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);
}
}
}
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