Given full path, check if path is subdirectory of some other path, or otherwise

Question

I have 2 strings - dir1 and dir2, and I need to check if one is sub-directory for other. I tried to go with Contains method:

dir1.contains(dir2);
         


        

Answer 1

My paths could possibly contain different casing and even have untrimmed segments... This seems to work:

public static bool IsParent(string fullPath, string base)
{
	var fullPathSegments = SegmentizePath(fullPath);
	var baseSegments = SegmentizePath(base);
	var index = 0;
	while (fullPathSegments.Count>index && baseSegments.Count>index && 
		fullPathSegments[index].Trim().ToLower() == baseSegments[index].Trim().ToLower())
		index++;
	return index==baseSegments.Count-1;
}

public static IList SegmentizePath(string path)
{
	var segments = new List();
	var remaining = new DirectoryInfo(path);
	while (null != remaining)
	{
		segments.Add(remaining.Name);
		remaining = remaining.Parent;
	}
	segments.Reverse();
	return segments;
}