/// <summary> /// Adds and converts a card to the attachments list. /// </summary> /// <param name="attachments">A list of attachments.</param> /// <param name="card">The card.</param> public static void Add(this IList <Attachment> attachments, SigninCard card) { attachments.ThrowIfNull(nameof(attachments)); card.ThrowIfNull(nameof(card)); attachments.Add(card.ToAttachment()); }