Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.ServiceProcess;
using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Hosting.WindowsServices;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace ravendemo
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var host = CreateWebHostBuilder(args).Build();
            var isService = args.Contains("--service");
            if (isService)
            {
                var baseDirectory = new FileInfo(Assembly.GetEntryAssembly().Location).Directory.FullName;
                Directory.SetCurrentDirectory(baseDirectory);
            }
            if (isService)
            {
                ServiceBase.Run(new WebHostService(host));
            }
            else
            {
                host.Run();
            }
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>();
    }
}