Csharp/CSharp Tutorial/Data Structure/DictionaryBase

extends DictionaryBase

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

    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;
            }
        }
        public new IEnumerator GetEnumerator()
        {
            foreach (object animal in Dictionary.Values)
                yield return (Animal)animal;
        }
    }
    public abstract class Animal
    {
        protected string name;
        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }
        public Animal()
        {
            name = "no name";
        }
        public Animal(string newName)
        {
            name = newName;
        }
        public void Feed()
        {
            Console.WriteLine("feed:"+ name);
        }
    }
    public class Chicken : Animal
    {
        public void LayEgg()
        {
            Console.WriteLine("egg:"+ name);
        }
        public Chicken(string newName)
            : base(newName)
        {
        }
    }
    public class Cow : Animal
    {
        public void Milk()
        {
            Console.WriteLine("Milk:"+ name);
        }
        public Cow(string newName): base(newName)
        {
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Animals animalCollection = new Animals();
            animalCollection.Add("A", new Cow("A"));
            animalCollection.Add("B", new Chicken("B"));
            foreach (Animal myAnimal in animalCollection)
            {
                Console.WriteLine(myAnimal.ToString());
                Console.WriteLine(myAnimal.Name);
            }
        }
    }