在C＃计算器上使用键盘作为输入设备

时间：2015-03-01 04:24:33

标签： c#

所以我有一个用C＃编写的工作计算器（下面包括完整代码），我只能使用计算器按钮输入数字和符号。我希望能够使用键盘和按钮作为输入设备。我的问题是我不知道怎么回事，因为我只学了一个星期的c＃。我希望你们中的一位比我更有经验和更聪明的人来编写代码:)包括完整的计算器程序，并感谢您提前。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        string input = string.Empty;
        string operand1 = string.Empty;
        string operand2 = string.Empty;
        char operation;
        double result = 0.0;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            input += "1";
            this.textBox1.Text += input;
        }

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

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

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

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

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

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

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

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

        private void button10_Click(object sender, EventArgs e)
        {
            operand2 = input;
            double num1, num2;
            double.TryParse(operand1, out num1);
            double.TryParse(operand2, out num2);

            this.textBox1.Text = "";
            this.input = string.Empty;
            this.operand1 = string.Empty;
            this.operand2 = string.Empty;

            if (operation == '+')
            {
                result = num1 + num2;
                textBox1.Text = result.ToString();
            }
            else if (operation == '-')
            {
                result = num1 - num2;
                textBox1.Text = result.ToString();
            }
            else if (operation == '*')
            {
                result = num1 * num2;
                textBox1.Text = result.ToString();
            }
            else if (operation == '/')
            {
                if (num2 != 0)
                {
                    result = num1 / num2;
                    textBox1.Text = result.ToString();
                }
                else
                {
                    textBox1.Text = "undefined";
                }

            }
        }      

         private void button11_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            this.input = string.Empty;
            this.operand1 = string.Empty;
            this.operand2 = string.Empty;
        }

        private void button12_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            input += "0";
            this.textBox1.Text += input;
        }

        private void button13_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            operand1 = input;
            operation = '*';
            input = string.Empty;
            this.textBox1.Text += input;
        }

        private void button14_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            operand1 = input;
            operation = '+';
            input = string.Empty;
            this.textBox1.Text += input;

        }

        private void button15_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            operand1 = input;
            operation = '-';
            input = string.Empty;
            this.textBox1.Text += input;
        }

        private void button16_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            operand1 = input;
            operation = '/';
            input = string.Empty;
            this.textBox1.Text += input;
        }
    }
}

2 个答案:

答案 0 :(得分：0)

查看KeyDown事件：https://msdn.microsoft.com/en-us/library/system.windows.forms.control.keydown%28v=vs.110%29.aspx

...或KeyPress事件（取决于您希望如何处理事情）：https://msdn.microsoft.com/en-us/library/system.windows.forms.control.keypress(v=vs.110).aspx

...和Keys枚举：https://msdn.microsoft.com/en-us/library/system.windows.forms.keys%28v=vs.110%29.aspx

您需要适当处理KeyDown事件（如果您选择，则KeyPress），如下例所示：

private void Form1_KeyDown(object sender, KeyEventArgs e) {
    if (e.KeyCode == Keys.NumPad0){
        // do something
    }
}

别忘了订阅活动：

this.KeyDown += Form1_KeyDown;

答案 1 :(得分：0)

创建KeyPressEventHandler并分配方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        string input = string.Empty;
        string operand1 = string.Empty;
        string operand2 = string.Empty;
        char operation;
        double result = 0.0;

        public Form1()
        {
            InitializeComponent();

            this.KeyPress +=
                new KeyPressEventHandler(Form1_KeyPress);
        }

        void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            //keypressed
            System.Console.WriteLine(e.KeyChar);
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            input += "1";
            this.textBox1.Text += input;
        }

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

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

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

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

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

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

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

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

        private void button10_Click(object sender, EventArgs e)
        {
            operand2 = input;
            double num1, num2;
            double.TryParse(operand1, out num1);
            double.TryParse(operand2, out num2);

            this.textBox1.Text = "";
            this.input = string.Empty;
            this.operand1 = string.Empty;
            this.operand2 = string.Empty;

            if (operation == '+')
            {
                result = num1 + num2;
                textBox1.Text = result.ToString();
            }
            else if (operation == '-')
            {
                result = num1 - num2;
                textBox1.Text = result.ToString();
            }
            else if (operation == '*')
            {
                result = num1 * num2;
                textBox1.Text = result.ToString();
            }
            else if (operation == '/')
            {
                if (num2 != 0)
                {
                    result = num1 / num2;
                    textBox1.Text = result.ToString();
                }
                else
                {
                    textBox1.Text = "undefined";
                }

            }
        }

        private void button11_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            this.input = string.Empty;
            this.operand1 = string.Empty;
            this.operand2 = string.Empty;
        }

        private void button12_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            input += "0";
            this.textBox1.Text += input;
        }

        private void button13_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            operand1 = input;
            operation = '*';
            input = string.Empty;
            this.textBox1.Text += input;
        }

        private void button14_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            operand1 = input;
            operation = '+';
            input = string.Empty;
            this.textBox1.Text += input;

        }

        private void button15_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            operand1 = input;
            operation = '-';
            input = string.Empty;
            this.textBox1.Text += input;
        }

        private void button16_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "";
            operand1 = input;
            operation = '/';
            input = string.Empty;
            this.textBox1.Text += input;
        }
    }
}

要获得按下哪个键，请使用

e.KeyChar
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