首页 > 代码库 > C#程序设计---->计算圆面积windows程序
C#程序设计---->计算圆面积windows程序
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"); } } }}
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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