========install.bat
set serviceName=你的服务名称
set serviceFilePath=C:\CoreDemo\WorkerService\bin\Debug\netcoreapp3.0\MyWorkerService.exe
set serviceDescription=服务描述

sc create 你的服务名称  BinPath=C:\CoreDemo\WorkerService\bin\Debug\netcoreapp3.0\MyWorkerService.exe
sc config 你的服务名称   start=auto  
sc description 你的服务名称  服务描述信息
sc start  你的服务名称
pause

========unstall.bat
set serviceName=你的服务名称
sc stop   你的服务名称
sc delete 你的服务名称
pause

=======================
 创建服务
>sc create 你的服务名称  BinPath=C:\CoreDemo\WorkerService\bin\Debug\netcoreapp3.0\MyWorkerService.exe

 启动服务
>sc start 你的服务名称

 停止服务
>sc stop 你的服务名称

 删除服务
>sc delete 你的服务名称

 添加服务描述

>sc description 你的服务名称 "描述" 

>sc description mylogservice "mylog日志服务" ## 改变服务的启动方式 手动/自动/禁用 sc config 你的服务名称 start= demand/auto/disabled

1导包：
    /*
       <ItemGroup>
          <PackageReference Include="Microsoft.Extensions.Hosting" Version="5.0.0" />
          <PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices" Version="5.0.1" />
       </ItemGroup>
     */
     

2 Program code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace NetCore_Windows服务
{
    using Microsoft.Extensions.DependencyInjection;
    using Microsoft.Extensions.Hosting;
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureServices((hostContext, services) =>
                {
                    services.AddHostedService<Worker>();
                }).UseWindowsService();
    }
}



// 3 Worker 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace NetCore_Windows服务
{
    using System.IO;
    public class Worker : BackgroundService
    {
        private readonly ILogger<Worker> _logger;

        public Worker(ILogger<Worker> logger)
        {
            _logger = logger;
            string newPath = GetLogFilePath();
            if (!File.Exists(newPath))
            {
                var filrStream = File.Create(newPath);
                filrStream.Close();
            }
        }
        public override  Task StartAsync(CancellationToken cancellationToken)
        {
            string newPath = GetLogFilePath();
            File.AppendAllLines(newPath, new List<string> { $"=======StartAsync:{DateTime.Now}" });
            return base.StartAsync(cancellationToken);
        }

        private static string GetLogFilePath()
        {
            var curentDurectory = AppDomain.CurrentDomain.BaseDirectory;
            string newPath = curentDurectory + "/Logs/1.txt";
            return newPath;
        }

        public override Task StopAsync(CancellationToken cancellationToken)
        {
            string newPath = GetLogFilePath();
            File.AppendAllLines(newPath, new List<string> { $"=======StopAsync:{DateTime.Now}" });
            return base.StopAsync(cancellationToken);
        }
        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            while (!stoppingToken.IsCancellationRequested)
            {
                _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
                string newPath = GetLogFilePath(); ;
                File.AppendAllLines(newPath, new List<string> { $"=======Work现在时间是:{DateTime.Now}=======" });
                await Task.Delay(3000, stoppingToken);
            }
        }
    }
}