C#—实验8.8和实验8.9

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/* * 利用Random类产生10个[10,99]之间的随机数，并将这10个随机数在列表框中显示出来，每个数占一项。 * 用户选择某项后，在右边标签中显示所选内容。 */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 WindowsFormsApplication2{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            button1.Text = "结束";                        string[] s = new string[10];            Random r = new Random();            for (int i = 0; i < 10; i++)                s[i] = r.Next(10, 99).ToString();            listBox1.Items.AddRange(s);            listBox1.SelectedIndex = 0;        }        private void button1_Click(object sender, EventArgs e)        {            Application.Exit();        }        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)        {            label1.Text = listBox1.SelectedItem.ToString();        }    }}

运行结果：

/* * （1）控件依次是：文本框、组合框、文本框、标签、文本框和按钮； * （2）各个控件名字默认； * （3）组合框Items属性中加入+、-、*、/，且DropDownList。 */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 WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            button1.Text = "选择不同运算符，单击按钮进行不同运算";            label1.Text = "=";            string []s=new string[4]{"+","-","*","/"};            comboBox1.Items.AddRange(s);        }        private void button1_Click(object sender, EventArgs e)        {            switch (comboBox1.Text)            {                case "+":                    textBox3.Text=(Convert.ToDouble(textBox1.Text)+Convert.ToDouble(textBox2.Text)).ToString();                    break;                case "-":                    textBox3.Text=(Convert.ToDouble(textBox1.Text)-Convert.ToDouble(textBox2.Text)).ToString();                    break;                case "*":                    textBox3.Text=(Convert.ToDouble(textBox1.Text)*Convert.ToDouble(textBox2.Text)).ToString();                    break;                case "/":                    textBox3.Text =(Convert.ToDouble(textBox1.Text)/Convert.ToDouble(textBox2.Text)).ToString();                    break;            }        }    }}

运行结果：

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