源码：
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 WindowsFormsProgressBar
{
public partial class Form1 : Form
{
private void outLog(string str)
{
txtOut.AppendText(DateTime.Now.ToString() + str + "\n");
}
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
btnBegin.Enabled = false;
btnStop.Enabled = false;
btnFinish.Enabled = false;
}
private void btnSetup_Click(object sender, EventArgs e)
{
try
{
if (txtInput.Text.Trim() != "")
{
progressBar1.Minimum = 0;
progressBar1.Maximum = Convert.ToInt32(txtInput.Text);
progressBar1.Step = -1;
progressBar1.Value = progressBar1.Maximum;
btnSetup.Enabled = false;
btnBegin.Enabled = true;
outLog("时间设置正确，请按开始键继续。。。");
}
}
catch {
MessageBox.Show("请输入一个正确的秒数！");
}
}
private void btnBegin_Click(object sender, EventArgs e)
{
btnBegin.Enabled = false;
btnStop.Enabled = true;
btnFinish.Enabled = true;
timer1.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
if (progressBar1.Value > progressBar1.Minimum)
{
progressBar1.PerformStep();
string per = Convert.ToDouble(progressBar1.Value) / Convert.ToDouble(progressBar1.Maximum) * 100 + "%";
if (per != "0%")
{
outLog("进度条正在工作，剩余：" + per);
}
//else
//{
// outLog("进度条已完成");
// btnSetup.Enabled = true;
//}
}
else
{
outLog("进度完成！");
timer1.Stop();
btnBegin.Enabled = false;
btnStop.Enabled = false;
btnFinish.Enabled = false;
btnSetup.Enabled = true;
}
}
private void btnStop_Click(object sender, EventArgs e)
{
if (timer1.Enabled == true)
{
outLog("stop");
btnStop.Text = "继续";
timer1.Stop();
}
else {
outLog("继续工作");
btnStop.Text = "暂停";
timer1.Start();
}
}
private void btnFinish_Click(object sender, EventArgs e)
{
outLog("停止工作\n==================");
timer1.Enabled = false;
progressBar1.Value = 0;
btnSetup.Enabled = true;
btnBegin.Enabled = false;
btnStop.Enabled = false;
btnFinish.Enabled = false;
btnStop.Text = "暂停";
}
}
}
练习笔记：
1、 Convert.ToInt32(txtInput.Text)，类型强制转换，字符串型数据转为整型数据。
2、progressBar1.PerformStep()，进度条执行一次步进。 Perform v.执行
