.NET Watcher in a .NET Core API

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.

Comments

Post a Comment

Popular posts from this blog

Ag Grid Angular

Image
  Creating a Basic Grid Angular An introduction to the key concepts of AG Grid. Overview  In this tutorial you will: Create a basic grid Load external data to grid Configure columns Configure grid features Format cell values Add custom component to cell Hook into grid events Once complete, you'll have an interactive grid, with custom components and formatted data - Try it out for yourself by  sorting ,  filtering ,  resizing ,  selecting , or  editing  data in the grid: Create a Basic Grid  Complete our  Quick Start  (or open the example below in CodeSandbox / Plunker) to start with a basic grid, comprised of: Row Data:  The data to be displayed. Column Definition:  Defines & controls grid columns. Grid Component:  The  ag-grid-angular  component, with Dimensions, Row Data, and Column Definition attributes import  {  Component  }  from   "@angular/core" ; import  {  AgG...
Read more

Power Shell UI Forms

 # Load the required assembly Add-Type -AssemblyName System.Windows.Forms # Create the main form $form = New-Object System.Windows.Forms.Form $form.Text = "Sample PowerShell GUI" $form.Size = New-Object System.Drawing.Size(300, 200) $form.StartPosition = "CenterScreen" # Create a label $label = New-Object System.Windows.Forms.Label $label.Text = "Enter your name:" $label.Location = New-Object System.Drawing.Point(10, 20) $label.Size = New-Object System.Drawing.Size(100, 20) $form.Controls.Add($label) # Create a text box $textBox = New-Object System.Windows.Forms.TextBox $textBox.Location = New-Object System.Drawing.Point(120, 20) $textBox.Size = New-Object System.Drawing.Size(150, 20) $form.Controls.Add($textBox) # Create a button $button = New-Object System.Windows.Forms.Button $button.Text = "Submit" $button.Location = New-Object System.Drawing.Point(10, 60) $button.Size = New-Object System.Drawing.Size(75, 30) $form.Controls.Add($button) # Add...
Read more