题目概述:
VS Windows窗体应用(.NET Framework) 上面开发一个定时器。
编程:
namespace _003_7_27
{
public partial class Form1 : Form{int count;//用于定时器计数int time;//存储设定的定时值public Form1(){InitializeComponent();}private void label3_Click(object sender, EventArgs e){}private void Form1_Load(object sender, EventArgs e){for(int i=1;i<100;i++)//计时范围{comboBox1.Items.Add(i.ToString()+" 秒");//初始化下拉框内容}}private void timer1_Tick(object sender, EventArgs e)//定时器事件{count++;//记当前秒label3.Text = (time - count).ToString() + "秒";//显示剩余时间progressBar1.Value = count;//设置进度条进度if(count==time){timer1.Stop();//时间到,停止计时System.Media.SystemSounds.Asterisk.Play();//提示音MessageBox.Show("时间到了!", "提示");//弹出提示框,标题在后面,内容在前面}}private void button1_Click(object sender, EventArgs e)//开始计时按钮事件{string str = comboBox1.Text;string data;data = str.Substring(0, 2); time = Convert.ToInt16(data);//Convert将一个字符转化成一个变量 第0位开始2个字符 progressBar1.Maximum = time;//进度条最大数值timer1.Start();//计时器计时开始}private void comboBox1_SelectedIndexChanged(object sender, EventArgs e){}private void progressBar1_Click(object sender, EventArgs e){}}
}
上机实践: