¿Notificación cuando cambia un archivo?

Question

¿Hay algún mecanismo por el cual se me pueda notificar (en C#) cuando se modifica un archivo en el disco?

Answer 1

Eso sería System.IO.FileSystemWatcher.

Answer 2

Utilice FileSystemWatcher. Puede filtrar solo por eventos de modificación.

Answer 3

Puede usar la clase FileSystemWatcher.

public void CreateFileWatcher(string path) 
{ 
    // Create a new FileSystemWatcher and set its properties. 
    FileSystemWatcher watcher = new FileSystemWatcher(); 
    watcher.Path = path; 
    /* Watch for changes in LastAccess and LastWrite times, and 
     the renaming of files or directories. */ 
    watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite 
     | NotifyFilters.FileName | NotifyFilters.DirectoryName; 
    // Only watch text files. 
    watcher.Filter = "*.txt"; 

    // Add event handlers. 
    watcher.Changed += new FileSystemEventHandler(OnChanged); 
    watcher.Created += new FileSystemEventHandler(OnChanged); 
    watcher.Deleted += new FileSystemEventHandler(OnChanged); 
    watcher.Renamed += new RenamedEventHandler(OnRenamed); 

    // Begin watching. 
    watcher.EnableRaisingEvents = true; 
} 

// Define the event handlers. 
private static void OnChanged(object source, FileSystemEventArgs e) 
{ 
    // Specify what is done when a file is changed, created, or deleted. 
    Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType); 
} 

private static void OnRenamed(object source, RenamedEventArgs e) 
{ 
    // Specify what is done when a file is renamed. 
    Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath); 
}