Windows Service에서 디비깅을 쉽게 하는 방법은 까다롭다. 실행프로그램을 배포해 놓고 Log를 작성해서 결과를 확인해야 하는 번거로움이 있다.
찾아 보면 아래의 참조와 같은 방법을 사용해도 되기는 하겠지만 간단한 방법을 검토 해보자

http://devsw.tistory.com/153
https://msdn.microsoft.com/ko-kr/library/cktt23yw.aspx
http://www.codeproject.com/Articles/10153/Debugging-Windows-Services-under-Visual-Studio-NET
http://blog.aliencube.org/ko/2014/04/30/developing-windows-service-with-topshelf/

이글에서 설명하는 방법은  Serviced의 Method를 호출하는 코드를 작성하여 Service를 제어하여 쉽게 Debugging하는 방법 이다.. 간단하게 아래와 같이 서비스 메서드를 호출 하여 동작을 확인하고 코드를 수정하면 된다.
그러나 이 방법은 실제 서비스 프로그램이 배포 되었을 때와 동작이 다르므로 배포후 확인은 별도로 해애한다 
MethodInfo onStartMethod = typeof(ServiceBase).GetMethod(“OnStart”,
BindingFlags.Instance | BindingFlags.NonPublic); 
onStartMethod?.Invoke(service, new object[] { new string[] { } });

Service Test를 위한 윈도우 폼을 하나 만든다음 서버스를 제어하는 코드를 추가한다.

그리고 버튼이벤트 및 생성자를 아래의 코드와 같이 작성한다. 
ServiceRunner.cs

namespace MyWinService
{
    public partial class ServiceRunner : Form
    {
        private readonly ServiceBase[] _theService;
        private readonly MethodInfo onStartMethod;
        private readonly MethodInfo onStopMethod;
        private readonly MethodInfo onPauseMethod;
        private readonly MethodInfo onContinueMethod;
        public ServiceRunner(ServiceBase[] servicesToRun)
        {           
            InitializeComponent();
            #region GetMethodInfo
            onStartMethod = typeof(ServiceBase).GetMethod("OnStart",
               BindingFlags.Instance | BindingFlags.NonPublic);

            onStopMethod = typeof(ServiceBase).GetMethod("OnStop",
               BindingFlags.Instance | BindingFlags.NonPublic);

            onPauseMethod = typeof(ServiceBase).GetMethod("OnPause",
               BindingFlags.Instance | BindingFlags.NonPublic);

            onContinueMethod = typeof(ServiceBase).GetMethod("OnContinue",
               BindingFlags.Instance | BindingFlags.NonPublic);
            _theService = servicesToRun;
            #endregion
            Show();
        }

        private void startButton_Click(object sender, EventArgs e)
        {        
            toolStripStatusLabel1.Text = "Started";
            foreach (ServiceBase service in _theService)
            {               
                onStartMethod?.Invoke(service, new object[] { new string[] { } });               
            }
        }
        private void pauseButton_Click(object sender, EventArgs e)
        {            
            toolStripStatusLabel1.Text = "Paused";
            foreach (ServiceBase service in _theService)
            {
                onPauseMethod?.Invoke(service, null);
            }
        }
        private void continueButton_Click(object sender, EventArgs e)
        {            
            toolStripStatusLabel1.Text = "Started";
            foreach (ServiceBase service in _theService)
            {
                onContinueMethod?.Invoke(service, null);
            }
        }
        private void stopButton_Click(object sender, EventArgs e)
        {           
            toolStripStatusLabel1.Text = "Stopped";
            foreach (ServiceBase service in _theService)
            {              
                onStopMethod?.Invoke(service, null);               
            }
        }
}

program.cs

namespace MyWinService
{
    static class Program
    {
        ///
        /// 해당 응용 프로그램의 주 진입점입니다.
        /// 
        static void Main(string[] args)
        {            
            ServiceBase[] ServicesToRun;
            ServicesToRun = new ServiceBase[]
            {
               new Service1()
            };
#if DEBUG
   System.Windows.Forms.Application.Run(new ServiceRunner(ServicesToRun));
#else
            ServiceBase.Run(ServicesToRun);
#endif
        }
    }
}

Service1.cs

namespace MyWinService
{
    partial class Service1 : ServiceBase
    {
        private System.Diagnostics.EventLog eventLog1;
        System.Timers.Timer timer = new System.Timers.Timer();
        public Service1()
        {
            InitializeComponent();
            this.eventLog1 = new System.Diagnostics.EventLog();
            if (!System.Diagnostics.EventLog.SourceExists("Test Source"))
            {
                System.Diagnostics.EventLog.CreateEventSource(
                    "Test Source", "MyNewLog");
            }
            eventLog1.Source = "Test Source";
            eventLog1.Log = "MyNewLog";
        }
        protected override void OnStart(string[] args)
        {
            eventLog1.WriteEntry("MyWinService Started", EventLogEntryType.Information);            
            timer.Interval = 20000; // 20 seconds
            timer.Elapsed += new System.Timers.ElapsedEventHandler(this.OnTimer);
            timer.Start();
        }

