fun with windows services

WindowsServiceDohickey.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Security.Principal;
using System.ServiceProcess;
using System.Text;
using Microsoft.Win32;
using NUnit.Framework;
using NUnit.Framework.Constraints;

namespace whereiswaldo
{

    public static class WindowsServiceDohickey
    {
        public static string GetImagePath(string serviceName)
        {
            string registryPath = @"SYSTEM\CurrentControlSet\Services\" + serviceName;
            RegistryKey keyHKLM = Registry.LocalMachine;

            RegistryKey key;
            key = RegistryKey.OpenRemoteBaseKey
                (RegistryHive.LocalMachine,Environment.MachineName).OpenSubKey(registryPath);

            string value = key.GetValue("ImagePath").ToString();
            key.Close();
            return ExpandEnvironmentVariables(value);
        }

        public static string GetInstallationDirectory(string serviceName)
        {
            return Path.GetDirectoryName(GetImagePath(serviceName));
        }

        private static string ExpandEnvironmentVariables(string path)
        {

            string systemRootKey = @"Software\Microsoft\Windows NT\CurrentVersion\";

            RegistryKey key = RegistryKey.OpenRemoteBaseKey
                (RegistryHive.LocalMachine, Environment.MachineName).OpenSubKey(systemRootKey);
            string expandedSystemRoot = key.GetValue("SystemRoot").ToString();
            key.Close();

            path = path.Replace("%SystemRoot%", expandedSystemRoot);
            return path;

        }
    }

    /// <summary>
/// Working with windows services
/// Stoping and starting has permissions issue
/// </summary>
/// 
/// 
    [TestFixture]
    public class describe_finding_the_location_of_a_windows_service
    {
        private const string _serviceName = "NetTcpPortSharing";

        [Test]
        public void get_service_path_from_registry()
        {
            Console.WriteLine(WindowsServiceDohickey.GetInstallationDirectory(_serviceName));
        }

        [Test]
        public void does_service_exist()
        {
            Assert.True(ServiceController.GetServices().Any(serviceController => serviceController.ServiceName == _serviceName));            
        }

        
        [Test]
        public void start_the_service()
        {
            try
            {
                // 
                /*****   this does not work becuase the app does not have the proper permission
                var service = ServiceController.GetServices().FirstOrDefault(serviceController => serviceController.ServiceName == _serviceName);
                service.Start();
                 */

                var service = ServiceController.GetServices().FirstOrDefault(serviceController => serviceController.ServiceName == _serviceName);
                service.Start();


            }
            catch(Exception ex)
            {
                Console.WriteLine( ex.Message);
            }
        }

        [Test]
        public void where_is_the_service_installed()
        {
            try
            {
                var service = ServiceController.GetServices().FirstOrDefault(serviceController => serviceController.ServiceName == _serviceName);
                Console.WriteLine(service.ToString());
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        [Test]
        public void stop_the_service()
        {
            try
            {
                var service = ServiceController.GetServices().FirstOrDefault(serviceController => serviceController.ServiceName == _serviceName);
                service.Stop();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        [Test]
        public void is_the_service_running()
        {
            try
            {
                var service = ServiceController.GetServices().FirstOrDefault(serviceController => serviceController.ServiceName == _serviceName);
                Console.WriteLine(string.Format("Service is {0}", service.Status.ToString()));

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }        
    }
}