Dictionary与SortedDictionary

        //按照某个字段排序
        public List<Card>  SortByCardItem(List<Card> cards,string itemName,SortOrder sortOrder)
        {
            List<Card> returnList = new List<Card>();
            SortedDictionary<string, Card> sd = new SortedDictionary<string, Card>();
            for (int i = 0; i < cards.Count; i++)
            {
                var v = cards[i].CardItems.Find(c => c.Name.Equals(itemName));
                if(v==null)//说明不存在某个字段
                {
                    return cards;
                }
                sd.Add(v.Value, cards[i]);
            }
                
            if (sortOrder==SortOrder.Ascending)//升序
            {
                foreach (var item in sd)
                {
                    returnList.Add(item.Value);
                }
            }
            else//降序
            {
                foreach (var item in sd.Reverse())
                {
                    returnList.Add(item.Value);
                }
            }
            return returnList;

        }