Question

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How can I perform full recursive directory & file scan?

I can’t find any informations, how to create a full directory listing in C#, including all files inside and all its subfolders’s files, i.e:

c:\a.jpg
c:\b.php
c:\c\d.exe
c:\e\f.png
c:\g\h.mpg

Answer 1

You can use DirectoryInfo.GetFiles(“C:\*.*”, SearchOption.AllDirectories);

This will return an array of FileInfo objects, which include a Name and FullName property for the filename.

That being said, I would not do this on “C:\”, as you’ll return a huge array, but this technique will work correctly on an appropriate folder.

If you’re using .NET 4, I’d recommend using EnumerateFiles instead, which will return an IEnumerable<T> instead of an array.

Note that the above code will most likely fail, however, as it requires full permissions to search the file system. A SecurityException will be raised if you can’t access specific parts of the file system you’re trying to search.

Also – if you’re only interested in the file names and not the full FileInfo information, you can use Directory.EnumerateFiles instead, which returns an IEnumerable<string> with all of the relevant filenames.