Set the properties for the FileSystemWatcher.įsWatch.Changed += new FileSystemEventHandler(LogFile) įsWatch.Created += new FileSystemEventHandler(LogFile) įsWatch.Deleted += new FileSystemEventHandler(LogFile) įsWatch.Renamed += new RenamedEventHandler(LogRename) įileSystemEventHandler(AddressOf LogFile) VB.NET Private fsWatch As FileSystemWatcher Name them anything you like, but keep in mind that my names may differ from yours.Īdd the following namespaces to your code. Two textboxes with their Text properties set.Once your form has loaded, design it to resemble Figure 1. Open Visual Studio 2019 and create either a new C# or VB.NET Windows Forms application. These changes could be things like file deletion, file renaming, changing the properties of a file, and so on. To put it better: It watches a folder for any changes. What Is FileSystemWatcher?Īs the name implies, it watches the system for files. Today, I would like to talk about using the FileSystemWatcher in. It will therefore be created within the class's code block.įileSystemWatcher appears in the System.IO namespace so ensure that you have using System.Welcome to my article. To allow this configuration, the object must have a variable scope that is visible to all of the form's methods. The object will be configured by form events when the path to monitor and the filtering options are changed, and when monitoring is enabled and disabled. To permit monitoring of file changes we need a FileSystemWatcher object. Permits filtering of the items that are monitored, based upon file and folder names. Logs all of the events that have occurred when a file or folder has been created, modified, deleted or renamed.Įnables and disables monitoring of the selected folder. Control NameĪllows the user to input the path to the folder that they wish to monitor for changes. After designing your form, it should look similar to the image beneath the table. You may wish to organise these controls into groups in the form and add descriptive labels. Rename the automatically generated form to "FileMonitorForm" and add the following controls. To begin, create a new Windows Forms project named "FileSystemMonitor". Whenever a change is made, it will be logged to a list box within the application's main form. This will be a simple application that monitors a folder for file changes. In this article we will create a new Windows Forms project to demonstrate the use of the FileSystemWatcher class. Raised when an existing file or folder is renamed. Raised when an existing file or folder is deleted. Raised when a new file or folder is created. Raised when a file or a folder is modified. The four events and the activities that they signify are: The FileSystemWatcher class provides four events that are raised to indicate a change to a file or folder. It achieves this by linking directly to the file system notifications provided by the Windows operating system and raising events when items change. This is an interesting class that provides all of the functionality required to monitor a directory on a disk and identify when its contents change. The FileSystemWatcher class is found in the System.IO namespace. Download Demo and Source Code FileSystemWatcher Class
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