Which filter of FileSystemWatcher do I need to use for finding new files

c# filesystemwatcher
Bohn picture Bohn · Jun 17, 2012 · Viewed 19.2k times · Source

So far I know that FileSystemWatcher can look into a folder and if any of the files inside that folder is changed,modifies,.etc... then we can handle it. But I am not sure which filter and event I should use in my scenario: Watch for a Folder, If a file is added to that folder, do XYZ ... So In my scenario I don't care if an existing file is changed,etc..those should be ignored...only do XYZ if and only if a new file has been added to that Folder...

Which event and filter do you recommended for this scenario?

Answer

David Brabant picture David Brabant · Jun 17, 2012

Set up the watcher:

FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = "Blah";

watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
    | NotifyFilters.FileName;

watcher.Created += new FileSystemEventHandler(OnChanged);

watcher.EnableRaisingEvents = true;

Then implement the FileCreated delegate:

private void OnChanged(object source, FileSystemEventArgs e) {
    Console.WriteLine("File: " +  e.FullPath + " " + e.ChangeType);
}

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