C#Timer任务结束后再开启下次任务demo

该代码示例的核心是演示：让Timer只有本次任务执行完毕后才开始下次任务。

Timer示例代码

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

namespace TestTimer
{
    class Program
    {
        static System.Timers.Timer timer1 = new System.Timers.Timer();
        static void Main(string[] args)
        {

            timer1.AutoReset = true;
            timer1.Interval = 2000;
            timer1.Enabled = true;
            timer1.Elapsed += Timer1_Elapsed;

            while (true)
            {
                Thread.Sleep(5000);
                Console.WriteLine("运行中：" + Thread.CurrentThread.ManagedThreadId);
            }
        }

        private static void Timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            WriteLog.InserLogs("开始执行！");
           timer1.Enabled = false;
            myTask();
            timer1.Enabled = true;
            WriteLog.InserLogs("结束执行！");

        }

        public static void myTask()
        {

            Random random = new Random();
            int num = random.Next(1, 4);
            int sleepTime = 3000;
            if (num == 1)
            {
                sleepTime = 3000;
            }
            else if (num == 2)
            {
                sleepTime = 5000;
            }
            else if (num == 3)
            {
                sleepTime = 8000;
            }
            Thread.Sleep(sleepTime);
            WriteLog.InserLogs("耗时任务执行了。耗时：" + sleepTime);
        }
    }
}

日志代码：

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

namespace TestTimer
{
    public class WriteLog
    {
        /// <summary>
        /// 记录日志
        /// </summary>
        /// <param name="ErrorMsg"></param>
        public static void InserLogs(string ErrorMsg)
        {

            try
            {
                string LogPath = System.AppDomain.CurrentDomain.BaseDirectory + "\SystemLog\";
                if (!Directory.Exists(LogPath))
                {
                    Directory.CreateDirectory(LogPath);
                }
                using (StreamWriter sw = new StreamWriter(LogPath + DateTime.Now.ToString("yyyy-MM-dd") + ".txt", true, System.Text.Encoding.UTF8))
                {
                    sw.Write(DateTime.Now.ToString() + "：INFO----");
                    sw.WriteLine(ErrorMsg);
                    sw.WriteLine("---------------------------------------------
");
                    sw.Close();
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex.ToString());
            }
        }
    }
}

耗时任务的耗时是随机的，上次任务执行完毕才会执行下次任务。

执行日志：

2020/8/3 19:36:34：INFO----开始执行！
---------------------------------------------

2020/8/3 19:36:42：INFO----耗时任务执行了。耗时：8000
---------------------------------------------

2020/8/3 19:36:42：INFO----结束执行！
---------------------------------------------

2020/8/3 19:36:44：INFO----开始执行！
---------------------------------------------

2020/8/3 19:36:47：INFO----耗时任务执行了。耗时：3000
---------------------------------------------

2020/8/3 19:36:47：INFO----结束执行！
---------------------------------------------

2020/8/3 19:36:49：INFO----开始执行！
---------------------------------------------

2020/8/3 19:36:57：INFO----耗时任务执行了。耗时：8000
---------------------------------------------

2020/8/3 19:36:57：INFO----结束执行！
---------------------------------------------

2020/8/3 19:36:59：INFO----开始执行！
---------------------------------------------

2020/8/3 19:37:07：INFO----耗时任务执行了。耗时：8000
---------------------------------------------

2020/8/3 19:37:07：INFO----结束执行！
---------------------------------------------

2020/8/3 19:37:09：INFO----开始执行！
---------------------------------------------

2020/8/3 19:37:14：INFO----耗时任务执行了。耗时：5000
---------------------------------------------

2020/8/3 19:37:14：INFO----结束执行！
---------------------------------------------

2020/8/3 19:37:16：INFO----开始执行！