关于使用线程的倒计时器的问题

[openzpc]

最近在学习C#，想做一个倒计时的小程序，但是使用Timer来完成，计时总是不太准确，我在晚上看到了这个帖子http://www.cnblogs.com/yinluhui0229/archive/2012/08/20/2648313.html
里面是使用线程来实现的，但是出现的情况是：毫秒的第一位是按照秒来变的（应该是十分之一秒），而“秒”那里是10秒跳一次，请问一下这是为什么？


Timecount 是总毫秒数 每次-1
Timecount -= 1;
线程挂起时间为1毫秒
Thread.Sleep(1);

我把这个程序上传了，如果看不懂我的描述的话，可以运行一下代码就看出来了。
http://download.csdn.net/detail/openzpc/5410551

谢谢！！！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace TimeThread
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        int Timecount = 0;//记录倒计时总毫秒数
        int isstop = 0;//标示是否启动/暂停的变量，0表示第一次初始化
        private void button1_Click(object sender, EventArgs e)
        {
            if (this.button1.Text == "开始计时" || this.button1.Text == "继续计时")
            {
                this.button1.Text = "暂停计时";
                if (isstop == 0)//第一次执行或者倒计时事件设置发生变化，则重新倒计时
                {
                    Timecount = Convert.ToInt32(txtTotalmm.Text) * 60000;//毫秒
                    Thread counter = new Thread(Counter);
                    counter.Start();
                    Control.CheckForIllegalCrossThreadCalls = false;//放弃捕获对错误线程的调用，否则在线程中无法调用控件名  
                    this.txtTotalmm.ReadOnly = true;
                    txthour.ForeColor = Color.Black;
                    txtmm.ForeColor = Color.Black;
                    txtss.ForeColor = Color.Black;
                    txtmss.ForeColor = Color.Black;
                }
                isstop = 1;//启动
            }
            else
            {
                this.button1.Text = "继续计时";
                //this.timer1.Stop();
                isstop = 2;//暂停
            }
        }
        public void Counter()
        {
            try
            {
                while (Timecount >= 0)
                {
                    this.txthour.Text = (Timecount / 3600000).ToString();
                    this.txtmm.Text = ((Timecount / 60000) % 60).ToString();
                    this.txtss.Text = ((Timecount / 1000) % 60).ToString();
                    this.txtmss.Text = (Timecount % 1000).ToString();
                    if (Timecount == 0)
                    {
                        txthour.ForeColor = Color.Red;
                        txtmm.ForeColor = Color.Red;
                        txtss.ForeColor = Color.Red;
                        txtmss.ForeColor = Color.Red;
                        this.txtTotalmm.ReadOnly = false;
                        this.button1.Text = "开始计时";
                        isstop = 0;
                        try
                        {
                            Thread currthread = Thread.CurrentThread;
                            currthread.Abort();// 终止当前进程，会触发ThreadAbortException异常，从而终止进程，所以下面需要捕获该异常才能终止进程
                        }
                        catch (ThreadAbortException) { }
                    }
                    if (isstop != 2)
                        Timecount -= 1;
                    Thread.Sleep(1);
                }
            }
            catch { }//处理异常关闭情况下的异常问题
        }

    }
}

[openzpc]

引用 3 楼 bindofn 的回复:

//调用API函数 [DllImport("kernel32.dll")] extern static short QueryPerformanceCounter(ref long x); [DllImport("kernel32.dll")] extern static short QueryPerformanceFrequency(ref long x); //定义延迟函数 public void delay(long delay_Time) { long stop_Value = 0; long start_Value = 0; long freq = 0; long n = 0; QueryPerformanceFrequency(ref freq); //获取CPU频率 long count = delay_Time * freq / 1000; QueryPerformanceCounter(ref start_Value); //获取初始前值 while (n < count) //不能精确判定 { QueryPerformanceCounter(ref stop_Value);//获取终止变量值 n = stop_Value - start_Value; } } Timecount -= 1; delay(1); 去掉赋值到文本框的时间浪费，这个精度是对的

谢谢了，我试一下

[只在此山中]

只是运行了线程,没有用计时器,可以用System.Threading.Timer,大概精度有20多ms,或者用api,精度更高. Thread.Sleep(1);并不一定休眠1ms,可能大很多. Timecount单位是ms,所以代码可改: this.txtss.Text = (Timecount / 1000).ToString(); this.txtmss.Text = Timecount.ToString();

[bindofn]

毫秒会有误差，用秒来倒数就没问题了

[bindofn]

//调用API函数 [DllImport("kernel32.dll")] extern static short QueryPerformanceCounter(ref long x); [DllImport("kernel32.dll")] extern static short QueryPerformanceFrequency(ref long x); //定义延迟函数 public void delay(long delay_Time) { long stop_Value = 0; long start_Value = 0; long freq = 0; long n = 0; QueryPerformanceFrequency(ref freq); //获取CPU频率 long count = delay_Time * freq / 1000; QueryPerformanceCounter(ref start_Value); //获取初始前值 while (n < count) //不能精确判定 { QueryPerformanceCounter(ref stop_Value);//获取终止变量值 n = stop_Value - start_Value; } } Timecount -= 1; delay(1); 去掉赋值到文本框的时间浪费，这个精度是对的