定义泛型类

来源：互联网发布：佳能ip7280清零软件编辑：程序博客网时间：2024/05/18 16:19

......又是继承又是实现接口看得我累崩了汗...真够绕啊

Code:

public abstract class Animal
{
protected string name;
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
public Animal()
{
name = "The animal with no name";
}
public Animal(string newName)
{
name = newName;
}
public void Feed()
{
Console.WriteLine("{0} has been fed.", name);
}
public abstract void MakeANoise();
}
public class Chicken : Animal
{
public void LayEgg()
{
Console.WriteLine("{0} has laid an egg.", name);
}
public Chicken(string newName)
: base(newName)
{
}
public override void MakeANoise()
{
Console.WriteLine(" {0} says 'Cluck!'", name);
}
}
public class Cow : Animal
{
public void Milk()
{
Console.WriteLine("{0} has been milked.", name);
}
public Cow(string newName)
: base(newName)
{
}
public override void MakeANoise()
{
Console.WriteLine(" {0} syas 'moo'.", name);
}
}
public class SuperCow:Cow
{
public void Fly()
{
Console.WriteLine(" {0} is flying!", name);
}
public SuperCow(string newName)
: base(newName)
{
}
public override void MakeANoise()
{
Console.WriteLine("{0} says 'here I come to save the day!'", name);
}
}
public class Farm<T> : IEnumerable<T>
where T:Animal
{
private List<T> animals = new List<T>();
//只读属性
public List<T> Animals
{
get { return animals; }
}
//实现IEnumerable<T>.GetEnumerator()
public IEnumerator<T> IEnumerable<T>.GetEnumerator()
{
return animals.GetEnumerator();
}
//实现 IEnumerable.GetEnumerator()
IEnumerator IEnumerable.GetEnumerator()
{
return animals.GetEnumerator();
}
public void MakeNoises()
{
foreach (T animal in animals)
{
//由于做了约束
animal.MakeANoise();
}
}
/// <summary>
///提取是 Cow或继承自Cow的项
/// </summary>
/// <returns></returns>
public Farm<Cow> GetCows()
{
Farm<Cow> cowFarm = new Farm<Cow>();
foreach (T animal in animals)
{
if (animal is Cow)
{
cowFarm.Animals.Add(animal as Cow);
}
}
return cowFarm;
}
public void FeedTheAnimals()
{
foreach (T animal in animals)
{
animal.Feed();
}
}
}