Thursday, 4 November 2010

Using ‘FileSystemWatcher’ class to monitor file system changes

 

The ‘FileSystemWatcher’ class is very useful when it comes to monitor a file system path for changes such as create, update and delete of directories/files.

Create an object from the FileSystemWatcher class. (You need to add the ‘System.IO’ namespace)

FileSystemWatcher fileSystemWatcher = new FileSystemWatcher();






 






And set the following properties. For this example we will only consider about text files (.txt)




fileSystemWatcher.Filter = "*.txt";
fileSystemWatcher.Path = @"D:\";
fileSystemWatcher.EnableRaisingEvents = true;





 



And add the following event handlers and create events.




fileSystemWatcher.Created += new FileSystemEventHandler(fileSystemWatcher_Created);
fileSystemWatcher.Changed += new FileSystemEventHandler(fileSystemWatcher_Changed);
fileSystemWatcher.Deleted += new FileSystemEventHandler(fileSystemWatcher_Deleted);
fileSystemWatcher.Renamed += new RenamedEventHandler(fileSystemWatcher_Renamed);





And create the following events



 




static void fileSystemWatcher_Renamed(object sender, RenamedEventArgs e) {
Console.WriteLine("{0} - {1}",e.ChangeType,e.FullPath);
}

static void fileSystemWatcher_Deleted(object sender, FileSystemEventArgs e) {
Console.WriteLine("{0} - {1}", e.ChangeType, e.FullPath);
}

static void fileSystemWatcher_Changed(object sender, FileSystemEventArgs e) {
Console.WriteLine("{0} - {1}", e.ChangeType, e.FullPath);
}

static void fileSystemWatcher_Created(object sender, FileSystemEventArgs e) {
Console.WriteLine("{0} - {1}", e.ChangeType, e.FullPath);
}





 



Execute this and create, change, rename and delete a text file. And above mentioned events will be invoked.

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