策略模式简单说明

/// <summary>
/// 鸭子类
/// </summary>
public abstract class Duck
{
protected IFlyBehavior flyBehavior;
protected IQuackBehavior quackBehavior;
public Duck()
{
}

public abstract void Display();
public void PerformFly()
{
flyBehavior.Fly();
}

public void PerformQuack()
{
quackBehavior.Quck();
}

public void setFlyBehavior(IFlyBehavior fb)
{
flyBehavior = fb;
}

public void setQuckBehavior(IQuackBehavior qb)
{
quackBehavior = qb;
}

public void Swim()
{
Console.WriteLine("鸭子全都会游泳！");
}
}

/// <summary>
/// 飞行行为
/// </summary>
public interface IFlyBehavior
{
void Fly();
}

public class FlyNoWay:IFlyBehavior
{
public void Fly()
{
Console.WriteLine("不会飞！");
}
}

public class FlyWithWings :IFlyBehavior
{
public void Fly()
{
Console.WriteLine("飞飞飞！");
}
}

public class FlyRocketPower:IFlyBehavior
{
public void Fly()
{
Console.WriteLine("火箭加速飞！");
}
}


/// <summary>
/// 绿头鸭
/// </summary>
public class MallardDuck:Duck
{
public MallardDuck()
{
flyBehavior = new FlyWithWings();
quackBehavior = new Quack();
}
public override void Display()
{
Console.WriteLine("我是一只绿头鸭！");
}
}

/// <summary>
/// 模型鸭
/// </summary>
public class ModelDuck:Duck
{
public ModelDuck()
{
flyBehavior = new FlyNoWay();
quackBehavior = new MuteQuack();
}
public override void Display()
{
Console.WriteLine("我是一个模型鸭");
}
}
static void Main(string[] args)
{
Duck muteQuack = new MallardDuck();

muteQuack.PerformFly();

Duck model = new ModelDuck();
model.PerformFly();
model.setFlyBehavior(new FlyRocketPower());
model.PerformFly();
Console.ReadLine();
}