CODEWITHSUNDEEP
c#monitorfilesystemwatcher
fpdragon
fpdragon

Reputation: 1927

C# file/folder monitor

I already managed to see file and folder changes with the FileSystemWatcher.

My problem is that I can't make a difference between files and folder. It's possible that a file and a folder have the same path names.

For the delete event I even can't use a dirty workarround with testing File.Exists(path) or Directory.Exists(path) because the file/folder is already deleted when the method is called.

Maybe this object has the info I need but I didn't found it:

FileSystemEventArgs e

I only want to know if the changed item was a file or a folder.

Upvotes: 4

Views: 2451

Answers (4)

fpdragon
fpdragon

Reputation: 1927

I've found a solution which is clean and always works:

The standard setting of a watcher is for files and folders. This makes no sense in my eyes since I can't find out which type the changed object had.

It's possible to create two filewatchers. One for files and one for folders. Then you just have to change the default settings as follows:

// for file
fileSysWatchFile.NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite;
// for folder
fileSysWatchDir.NotifyFilter = NotifyFilters.DirectoryName | NotifyFilters.LastWrite;

Upvotes: 1

Hans Olsson
Hans Olsson

Reputation: 54999

Assuming it's on a NTFS volume I think you could do what you need by looking at the Change Journals. Specifically the FSCTL_READ_USN_JOURNAL control code and looking at the FileAttributes of the USN_RECORD to see if it's a FILE_ATTRIBUTE_DIRECTORY.

You can find a sample here (in C++, but could possibly translate to C# or otherwise maybe just write a small C++ dll to call from your app): Walking a Buffer of Change Journal Records

Upvotes: 2

ThiefMaster
ThiefMaster

Reputation: 318468

It is not possible to retrieve the type of the deleted item unless you had a list of path->type mappings before where you can look up the last type of the deleted item.

Upvotes: 0

Darin Dimitrov
Darin Dimitrov

Reputation: 1038710

You could test whether it has the Directory attribute:

var attributes = File.GetAttributes(@"c:\somepath");
if ((attributes & FileAttributes.Directory) == FileAttributes.Directory)
{
    // it's a directory
}
else
{
    // it's a file
}

Of course if it has already been deleted this won't work and you won't be able to tell the type.

Upvotes: 1

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