();
                    break;
                case (char)55:
                    button7.PerformClick();
                    break;
                case (char)56:
                    button8.PerformClick();
                    break;
                case (char)57:
                    button9.PerformClick();
                    break;

            }

        }  
    }


}

Answer 1

检查窗口的 PreviewKeyDown 事件并做这样的事情

if (e.KeyCode == Keys.NumPad0 || e.KeyCode == Keys.NumPad1)
{
   // Do what you want to do.
}