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

GetFiles can only match a single pattern, but you can use Linq to invoke GetFiles with multiple patterns:

FileInfo[] fi = new string[]{"*.txt","*.doc"}
    .SelectMany(i => di.GetFiles(i, SearchOption.AllDirectories))
    .ToArray();

See comments section here: http://www.codeproject.com/KB/aspnet/NET_DirectoryInfo.aspx