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How to Monitor a Directory for Changes
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To monitor a directory for changes, follow this procedure: 1. Create a new FileSystemWatcher object, specifying the directory in the Path property. 2. Register for the Created and Deleted events. 3. Turn on events by setting EnableRaisingEvents to true. The following code snippet demonstrates this process:
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' VB Dim watcher As FileSystemWatcher = New FileSystemWatcher() watcher.Path = "c:\" ' Register for events AddHandler watcher.Created, _ New FileSystemEventHandler(AddressOf watcher_Changed) AddHandler watcher.Deleted, _ New FileSystemEventHandler(AddressOf watcher_Changed) ' Start Watching watcher.EnableRaisingEvents = True ' Event Handler Sub watcher_Changed(ByVal sender As Object, _ ByVal e As FileSystemEventArgs) Console.WriteLine("Directory changed({0}): {1}", _ e.ChangeType, _ e.FullPath) End Sub // C# FileSystemWatcher watcher = new FileSystemWatcher(); watcher.Path = @"c:\"; // Register for events watcher.Created += new FileSystemEventHandler(watcher_Changed); watcher.Deleted += new FileSystemEventHandler(watcher_Changed); // Start Watching watcher.EnableRaisingEvents = true; // Event Handler static void watcher_Changed(object sender, FileSystemEventArgs e)
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Lesson 1: Navigating the File System
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{ Console.WriteLine("Directory changed({0}): {1}", e.ChangeType, e.FullPath); }
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The event handler simply reports each change found in the FileSystemEventArgs object that is sent to the event handler. In addition to using the Added and Changed events, you can monitor the system for renamed files. To monitor a directory for renamed files, you can follow this procedure: 1. Create a new FileSystemWatcher object, specifying the directory in the Path property. 2. Register for the Renamed event. 3. Turn on events by setting EnableRaisingEvents to true. The following code snippet demonstrates this process:
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' VB Dim watcher As FileSystemWatcher = New FileSystemWatcher() watcher.Path = "c:\" ' Register for events AddHandler watcher.Renamed, _ New RenameEventHandler(AddressOf watcher_Renamed) ' Start Watching watcher.EnableRaisingEvents = True ' Event Handler Sub watcher_Renamed(ByVal sender As Object, _ ByVal e As RenamedEventArgs) Console.WriteLine("Renamed from {0} to {1}", _ e.OldFullPath, _ e.FullPath) End Sub // C# FileSystemWatcher watcher = new FileSystemWatcher(); watcher.Path = @"c:\"; // Register for events watcher.Renamed += new RenamedEventHandler(watcher_Renamed); // Start Watching watcher.EnableRaisingEvents = true;
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// Event Handler static void watcher_Renamed(object sender, RenamedEventArgs e) { Console.WriteLine("Renamed from {0} to {1}", e.OldFullPath, e.FullPath); }
When watching the file system, you can get more changes than the FileSystemWatcher can handle. When too many events occur, the FileSystemWatcher throws the Error event. To capture the Error event, follow these steps: 1. Create a new FileSystemWatcher object, specifying the directory in the Path property. 2. Register for the Error event. 3. Turn on events by setting EnableRaisingEvents to true. The following code snippet demonstrates this process:
' VB Dim watcher As FileSystemWatcher = New FileSystemWatcher() watcher.Path = "c:\" ' Register for events AddHandler watcher.Error, _ New ErrorEventHandler(AddressOf watcher_Error) ' Start Watching watcher.EnableRaisingEvents = True ' Event Handler Sub watcher_Error(ByVal sender As Object, _ ByVal e As ErrorEventArgs) Console.WriteLine("Error: {0}", _ e.GetException()) End Sub // C# FileSystemWatcher watcher = new FileSystemWatcher(); watcher.Path = @"c:\"; // Register for events watcher.Error += new ErrorEventHandler(watcher_Error); // Start Watching watcher.EnableRaisingEvents = true;
Lesson 1: Navigating the File System
// Event Handler static void watcher_Error(object sender, ErrorEventArgs e) { Console.WriteLine("Error: {0}", e.GetException()); }
Lab: Enumerate Files and Watch for Changes
In this lab, you will enumerate through the files of a folder and then watch to see whether any files have changed. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder.
Exercise 1: Enumerating Through the Files in a Folder
In this exercise, you will enumerate through all the files in a particular drive. 1. Create a new console application named ShowFilesDemo. 2. Add an Import (or an include in C#) for the System.IO namespace into the new project. 3. Add a new method that takes a DirectoryInfo object named ShowDirectory. 4. Within your new method, iterate through each of the files in your directory and show them in the console one at a time. Your code might look something like this:
' VB Sub ShowDirectory(ByVal dir As DirectoryInfo) ' Show Each File Dim file As FileInfo For Each file In dir.GetFiles() Console.WriteLine("File: {0}", file.FullName) Next End Sub // C# static void ShowDirectory(DirectoryInfo dir) { // Show Each File foreach (FileInfo file in dir.GetFiles()) { Console.WriteLine("File: {0}", file.FullName); } }
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