Display the proper way to call the programĬonsole.WriteLine("Usage: Watcher.exe \"directory\" \"filter\"") įileProcessor fileProcessor = new FileProcessor() įileSystemWatcher fileSystemWatcher1 = new FileSystemWatcher() įileSystemWatcher1.IncludeSubdirectories = false įileSystemWatcher1.Created = new System.IO.FileSystemEventHandler(this.fileSystemWatcher1_Created) įileSystemWatcher1.EnableRaisingEvents = true Ĭonsole.WriteLine("Press \'q\' to quit the program.") įileSystemWatcher1. If a directory and filter are not specified, exit program The processing thread could take as much time as it needs to process the file.Ī queue is used for forwarding file path from event handler thread to the processing thread. When file is changed and it is detected by FileSystemWatcher, appropriate event handler should only read its path, forward it to file processing thread and close itself so FileSystemWatcher can detect another file change and use the same event handler. Since file processing might take some time and creation of other files might get undetected by FileSystemWatcher, file processing should be separated from file change detection and file change detection should be so short that it never misses single file change.įile handling can be divided into two threads: one for the file change detection and the other for the file processing. Thats probably throwing an exception in the thread-pool thread, which is bringing down the process. So, the second file is missed by FileSystemWatcher. Assuming Text is trying to change a UI property, youre changing the UI from the wrong thread.FileSystemWatcher raises events on thread-pool threads, but youre only meant to access the UI from the UI thread. It cannot handle creation event of second file. Since FileSystemWatcher’s event handler is processing the first file, ![]() The processing of the file might take some time.ĭuring that time another file might be created in watched folder. The event handler might unzip the file, read its content to decide how to process it further, write record of it in database log table and move the file to another folder. file is created), the FileSystemWatcher raises the appropriate event. Read all posts dedicated to file I/O here.FileSystemWatcher를 사용하다 보면 이벤트가 누락되는 경우가 많다.įileSystemWatcher is watching for changes happening in some folder. In the below example I’ve updated the security settings of a file and it successfully raised the Changed event: Then we subscribe to the generic Changed event which is raised in case an existing file changes. Here we want to be notified if either the file size changes or the security properties have been updated. With NotifyFilter we can further refine the cases when we want to be notified of a file change. We also specify that we want to monitor all subfolders of the “Path” directory through the IncludeSubdirectories property. Here we’re interested in text files only. We can filter the file names to be monitored. We set the path to be monitored as usual. Static void watcher_Deleted(object sender, FileSystemEventArgs e)Ĭonsole.WriteLine("File deleted. “c:\myfolder” – especially if it’s editable by your colleagues – then FileSystemWatcher is a good candidate.Ĭonsider the following Console application:įileSystemWatcher watcher = new FileSystemWatcher() ![]() So if you’d like to make sure you’re notified if a change occurs on e.g. This can be any directory, such as “c:\” or any subdirectory under the C: drive. In this post we’ll look at how you can use the FileSystemWatcher object to monitor the Windows file system for various changes.Ī FileSystemWatcher object enables you to be notified when some change occurs in the selected part of the file system.
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