File watcher utility

Please let other users know how useful this tip is by rating it below. Do you have a tip or code of your own you'd like to share? Submit it here.

.NET provides a hierarchical set of classes, developed preferably using C#, that provides all the services and APIs necessary for application development. API's for I/O, file system, data access, Remoting, etc., are a part of the Base Class Framework.

System.IO namespace is one of the class libraries in the base class framework that provides IO operation. This library also offers other services apart from basic IO operation. FileSystemWatcher is one of the members of IO library that gives us the access to system functionalities we could never have imagined, such as the FileWatcher utility. In this tip, I am going to demonstrate the FileWatcher utility, which will monitor a folder for creation of new files and raise an event if a new file is made. To get this sort of functionality in VB6 was a major pain as we had to place hooks and stuff. In .NET, it's become much simpler.

This sample code places a FileWatcher to monitor "C:" for creation of a new file. As soon as a new file is created, an event is raised in our application.

Imports System
Imports  System.IO
Class  Fw

  Shared Sub main()
    Dim fw As New
    fw.Path = "c:" ' Path to monitor 
    fw.IncludeSubdirectories = True
    fw.Filter = "*.*" 'additional filtering 

    'Add the event handler for creation of new files only 
   AddHandler fw.Created, New FileSystemEventHandler(AddressOf OnFileEvent)

   fw.EnableRaisingEvents = True 
   'Dont Exit 
  End Sub 

    'Event that will be raised when a new file is created 
    Shared Sub OnFileEvent(ByVal source As Object ,
ByVal  e As 
    console.writeline("New File Created in C: ")
   End Sub
End Class

Compile the file as Vbc fw.vb /r:system.io.dll /r:system.dll. Run the fw.exe and create a new file in "C:". You will notice a message on the console, "New file Created in "C:".

Source: DotNetExtreme.com

This was first published in July 2003

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.