Simple console application that supports graceful shutdown

Program.cs

using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;

namespace GracefulShutdownApplication
{
	public class Program
	{
		public static void Main(string[] args)
		{
			var processCancellationToken = new CancellationTokenSource();

			SetupShutdownWatcher(processCancellationToken);

			var task = Task.Factory.StartNew(token =>
			{
				while (true)
				{
					Console.WriteLine("Doing work");
					Thread.Sleep(1000);
					if (processCancellationToken.IsCancellationRequested)
					{
						Console.WriteLine("Task is being cancelled. Aborting job execution");
						break;
					}

					Console.WriteLine("Doing more work");
					Thread.Sleep(1000);
				}
			}, processCancellationToken);

			try
			{
				task.Wait(processCancellationToken.Token);
			}
			catch (OperationCanceledException)
			{
				Console.WriteLine("Task was cancelled, cleaning up");
				Thread.Sleep(3000);
				Console.WriteLine("Cleaned up");
			}
		}

		private static void SetupShutdownWatcher(CancellationTokenSource cancellationToken)
		{
			var shutdownFilePath = Environment.GetEnvironmentVariable("WORKER_SHUTDOWN_FILE");
			var directoryPath = Path.GetDirectoryName(shutdownFilePath);
			var fileSystemWatcher = new FileSystemWatcher(directoryPath);

			FileSystemEventHandler changed = (o, e) =>
			{
				if (e.FullPath.IndexOf(Path.GetFileName(shutdownFilePath), StringComparison.OrdinalIgnoreCase) >= 0)
				{
					Console.WriteLine("Shutdown file notification detected");
					cancellationToken.CancelAfter(1000);
				}
			};

			fileSystemWatcher.Created += changed;
			fileSystemWatcher.NotifyFilter = NotifyFilters.CreationTime | NotifyFilters.FileName | NotifyFilters.LastWrite;
			fileSystemWatcher.IncludeSubdirectories = false;
			fileSystemWatcher.EnableRaisingEvents = true;
		}
	}
}