Implement Dot net watcher

Dot Net Watcher.

1. Set Up the .NET Core API

If you don’t already have an API project, create one:

dotnet new webapi -n FileWatcherApi 

cd FileWatcherApi

2. Add the FileSystemWatcher Implementation

  1. Open the project in your favorite editor (e.g., Visual Studio, VS Code).

  2. Create a new service class to manage file watching. For example:

    • Add a new folder named Services.
    • Create a file named FileWatcherService.cs.

  3. Implement the FileWatcherService:

using System;
using System.IO;

namespace FileWatcherApi.Services
{
    public class FileWatcherService
    {
        private readonly FileSystemWatcher _fileWatcher;

        public FileWatcherService(string pathToWatch)
        {
            if (!Directory.Exists(pathToWatch))
            {
                throw new DirectoryNotFoundException($"The directory '{pathToWatch}' does not exist.");
            }

            _fileWatcher = new FileSystemWatcher
            {
                Path = pathToWatch,
                NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite | NotifyFilters.CreationTime,
                Filter = "*.*" // Monitor all files
            };

            _fileWatcher.Created += OnFileCreated;
            _fileWatcher.Changed += OnFileChanged;
            _fileWatcher.Deleted += OnFileDeleted;
            _fileWatcher.Renamed += OnFileRenamed;
        }

        public void Start()
        {
            _fileWatcher.EnableRaisingEvents = true;
            Console.WriteLine("File watcher started...");
        }

        public void Stop()
        {
            _fileWatcher.EnableRaisingEvents = false;
            Console.WriteLine("File watcher stopped...");
        }

        private void OnFileCreated(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine($"File created: {e.FullPath}");
        }

        private void OnFileChanged(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine($"File changed: {e.FullPath}");
        }

        private void OnFileDeleted(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine($"File deleted: {e.FullPath}");
        }

        private void OnFileRenamed(object sender, RenamedEventArgs e)
        {
            Console.WriteLine($"File renamed from {e.OldFullPath} to {e.FullPath}");
        }
    }
}

3. Register the Service in Program.cs

Update Program.cs to register and start the FileWatcherService

using FileWatcherApi.Services;

var builder = WebApplication.CreateBuilder(args);

var app = builder.Build();

// Configure the FileWatcherService

var pathToWatch = @"C:\Path\To\Watch"; // Replace with your target directory

var fileWatcherService = new FileWatcherService(pathToWatch);

fileWatcherService.Start();

// Add cleanup on shutdown

app.Lifetime.ApplicationStopping.Register(() =>

{

    fileWatcherService.Stop();

});

// Map a simple endpoint to test the API

app.MapGet("/", () => "File Watcher API is running!");

app.Run();

4. Run the Application
Modify or create files in the directory specified by pathToWatch, and observe the logs in the console.

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