FileSystemWatcher.NotifyFilter Property
Assembly: System (in system.dll)
/** @property */ public NotifyFilters get_NotifyFilter () /** @property */ public void set_NotifyFilter (NotifyFilters value)
public function get NotifyFilter () : NotifyFilters public function set NotifyFilter (value : NotifyFilters)
Property Value
One of the NotifyFilters values. The default is the bitwise OR combination of LastWrite, FileName, and DirectoryName.You can combine the members of the NotifyFilters enumeration to watch for more than one type of change at a time. For example, you can watch for changes in size of a file, and for changes in the LastWrite time. This raises an event anytime there is a change in file or folder size, or a change in the LastWrite time of the file or folder.
This is one way to filter out unwanted notifications. For more information on filtering out unwanted notifications, see the Filter, IncludeSubdirectories, and InternalBufferSize properties.
The following example creates a FileSystemWatcher to watch the directory specified at run time. The component is set to watch for changes in LastWrite and LastAccess time, the creation, deletion, or renaming of text files in the directory. If a file is changed, created, or deleted, the path to the file prints to the console. When a file is renamed, the old and new paths print to the console.
Use the System.Diagnostics and System.IO namespaces for this example.
public class Watcher { public static void Main() { Run(); } [PermissionSet(SecurityAction.Demand, Name="FullTrust")] public static void Run() { string[] args = System.Environment.GetCommandLineArgs(); // If a directory is not specified, exit program. if(args.Length != 2) { // Display the proper way to call the program. Console.WriteLine("Usage: Watcher.exe (directory)"); return; } // Create a new FileSystemWatcher and set its properties. FileSystemWatcher watcher = new FileSystemWatcher(); watcher.Path = args[1]; /* Watch for changes in LastAccess and LastWrite times, and the renaming of files or directories. */ watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName; // Only watch text files. watcher.Filter = "*.txt"; // Add event handlers. watcher.Changed += new FileSystemEventHandler(OnChanged); watcher.Created += new FileSystemEventHandler(OnChanged); watcher.Deleted += new FileSystemEventHandler(OnChanged); watcher.Renamed += new RenamedEventHandler(OnRenamed); // Begin watching. watcher.EnableRaisingEvents = true; // Wait for the user to quit the program. Console.WriteLine("Press \'q\' to quit the sample."); while(Console.Read()!='q'); } // Define the event handlers. private static void OnChanged(object source, FileSystemEventArgs e) { // Specify what is done when a file is changed, created, or deleted. Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType); } private static void OnRenamed(object source, RenamedEventArgs e) { // Specify what is done when a file is renamed. Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath); } }
public class Watcher
{
public static void main(String[] args1)
{
Run();
}
/** @attribute PermissionSet(SecurityAction.Demand, Name="FullTrust")
*/
public static void Run()
{
String args[] = System.Environment.GetCommandLineArgs();
// If a directory is not specified, exit program.
if (args.length != 2) {
// Display the proper way to call the program.
Console.WriteLine("Usage: Watcher.exe (directory)");
return;
}
// Create a new FileSystemWatcher and set its properties.
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.set_Path(args[1]);
/* Watch for changes in LastAccess and LastWrite times, and
the renaming of files or directories.
*/
watcher.set_NotifyFilter
(NotifyFilters.LastAccess |NotifyFilters.LastWrite |
NotifyFilters.FileName | NotifyFilters.DirectoryName);
// Only watch text files.
watcher.set_Filter("*.txt");
// Add event handlers.
watcher.add_Changed(new FileSystemEventHandler(OnChanged));
watcher.add_Created(new FileSystemEventHandler(OnChanged));
watcher.add_Deleted(new FileSystemEventHandler(OnChanged));
watcher.add_Renamed(new RenamedEventHandler(OnRenamed));
// Begin watching.
watcher.set_EnableRaisingEvents(true);
// Wait for the user to quit the program.
Console.WriteLine("Press \'q\' to quit the sample.");
while ((Console.Read() != 'q')) {
}
}
// Define the event handlers.
private static void OnChanged(Object source,FileSystemEventArgs e)
{
// Specify what is done when a file is changed, created, or deleted.
Console.WriteLine(("File: " + e.get_FullPath() + " "
+ e.get_ChangeType()));
} //OnChanged
private static void OnRenamed(Object source, RenamedEventArgs e)
{
// Specify what is done when a file is renamed.
Console.WriteLine("File: {0} renamed to {1}",
e.get_OldFullPath(),e.get_FullPath());
} //OnRenamed
} //Watcher
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
