Filesystemwatcher windows 8

This causes the component to lose track of changes in the directory, and it will only provide blanket notification. Increasing the size of the buffer with the InternalBufferSize property is expensive, as it comes from non-paged memory that cannot be swapped out to disk, so keep the buffer as small yet large enough to not miss any file change events. To avoid a buffer overflow, use the NotifyFilter and IncludeSubdirectories properties so you can filter out unwanted change notifications.

Please note the following when using the FileSystemWatcher class. In some systems, FileSystemWatcher reports changes to files using the short 8. For example, a change to "LongFileName. This class contains a link demand and an inheritance demand at the class level that applies to all members.

A SecurityException is thrown when either the immediate caller or the derived class does not have full-trust permission. For details about security demands, see Link Demands. The maximum size you can set for the InternalBufferSize property for monitoring a directory over the network is 64 KB. The operating system and FileSystemWatcher object interpret a cut-and-paste action or a move action as a rename action for a folder and its contents.

If you cut and paste a folder with files into a folder being watched, the FileSystemWatcher object reports only the folder as new, but not its contents because they are essentially only renamed. To be notified that the contents of folders have been moved or copied into a watched folder, provide OnChanged and OnRenamed event handler methods as suggested in the following table.

Note that several factors can affect which file system change events are raised, as described by the following:. Common file system operations might raise more than one event. For example, when a file is moved from one directory to another, several OnChanged and some OnCreated and OnDeleted events might be raised.

Moving a file is a complex operation that consists of multiple simple operations, therefore raising multiple events. Likewise, some applications for example, antivirus software might cause additional file system events that are detected by FileSystemWatcher.

The FileSystemWatcher can watch disks as long as they are not switched or removed. Remote computers must have one of the required platforms installed for the component to function properly. Note that a FileSystemWatcher may miss an event when the buffer size is exceeded.

To avoid missing events, follow these guidelines:. Increase the buffer size by setting the InternalBufferSize property. Avoid watching files with long file names, because a long file name contributes to filling up the buffer. Consider renaming these files using shorter names. Initializes a new instance of the FileSystemWatcher class. Initializes a new instance of the FileSystemWatcher class, given the specified directory to monitor. Initializes a new instance of the FileSystemWatcher class, given the specified directory and type of files to monitor.

This is the key to being able to concurrently monitor several folder locations and file extensions. Figure 3 shows the method that performs this key step.

Once this method executes, a list containing all the required FileSystemWatcher instances will be available, so the next step is to start the FileSystemWatcher class, which starts the listening process.

At this point, all the settings required for the several or at least one instances of the FileSystemWatcher are available in the list created in Figure 3. For this, I need to loop through the list and start the instances one-by-one. The code in Figure 4 shows how to perform the initialization process and how to assign all the parameters retrieved from the XML file.

In this code, the FileSystemWatcher is listening only for a creation event; however, other events are available, as well, such as Deleted and Renamed. I want to especially point to the line where a function subscribes to the FileSystemWatcher Created event. Permissions; using System. Security; using System. Globalization; using System.

LastWrite NotifyFilters. FileName NotifyFilters. Empty ; this. Machine ] [ ResourceConsumption ResourceScope. Exists path throw new ArgumentException SR. GetString SR. InvalidDirName, path ; this. Compare filter , value , StringComparison. SystemDesign, "System. SystemDrawing , TypeConverter "System. Asked 7 years, 8 months ago. Active 5 years, 3 months ago. Viewed times. Improve this question. Community Bot 1 1 1 silver badge.

Tono Nam Tono Nam It works but it does not raise an event when a file is modified. It only raises the event when a file is created or deleted. Or maybe I am doing something wrong — Tono Nam. FileSystemWatcher does not watch files. It watches directories. In particular, it tells you when the result of a "dir" has changed.

Files can change without affecting the output of "dir". Check these issues too if the problem persists: stackoverflow. Add a comment.