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Thread Safety - Any public static (Shared in VB) members of this class type are thread safe. Such multiple events can be correctly handled and processed by using a simple boolean flag check (for a first-come-first-serve approach) or by setting the FileSystemWatcher.NotifyFilter property to one of the NotifyFilters values.ģ. Moving a file is a complex operation that consists of multiple simple operations, therefore raising multiple events. For example, when a file is moved from one directory to another, several OnChanged and some OnCreated and OnDeleted events might be raised. Because FileSystemWatcher monitors the operating system activities, all events that applications fire will be picked up. Events being raised multiple times - In some cases a single event can generate multiple events that are handled by the component. To correct this problem, simply remove the explicit event handler (AddHandler.
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This is because, by default, the public events automatically call the respective protected methods (OnChanged, OnCreated, OnDeleted, OnRenamed). Events being raised twice - An event will be raised twice if an event handler (AddHander FSW.Created, AddressOf FSW_Created) is explicitly specified. Following are some tips and notes on how to use the FileSystemWatcher class to build a more robust solution:ġ. For example, a denial-of-service attack is possible if a malicious program gains access to a directory the FileSystemWatcher component is monitoring, and which thereby generates so many changes that the component cannot manage them and can cause a buffer overflow or other drastic effects. I've come to realize that it does need some understanding of this class to make it work efficiently. The component can watch files on a local computer, a network drive, or a remote computer. It listens to the file system change notifications and raises events when a directory, or file(s) in a directory, changes. The FileSystemWatcher class, for example, can be quite useful in application integration, by way of monitoring incoming data files and processing it once an event is raised.
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NET FileSystemWatcher class makes it possible to quickly and easily launch business processes when certain files or directories are created, modified, or deleted.