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用visio studio 2012簡單學習上位機的做法，做了一個簡單的倒計時器。有進度條和提示框，大家互相學習。
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 阿三
{
public partial class Form1 : Form
{
int count,time;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
int i;
for (i = 0; i < 100; i++)
{
comboBox1.Items.Add(i.ToString()+" 秒");
}
label3.Text = " ";
}
private void timer1_Tick(object sender, EventArgs e)
{
count++;
label3.Text=(time-count).ToString()+"秒";
progressBar1.Value = count;
if (count == time)
{
timer1.Stop();
System.Media.SystemSounds.Asterisk.Play();
MessageBox.Show("時間到了！", "提示");
count = 0;
}
}
private void button1_Click(object sender, EventArgs e)
{
string str=comboBox1.Text;
time = Convert.ToInt16(str.Substring(0, 2));
progressBar1.Maximum = time;
timer1.Start();
}
}
}
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