gistfile1.txt

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static string sourceDir;
        static string targetDir;
        static string[] fileExtensions = new[] { ".dll", ".pdb" };

        static void Main(string[] args)
        {
            sourceDir = Path.GetFullPath(args.Length == 1 ? args[0] : @"c:\code\bin\Debug.AnyCPU\VSIntegration.Client") + Path.DirectorySeparatorChar;
            targetDir = Path.GetFullPath(args.Length == 2 ? args[1] : @"c:\Program Files (x86)\Microsoft Visual Studio\2019\main\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer") + Path.DirectorySeparatorChar;

            var watcher = new FileSystemWatcher(sourceDir);
            watcher.Created += Watcher_Changed;
            watcher.Changed += Watcher_Changed;
            watcher.IncludeSubdirectories = true;

            watcher.EnableRaisingEvents = true;

            while (true) Console.ReadKey();
        }

        private static void Watcher_Changed(object sender, FileSystemEventArgs e)
        {
            try
            {
                if (File.Exists(e.FullPath) && fileExtensions.Contains(Path.GetExtension(e.FullPath).ToLowerInvariant()))
                {
                    var targetFile = Path.Combine(targetDir, e.FullPath.Replace(sourceDir, string.Empty));

                    if (!Directory.Exists(Path.GetDirectoryName(targetFile)))
                        Directory.CreateDirectory(Path.GetDirectoryName(targetFile));

                    if (!File.Exists(targetFile) || File.GetLastWriteTime(targetFile) < File.GetLastWriteTime(e.FullPath))
                    {
                        Console.WriteLine($"Copying {e.FullPath} to {targetFile}...");
                        File.Copy(e.FullPath, targetFile, true);
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}