定时器进度条制作

namespace _定时器制作
{
    public partial class Form1 : Form
    {
        //日志输出方法
        public void outlog(string str)
        {
            textBox2.AppendText(DateTime.Now.ToString()+str+"\n");
        }
        public Form1()
        {
            InitializeComponent();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if ((progressBar1.Value == 0) && (textBox1.Text == "")) //(progressBar1.Value == 0)
            {
                outlog("请设定总时间");
                System.Threading.Thread.Sleep(1000);               
                timer1.Stop();
            }
            //progressBar1.PerformStep();//设置执行进度，自动增长step
            else if (progressBar1.Value > progressBar1.Minimum)
            {
                progressBar1.PerformStep();
                //outlog("进度条正在工作,已经完成"+(1-Convert.ToDouble(progressBar1.Value)/Convert.ToDouble(progressBar1.Maximum)));
                outlog("进度条正在工作,已经完成" + Convert.ToInt32((1 - Convert.ToDouble(progressBar1.Value) / Convert.ToDouble(progressBar1.Maximum)) * 100).ToString() + "%");
                //(最大值-当前值)/最大值=进度百分比（完成进度）即：(1-当前值/最大值)=进度百分比
            }
            else
            {
                timer1.Stop();
                outlog("已经完成倒计时");
                button2.Enabled = false;
                button3.Enabled = false;
            }  
        }
        private void Form1_Load(object sender, EventArgs e)
        {   
            // if ((progressBar1.Value == 0) && (textBox1.Text == "")) //(progressBar1.Value == 0)
            //{
            //    outlog("请设定总时间");
            //    System.Threading.Thread.Sleep(1000);
            //    System.Threading.Thread.Sleep(1000);
            //}        
            //开始，停止，暂停三个button在启动时是灰色，不可见，设定时间button可见
            button1.Enabled = false;
            button2.Enabled = false;
            button3.Enabled = false;
            //progressBar1.Value = 50;//设置显示进度
            //设置maximum和minimum，设置step
            //progressBar1.Increment(20);//progress对象.increment(进度值)
        }
        private void button4_Click(object sender, EventArgs e)
        {
            //设定时间click时间时，进度条初始化，开始button不可见
            try
            {
                if (textBox1.Text.Trim() != "")
                {
                    progressBar1.Minimum = 0;
                    //progressBar1.Maximum = 100;
                    progressBar1.Maximum = Convert.ToInt32(textBox1.Text);
                    progressBar1.Step = -1;
                    progressBar1.Value = progressBar1.Maximum;//定时器倒计时，所以开始时进度是满的
                    button1.Enabled =true;//点击设定时间之后，设定时间button不可见，开始button可见
                    button4.Enabled = false;
                    //textBox2.AppendText(DateTime.Now.ToString()+"时间正确设置，请按开始键继续\n");
                    outlog("时间设置正确，请按开始键继续。。。。。。");
                }
            }
            catch
            {
                MessageBox.Show("请输入正确的秒数（必须是整数）");
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            button2.Enabled = true;
            button3.Enabled = true;
            timer1.Start();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            if (timer1.Enabled == true)
            {
                outlog("进度已经被暂停");
                button2.Text = "继续";
                timer1.Stop();
            }
            else
            {
                outlog("进度条继续工作");
                button2.Text = "暂停";
                timer1.Start();
            }
        }
        private void button3_Click(object sender, EventArgs e)
        {
            outlog("进度条停止工作\n=====================================");
            timer1.Stop();
            timer1.Enabled = false;
            progressBar1.Value = 0;
            button4.Enabled = true;
            button1.Enabled = false;
            button2.Enabled = false;
            button3.Enabled = false;
            button2.Text = "暂停";         
        }
    }
}