Sample to get files with given extensions

GetFilesWithExtensions.cs

public static IEnumerable<FileInfo> GetFilesWithExtensions(string directory,
    bool recursive, params string[] extensions)
{
    return new FileSystemEnumerable<FileInfo>(
        directory,
        (ref FileSystemEntry entry) => (FileInfo)entry.ToFileSystemInfo(),
        new EnumerationOptions() { RecurseSubdirectories = recursive })
        {
            ShouldIncludePredicate = (ref FileSystemEntry entry) =>
            {
                if (entry.IsDirectory) return false;
                foreach (string extension in extensions)
                {
                    // This line is using multiple new span APIs- there are no allocations involved
                    if (Path.GetExtension(entry.FileName).SequenceEqual(extension))
                        return true;
                }
                return false;
            }
        };
}