/// <summary>
/// Filters FilePathCollection by filenames, in the order specified
/// </summary>
/// <param name="filePathCollection">the collection to filter</param>
/// <param name="fileNames">the file names to filter by</param>
/// <returns>the filtered list</returns>
public static IEnumerable <FilePath> Filter(this FilePathCollection filePathCollection, params string[] fileNames)
{
return
(fileNames
.Select(fileName => filePathCollection.SingleOrDefault(x => x.HasFileName(fileName)))
.Where(match => match != null)
.ToList());
}