![]() Offers a new event All reporting all FSW events.Gets enabled when subscribing to events Existed or All Offers sorting events by oldest (existing) file first.Existing files are reported before any ones detected by NTFS events. Offers reporting existing files via a new event Existed.Must be set before EnableRaisingEvents=True! Supports limiting the BlockingCollection.BoundedCapacity via the EventQueueSize property.It is better to buffer in a BlockingCollection than consuming precious non-paged memory by increasing InternalBufferSize. Buffers FSW events in a BlockingCollection.My BufferingFileSystemWatcher wraps the standard FSW: NET 4.5 and C# 6.0 finally supporting exception filters (VB.NET always had this feature) it is now easy to handle typical exceptions like FileNotFound, FileInUse or NetworkNameNoLongerAvailable. ![]() ![]() With IOException.HResult no longer being protected since. Thus one should rely on exceptions instead. Here if/then constructs are not robust because changes can happen in between. When working with files this is typically done in a situation where producers and consumers work concurrently. Robust File Operationsįor file operations one should consider using those from the Microsoft.VisualBasic namespace because they are more robust than those in System.IO and offer more features like automatically overwriting existing files. The FSW minimizes usage of precious non-paged memory via its InternalBufferSize property and throws an InternalBufferOverflowException „Too many changes at once in directory …“when exceeded. Maybe not discovering the need to implement an OnError handler and being misled by the FSW throwing exception until started is the reason for the wrongly perceived bad reliability of the FSW. Strangely this so important FSW Error event does not show up in the Win Forms designer, my wrappers fix this. To prevent exceptions going unnoticed one must handle the Error event. This is typical for the Event-based Asynchronous Pattern (EAP). While watching for changes the FSW reports exceptions via its Error event only and does does not raise them. The FSW only throws exceptions on problems when setting its properties. An easy way to create lots of files and file system events is repeatedly copying and pasting all files in a directory via CTRL+A, CTRL-C, CTRL-V. Your watcher now only needs to watch for a single renamed event per file. NET applications a file rename is an atomic operation. If you have control over the file producer you can easily tame this event flood by renaming the files to the watched directory or watched extension only when they are totally complete. xlsx file and triggers 8 events for 3 different files of which none is changed event for the file changed one would naively expect:įile system event flood triggered by Excel for single actions like „Save“ Ex: Excel triggers 15 NTFS events for 4 different files when creating a single new. ![]() Some applications trigger lots of file system events for a single action.
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