CODEWITHSUNDEEP
c#.netfilesystemwatcher
Anirudha
Anirudha

Reputation: 32797

how can i enable filesystemwatcher to fire each and every file created event without loosing any

I want to collect the path of the files as soon as any file is created in a particular folder.

I used a List<string> and the FileSystemWatcher component. I add the paths to the List in the Created event, and everything works fine.

However, when there are many small files created, say around 2000, the Created event is fired only 1200 times. When I don't add the path to the list in the Created event, though, it is called for 2000 times. I tried using a separate thread, but to no avail.

How can I enable FileSystemWatcher to fire each and every event without missing some of the events?

Upvotes: 1

Views: 907

Answers (3)

Mark Avenius
Mark Avenius

Reputation: 13947

I have found, IIRC, that the FileSystemWatcher will not 'see' any new files while it is processing a given Created event. That is, while the Created event handler is processing, any new files created do not raise the event.

Have you tried making the processing faster (kick off an async thread, perhaps)? I know you mentioned a separate thread, but without code, it's hard to tell what that thread is doing or how it is used.

Upvotes: 1

Jason Meckley
Jason Meckley

Reputation: 7591

chances are it's a race condition and 2 files are added to the list at the same time. last write wins. locking the list before adding to the list would prevent this. If you are using .net 4.0 you could also use a concurrent dictionary or readwriteslim to assist with the concurrency issues.

Upvotes: 4

Hans Passant
Hans Passant

Reputation: 941495

Be sure to implement the Error event so you know when things go wrong. Keep the notification event handlers short and snappy, just add the file to a list and get out. Process the list in another worker thread. Increasing InternalBufferSize can help but should be avoided.

Upvotes: 3

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