watcher.NotifyFilter line if it can't get the path. We need to create new version of the object because the First, create the main FileSystemWatcher component in the Service1.cs file. We can now set up our code, controls and properties for the actual service.
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MessageBox.Show("A FileSystemWatcher error has occurred: " XML Copy CodePrivate static void WatcherError(object source, ErrorEventArgs e)Įxception watchException = e.GetException() Private static void NewFile(object source, FileSystemEventArgs e)Ĭonsole.WriteLine("A file has been found!") Unzip the attach file and you will have a cu file and a. Watcher.Error += new ErrorEventHandler(WatcherError) Watcher.Changed += new FileSystemEventHandler(NewFile) is created, and 1 for when it detects an error. Add event handlers: 1 for the event raised when a file Watcher.NotifyFilter = NotifyFilters.LastWrite Watcher.Path = For this example, I only care about when new files are Private static FileSystemWatcher watcher = You can even test this on your local machine by simply removing the directory that is being searched: using System I soon learnt that, when this happens, the FileSystemWatcher loses track of what it was supposed to do.Įasy to fix? Well, it’s not too hard. FILEWATCHER.COM - Domain Information: Domain: FILEWATCHER. You see, the watcher was looking at a network drive, and intermittently (as networks will) it was dropping out and then coming back again. After a little searching, I managed to narrow it down to network outages. 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.An application I was working on that used the FileSystemWatcher class and was intended to run 24/7 would periodically stop working. 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.
In the web method I am checking for the existence of certain files which is in itself contained in a while (true) loop. You may wish to organise these controls into groups in the form and add descriptive labels. I have a client that invokes a web method. Rename the automatically generated form to "FileMonitorForm" and add the following controls.
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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. When an available file is found the task completes. The FileSystemWatcher class is found in the System.IO namespace. The File Watcher Task does what it says really, it watches a folder waiting for files.
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Download Demo and Source Code FileSystemWatcher Class
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