第一节课作业

设计一个Form

1. 窗体：三个button，一个textBox

image.png

2. 属性设置

image.png

编写代码

双击每个控件，就可以进行代码编辑

1. 显示

  private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "Hello World";//在文本框中显示“hello world”
        }

2. 清除

 private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";//将文本框显示的内容清空
        }

3. 弹出一个新的对话框

  private void button3_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Hello World");//弹出一个对话框，显示“Hello world"
        }

(一) 实现以下效果

image.png

第二节课作业
实训指导：乘法计算器

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;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void maskedTextBox1_MaskInputRejected(object sender, MaskInputRejectedEventArgs e)
        {

        }

        private void maskedTextBox4_MaskInputRejected(object sender, MaskInputRejectedEventArgs e)
        {

        }

        private void label5_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            float num1 = 0;
            float num2 = 0;
            float result=0;
            num1=float.Parse(textBox1.Text);//将文本框输入的字符转化为数值
            num2=float.Parse(textBox2.Text);
            result = num1 * num2;
            textBox3.Text = result.ToString();//将数值转换成字符

        }

        private void button3_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
        }
    }
}

image.png