// Утилитный метод, позволяющий получить массив рейтингов по массиву пользовательских id
 public double[] getRatingsForItemList(int[] userIds)
 {
     double[] ratings = new double[userIds.Length];
     for (int i = 0; i < userIds.Length; i++)
     {
         GeneralRating r = getUserRating(userIds[i]);
         if (r == null)
         {
             throw new Exception("Item doesn't have rating by specified user id (" +
                                 "userId=" + userIds[i] + ", itemId=" + getId());
         }
         ratings[i] = r.getRating();
     }
     return(ratings);
 }
 /*
  * Utility method to extract array of ratings based on array of item ids.
  */
 public double[] getRatingsForItemList(int[] itemIds)
 {
     double[] ratings = new double[itemIds.Count()];
     for (int i = 0, n = itemIds.Count(); i < n; i++)
     {
         GeneralRating r = getItemRating(itemIds[i]);
         if (r == null)
         {
             throw new Exception(
                       "User doesn't have specified item id (" +
                       "userId=" + UserId + ", itemId=" + itemIds[i]);
         }
         ratings[i] = r.getRating();
     }
     return(ratings);
 }