C# (CSharp) IAuctionDao примеры использования

Пример #1

 public AuctionsController(IAuctionDao auctionDao = null)
 {
     if (auctionDao == null)
     {
         dao = new AuctionDao();
     }
     else
     {
         dao = auctionDao;
     }
 }

Пример #2

 public AuctionsController(IAuctionDao auctionDao)
 {
     dao = auctionDao;
 }