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User999999
User999999

Reputation: 2520

Count the number of files in folder (the fastest way)

I've got a problem counting the files on a fileshare (which are present longer than 1 hour):

The two 'known' methods:

GetFiles

dir.Getfiles.Where(Function(x) x.CreationTime < DateTime.Now.AddHours(-1)).Count()

Link: GetFiles

EnumerateFiles

dir.EnumerateFiles.Where(Function(x) x.CreationTime < DateTime.Now.AddHours(-1)).Count()

Link: EnumerateFiles

Is there any faster method to count the number of files inside a folder/fileshare?

The number of files may vary from 2000 to upwards of 500 000. Both methods shown above show a drastic drop in performance beyond the 30 000 files.

Questions found on SO that didn't resolve it for me:

fastest-way-to-count-folder-files-in-net-4-0

how-to-correctly-count-the-number-of-files-in-a-folder

Upvotes: 1

Views: 1622

Answers (1)

paparazzo
paparazzo

Reputation: 45096

Another option is:

FileSystemWatcher Class

Track add and delete.
Add and remove from a collection.

I would assume DirectoryInfo.EnumerateFiles would be faster.
For two reasons:
One it enumerates before the whole collection returns
Two it includes date. Getfiles only returns the name so it may be making a second trip to get the date.

DirectoryInfo Methods

Upvotes: 1

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