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

I did a simple way for seach as many extensions as you need, and with no ToLower(), RegEx, foreach...

List myExtensions = new List() { ".aspx", ".ascx", ".cs" }; // You can add as many extensions as you want.
DirectoryInfo myFolder = new DirectoryInfo(@"C:\FolderFoo");
SearchOption option = SearchOption.TopDirectoryOnly; // Use SearchOption.AllDirectories for seach in all subfolders.
List myFiles = myFolder.EnumerateFiles("*.*", option)
    .Where(file => myExtensions
    .Any(e => String.Compare(file.Extension, e, CultureInfo.CurrentCulture, CompareOptions.IgnoreCase) == 0))
    .ToList();

Working on .Net Standard 2.0.