using System;
using System.ServiceProcess;
using System.IO;

namespace MyWindowsService
{
  public partial class MyService : ServiceBase
  {
    public MyService()
    {
      InitializeComponent();
    }

    string filePath = @"D:\MyServiceLog.txt";

    protected override void OnStart(string[] args)
    {
      using (FileStream stream = new FileStream(filePath,FileMode.Append))
      using (StreamWriter writer = new StreamWriter(stream))
      {
        writer.WriteLine($"{DateTime.Now},服務(wù)啟動！");
      }
    }

    protected override void OnStop()
    {
      using (FileStream stream = new FileStream(filePath, FileMode.Append))
      using (StreamWriter writer = new StreamWriter(stream))
      {
        writer.WriteLine($"{DateTime.Now},服務(wù)停止！");
      }
    }
  }
}

using System;
using System.Collections;
using System.Windows.Forms;
using System.ServiceProcess;
using System.Configuration.Install;

namespace WindowsServiceClient
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    string serviceFilePath = $"{Application.StartupPath}\\MyWindowsService.exe";
    string serviceName = "MyService";

    //事件：安裝服務(wù)
    private void button1_Click(object sender, EventArgs e)
    {
      if (this.IsServiceExisted(serviceName)) this.UninstallService(serviceName);
      this.InstallService(serviceFilePath);
    }

    //事件：啟動服務(wù)
    private void button2_Click(object sender, EventArgs e)
    {
      if (this.IsServiceExisted(serviceName)) this.ServiceStart(serviceName);
    }

    //事件：停止服務(wù)
    private void button4_Click(object sender, EventArgs e)
    {
      if (this.IsServiceExisted(serviceName)) this.ServiceStop(serviceName);
    }

    //事件：卸載服務(wù)
    private void button3_Click(object sender, EventArgs e)
    {
      if (this.IsServiceExisted(serviceName))
      {
        this.ServiceStop(serviceName);
        this.UninstallService(serviceFilePath);
      }
    }

    //判斷服務(wù)是否存在
    private bool IsServiceExisted(string serviceName)
    {
      ServiceController[] services = ServiceController.GetServices();
      foreach (ServiceController sc in services)
      {
        if (sc.ServiceName.ToLower() == serviceName.ToLower())
        {
          return true;
        }
      }
      return false;
    }

    //安裝服務(wù)
    private void InstallService(string serviceFilePath)
    {
      using (AssemblyInstaller installer = new AssemblyInstaller())
      {
        installer.UseNewContext = true;
        installer.Path = serviceFilePath;
        IDictionary savedState = new Hashtable();
        installer.Install(savedState);
        installer.Commit(savedState);
      }
    }

    //卸載服務(wù)
    private void UninstallService(string serviceFilePath)
    {
      using (AssemblyInstaller installer = new AssemblyInstaller())
      {
        installer.UseNewContext = true;
        installer.Path = serviceFilePath;
        installer.Uninstall(null);
      }
    }
    //啟動服務(wù)
    private void ServiceStart(string serviceName)
    {
      using (ServiceController control = new ServiceController(serviceName))
      {
        if (control.Status == ServiceControllerStatus.Stopped)
        {
          control.Start();
        }
      }
    }

    //停止服務(wù)
    private void ServiceStop(string serviceName)
    {
      using (ServiceController control = new ServiceController(serviceName))
      {
        if (control.Status == ServiceControllerStatus.Running)
        {
          control.Stop();
        }
      }
    }
  }
}