集合访问的方法比较

1.索引符

public class Animals:CollectionBase
    {
        public void Add(Animal newAnimal)
        {
            List.Add(newAnimal);
        }

        public void Remove(Animal newAnimal)
        {
            List.Remove(newAnimal);
        }
        
        
        public Animals()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }

        public Animal this[int animalIndex]
        {
            get
            {
                return (Animal)List[animalIndex];
            }
            set
            {
                List[animalIndex]=value;
            }
        }
    }

2.关键字值集合和IDictionary

public class Animals:DictionaryBase
    {
        public void Add(string newID,Animal newAnimal)
        {
            Dictionary.Add(newID,newAnimal);
        }

        public void Remove(string animalID)
        {
            Dictionary.Remove(animalID);
        }

        public Animals()
        {
        
        }

        public Animal this[string animalID]
        {
            get
            {
                return (Animal)Dictionary[animalID];
            }
            set
            {
                Dictionary[animalID]=value;
            }
        }
}

To Be Continued....