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

namespace TestTask
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        static void Main(string[] args)
        {
            //其中args就是任务计划中的可添加参数，多个参数使用空格分开。
            FileStream fs = new FileStream(@"d:\xx.txt", FileMode.OpenOrCreate, FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs);
            sw.BaseStream.Seek(0, SeekOrigin.End);
            foreach (var item in args)
            {
                sw.WriteLine("WindowsService(Thread): Write" + item + "\n");
            }
            sw.Flush();
            sw.Close();
            fs.Close();

            Class1 c = new Class1();
            //Thread thread = new Thread(c.OnStart);
            //thread.Start();
            c.OnStart();
            c.OnStop();
        }

    }
}

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

namespace TestTask
{
    public class Class1
    {
        public void OnStart()
        {
            //实现方法
            FileStream fs = new FileStream(@"d:\xx.txt", FileMode.OpenOrCreate, FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs);
            sw.BaseStream.Seek(0, SeekOrigin.End);
            sw.WriteLine("WindowsService(Thread): Service Started" + DateTime.Now.ToString() + "\n");

            sw.Flush();
            sw.Close();
            fs.Close();
        }

        public void OnStop()
        {
            // TODO: 在此处添加代码以执行停止服务所需的关闭操作。
            FileStream fs = new FileStream(@"d:\xx.txt", FileMode.OpenOrCreate, FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs);
            sw.BaseStream.Seek(0, SeekOrigin.End);
            sw.WriteLine("WindowsService(Thread): Service Stopped" + DateTime.Now.ToString() + "\n");
            sw.Flush();
            sw.Close();
            fs.Close();
        }
    }
}