秒倒数计时器答案

【问题标题】：Seconds CountDown Timer秒倒数计时器
【发布时间】：2011-05-31 18:01:35
【问题描述】：

我有一个 int 值为 60 的 lblCountdown。我想让 lblCountDown 的 int 值随着秒数减少，直到它达到 0。

这是我目前所拥有的：

   private int counter = 60;
    private void button1_Click(object sender, EventArgs e)
    {
        int counter = 60;
        timer1 = new Timer();
        timer1.Tick += new EventHandler(timer1_Tick);
        timer1.Interval = 1000; // 1 second
        timer1.Start();
        label1.Text = counter.ToString();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        counter--;
        if (counter == 0)

            timer1.Stop();
            label1.Text = counter.ToString();

    }

【问题讨论】：

标签： c# string timer

【解决方案1】：

为此使用计时器

   private System.Windows.Forms.Timer timer1; 
   private int counter = 60;
   private void btnStart_Click_1(object sender, EventArgs e)
   {
        timer1 = new System.Windows.Forms.Timer();
        timer1.Tick += new EventHandler(timer1_Tick);
        timer1.Interval = 1000; // 1 second
        timer1.Start();
        lblCountDown.Text = counter.ToString();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        counter--;
        if (counter == 0)
            timer1.Stop();
        lblCountDown.Text = counter.ToString();
    }

【讨论】：

这个计时器不够准确。特别是在间隔会很低的情况下。但即使有 1 秒的间隔也会很糟糕。

【解决方案2】：

（2020 年 6 月 6 日更新，因为时间计算有问题）

用法：

CountDownTimer timer = new CountDownTimer();


//set to 30 mins
timer.SetTime(30,0);     

timer.Start();

//update label text
timer.TimeChanged += () => Label1.Text = timer.TimeLeftMsStr; 

// show messageBox on timer = 00:00.000
timer.CountDownFinished += () => MessageBox.Show("Timer finished the work!"); 

//timer step. By default is 1 second
timer.StepMs = 77; // for nice milliseconds time switch

当计时器对你没用时，别忘了Dispose();；

源代码：

using System;
using System.Diagnostics;
using System.Windows.Forms;

public class CountDownTimer : IDisposable
{
    public Stopwatch _stpWatch = new Stopwatch();

    public Action TimeChanged;
    public Action CountDownFinished;

    public bool IsRunnign => timer.Enabled;

    public int StepMs
    {
        get => timer.Interval;
        set => timer.Interval = value;
    }

    private Timer timer = new Timer();

    private TimeSpan _max = TimeSpan.FromMilliseconds(30000);

    public TimeSpan TimeLeft => (_max.TotalMilliseconds - _stpWatch.ElapsedMilliseconds) > 0 ? TimeSpan.FromMilliseconds(_max.TotalMilliseconds - _stpWatch.ElapsedMilliseconds) : TimeSpan.FromMilliseconds(0);
    
    private bool _mustStop => (_max.TotalMilliseconds - _stpWatch.ElapsedMilliseconds) < 0;

    public string TimeLeftStr => TimeLeft.ToString(@"\mm\:ss");

    public string TimeLeftMsStr => TimeLeft.ToString(@"mm\:ss\.fff");

    private void TimerTick(object sender, EventArgs e)
    {
        TimeChanged?.Invoke();

        if (_mustStop)
        {
            CountDownFinished?.Invoke();
            _stpWatch.Stop();
            timer.Enabled = false;
        }
    }

    public CountDownTimer(int min, int sec)
    {
        SetTime(min, sec);
        Init();
    }

    public CountDownTimer(TimeSpan ts)
    {
        SetTime(ts);
        Init();
    }

    public CountDownTimer()
    {
        Init();
    }

    private void Init()
    {
        StepMs = 1000;
        timer.Tick += new EventHandler(TimerTick);
    }

    public void SetTime(TimeSpan ts)
    {
        _max = ts;
        TimeChanged?.Invoke();
    }

    public void SetTime(int min, int sec = 0) => SetTime(TimeSpan.FromSeconds(min * 60 + sec));

    public void Start() {
        timer.Start();
        _stpWatch.Start();
    }

    public void Pause()
    {
        timer.Stop();
        _stpWatch.Stop();
    }

    public void Stop()
    {
        Reset();
        Pause();
    }

    public void Reset()
    {
        _stpWatch.Reset();
    }

    public void Restart()
    {
        _stpWatch.Reset();
        timer.Start();
    }

    public void Dispose() => timer.Dispose();
}

【讨论】：

【解决方案3】：

int segundo = 0;
DateTime dt = new DateTime();

private void timer1_Tick(object sender, EventArgs e){
    segundo++;
    label1.Text = dt.AddSeconds(segundo).ToString("HH:mm:ss");
}

【讨论】：

【解决方案4】：

这是我的解决方案，它可能对某人有所帮助。你需要一个标签和一个计时器。我在表单加载时写了它，因为我正在处理一个个人项目，但你可以通过将它放在一个按钮中来添加它的功能。

private void Form1_Load(object sender, EventArgs e){
        timer1.Interval = 1000;
        timer1.Start();
}

private void timer1_Tick(object sender, EventArgs e){
        if (int.Parse(label_time_left.Text) != 0){
            int futureText = int.Parse(label_time_left.Text) - 1;
            label_time_left.Text = futureText.ToString();
        } else {
            // actions when the timer ends 
        }
}

正如您所见，它的工作方式非常简单 :) 只是解析

【讨论】：

【解决方案5】：

嘿，请在您的项目中添加代码，这很简单，我认为可以解决您的问题。

    int count = 10;

    private void timer1_Tick(object sender, EventArgs e)
    {
        count--;
        if (count != 0 && count > 0)
        {
            label1.Text = count / 60 + ":" + ((count % 60) >= 10 ? (count % 60).ToString() : "0" + (count % 60));
        }
        else
        {
            label1.Text = "game over";

        }

    }

    private void Form1_Load(object sender, EventArgs e)
    {
        timer1 = new System.Windows.Forms.Timer();
        timer1.Interval = 1;

        timer1.Tick += new EventHandler(timer1_Tick);

    }

【讨论】：

【解决方案6】：

您需要一个公共类来初始化 Form1。

查看此代码：

namespace TimerApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private int counter = 60;
        private void button1_Click(object sender, EventArgs e)
        {
            //Insert your code from before
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            //Again insert your code
        }
    }
}

我试过了，一切正常

如果您需要更多帮助，请随时发表评论:)

【讨论】：