        protected override void OnPause()
        {
            timer.Stop();
            eventLog1.WriteEntry("MyWinService OnPause", EventLogEntryType.Information);
        }

        protected override void OnContinue()
        {
            timer.Start();
            eventLog1.WriteEntry("MyWinService OnContinue", EventLogEntryType.Information);
        }
        protected override void OnStop()
        {
            eventLog1.WriteEntry("MyWinService Stoped", EventLogEntryType.Information);
        }

        private void OnTimer(object sender, ElapsedEventArgs e)
        {
            string message = ServiceName + " is beeping "+ string.Format("{0:d/M/yyyy HH:mm:ss}", DateTime.Now);
            System.Media.SystemSounds.Exclamation.Play();
            eventLog1.WriteEntry(message, EventLogEntryType.Information);
        }        
    }
}

Try Icon 메뉴로 디버깅 만들기

Program.cs

static class Program
{
        ///
        /// 해당 응용 프로그램의 주 진입점입니다.
        /// 
        static void Main()
        {
            ServiceBase[] ServicesToRun;
            ServicesToRun = new ServiceBase[]
            {
                new ServiceProcess()
            };
#if DEBUG
            using (ServiceController pL = new ServiceController(ServicesToRun))
            {
                // Make sure the application runs!
                pL.Display();
                Application.Run();
            }
#else
            ServiceBase.Run(ServicesToRun);
#endif
}

ServiceController.cs 코드를 추가하여 메뉴와 동작을 추가한다

class ServiceController : IDisposable
{
   private readonly ServiceBase[] _theService;             
   NotifyIcon ni;
   public ServiceController(ServiceBase[] servicesToRun)
   {            
      _theService = servicesToRun;         
       ni = new NotifyIcon();
   }
  public void Dispose()
  {
      ni.Dispose();           
  }
  public ContextMenuStrip CreateContext()
  {
            // Add the default menu options.
            ContextMenuStrip menu = new ContextMenuStrip();
            ToolStripMenuItem item;
            ToolStripSeparator sep;

            item = new ToolStripMenuItem();
            item.Text = Properties.Resources.Start;
            item.Click += new EventHandler(Start);
            item.Image = Properties.Resources.CONGUIIMG;            
            menu.Items.Add(item);

            // pause.
            item = new ToolStripMenuItem();
            item.Text = Properties.Resources.Pause;
            item.Click += new EventHandler(Pause);
            item.Image = Properties.Resources.Pauseimg;
            menu.Items.Add(item);
            // restart.
            item = new ToolStripMenuItem();
            item.Text = Properties.Resources.Restart;
            item.Click += new EventHandler(Restart);
            item.Image = Properties.Resources.Restartimg;
            menu.Items.Add(item);

            // Windows Explorer.
            item = new ToolStripMenuItem();
            item.Text = Properties.Resources.Stop;
            item.Click += new EventHandler(Stop);
            item.Image = Properties.Resources.CONGUIOFFIMG;
            menu.Items.Add(item);            
            
            return menu;
 }
 /// Displays the icon in the system tray. 
 public void Display()
{
 // Put the icon in the system tray and allow it react to mouse clicks.//
  ni.MouseClick += new MouseEventHandler(ni_MouseClick);
  ni.Icon = Properties.Resources.CONGUI;
  ni.Text = "Launcher Application";
  ni.Visible = true;

  // Attach a context menu.
   ni.ContextMenuStrip = CreateContext();            
  }
  void Start(object sender, EventArgs e)
  {
          MethodInfo onStartMethod = typeof(ServiceBase).GetMethod("OnStart",
          BindingFlags.Instance | BindingFlags.NonPublic);

         foreach (ServiceBase service in _theService)
         {
           onStartMethod?.Invoke(service, new object[] { new string[] { } });
         }

          ToolStripMenuItem item = (ToolStripMenuItem)sender;

          item.Visible = false;
          ni.ContextMenuStrip.Items[1].Visible = true;
          ni.ContextMenuStrip.Items[0].Visible = true;
          ni.Icon = Properties.Resources.CONGUI;          
        }
void Restart(object sender, EventArgs e)
{
            MethodInfo onContinueMethod = typeof(ServiceBase).GetMethod("OnContinue",
                BindingFlags.Instance | BindingFlags.NonPublic);
            foreach (ServiceBase service in _theService)
            {
                onContinueMethod?.Invoke(service, null);
            }
}
void Pause(object sender, EventArgs e)
{
            MethodInfo onPauseMethod = typeof(ServiceBase).GetMethod("OnPause",
               BindingFlags.Instance | BindingFlags.NonPublic);
            foreach (ServiceBase service in _theService)
            {
                onPauseMethod?.Invoke(service, null);
            }

}
void Stop(object sender, EventArgs e)
{
            MethodInfo onStopMethod = typeof(ServiceBase).GetMethod("OnStop",
              BindingFlags.Instance | BindingFlags.NonPublic);
            foreach (ServiceBase service in _theService)
            {
                onStopMethod?.Invoke(service, null);
            }
        }

}