Multiple file-extensions searchPattern for System.IO.Directory.GetFiles

Question

What is the syntax for setting multiple file-extensions as searchPattern on Directory.GetFiles()? For example filtering out files

Answer 1

look like this demo:

void Main()
{
    foreach(var f in GetFilesToProcess("c:\\", new[] {".xml", ".txt"}))
        Debug.WriteLine(f);
}
private static IEnumerable GetFilesToProcess(string path, IEnumerable extensions)
{
   return Directory.GetFiles(path, "*.*")
       .Where(f => extensions.Contains(Path.GetExtension(f).ToLower()));
}