Timer优化实例

一个简单的Timer计时器,设置到达时间隔时启动一次Timer(每次只执行一次),更加节省资源...

1.首先新建一个控制台应用程序；

2.在Program.cs里面添加如下代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace Timer_TEST
{
    class Program
    {
        private System.Timers.Timer _timer;
        
        /// <summary>
        /// 下次统计时间
        /// </summary>
        DateTime _nextTime = Convert.ToDateTime(DateTime.Now.AddMinutes(1).ToString("yyyy-MM-dd HH:mm:ss"));

        /// <summary>
        /// 获取下次执行
        /// </summary>
        /// <param name="args"></param>
        double GetInterval()
        {
            double interval = Timeout.Infinite;

            try
            {
                TimeSpan ts = _nextTime.Subtract(DateTime.Now);
                interval = ts.Duration().TotalMilliseconds;
                Console.WriteLine(string.Format("{0}秒后执行",(interval/1000).ToString()));
            }
            catch (Exception ex)
            {
                Console.WriteLine("获取下次执行报表服务的时间间隔失败，错误信息：", ex);
            }
            return interval;
        }

        /// <summary>
        /// 启动定时器
        /// </summary>
        /// <param name="args"></param>
        public void Start()
        {
            try
            {
                _timer = new System.Timers.Timer();
                _timer.Enabled = true;
                _timer.Interval = GetInterval();
                _timer.AutoReset = false;//false为每次定时器只在间隔时间到达之后执行一次；true为定时器间隔时间到达后连续执行
                _timer.Elapsed += new System.Timers.ElapsedEventHandler(ShowTime);//设定定时器执行时间
                _timer.Start();
                Program p = new Program();
                p.ShowTime();

            }
            catch (Exception ex)
            {
                Console.WriteLine("定时器启动失败，失败信息：",ex);
            }
        }

        private void ShowTime(object sender, System.Timers.ElapsedEventArgs e)
        {
            ShowTime();
            //重新set定时器
            _timer.Interval = GetInterval();
            _timer.Start();
        }
        private void ShowTime()
        {
            //DateTime dt = Convert.ToDateTime(DateTime.Now.ToString("yyyy-mm-dd hh:mm:ss"));
            Console.WriteLine("现在时间是：" + DateTime.Now);
            _nextTime = _nextTime.AddMinutes(1);
        }

        static void Main(string[] args)
        {
            Program p = new Program();
            p.Start();
            Console.ReadLine();
        }
    }
}