using System;
using System.IO;
using System.Timers;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //定时任务
            Timer timer = new Timer(3000);
            timer.Elapsed += new ElapsedEventHandler(Done);
            timer.AutoReset = true;
            timer.Enabled = true;
            
            Console.ReadKey();
        }

        static void Done(object source, ElapsedEventArgs e)
        {
            File.AppendAllText(@"C:\plan.txt", DateTime.Now.ToString() + "\r\n");
        }
    }

}