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C#程序设计---->计算圆面积windows程序

2024-07-26 07:39:09   218人阅读

值得说的就是添加一个回车事件，

http://blog.csdn.net/nanwang314/article/details/6176604

 

private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)     {           if(e.KeyCode==Keys.Enter)           {                 MessageBox.Show("您在textBox1里按下了回车键");           }     }

　　这个样子就可以添加一个回车事件…………

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 CircleAreaW{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            double r;            r = double.Parse(txtR.Text);            MyCircle aCircle = new MyCircle(r);            double aArea = aCircle.CircleArea();            dblArea.Text = aArea.ToString("f4");        }        private void txtR_KeyDown(object sender, KeyEventArgs e)        {            if (e.KeyCode == Keys.Enter)            {                MessageBox.Show("您在textBox1里按下了回车键");                double r;                r = double.Parse(txtR.Text);                MyCircle aCircle = new MyCircle(r);                double aArea = aCircle.CircleArea();                dblArea.Text = aArea.ToString("f4");            }        }    }}
Form1.cs
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace CircleAreaW{    class MyCircle    {        double circleR;        public MyCircle(double dblR)        {            circleR = dblR;        }        public double CircleArea()        {            double dblArea = Math.PI * circleR * circleR;            return dblArea;        }    }}

 

C#程序设计---->计算圆面积windows程序


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