How to check if directory 1 is a subdirectory of dir2 and vice versa

Question

What is an easy way to check if directory 1 is a subdirectory of directory 2 and vice versa?

I checked the Path and DirectoryInfo helperclasses but found no system-r

Answer 1

If you have two path then look at this:

Normalize directory names in C#

http://filedirectorypath.codeplex.com/ (I don't know the quality of it)

And use this:

var ancestor = new DirectoryPathAbsolute(ancestorPath);
var child = new DirectoryPathAbsolute(childPath);

var res = child.IsChildDirectoryOf(ancestor); //I don't think it actually checks for case-sensitive filesystems

Otherwise, if you want to know whether a directory exists as a subdirectory in a path take a look on:

Directory.EnumerateDirectories

Came in .Net 4.0. Example:

Does path contain a directory starting with Console:

//* is a wildcard. If you remove it, it search for directories called "Console"
var res = Directory.EnumerateDirectories(@path, "Console*", SearchOption.AllDirectories).Any();