《大话设计模式》读书笔记2 策略模式

策略模式（Strategy）：它定义了算法家族，分别封装起来，让它们之间可以相互替换，此模式让算法的变化，不会影响到使用算法的客户。

策略模式结构图：

策略模式实现代码：

abstract class Strategy
{
	public abstract void AlgorithmInterface();	
}

class ConcreStrategyA:Strategy
{
	public override void AlgorithmInterface();
	{
		console.WriteLine("算法A实现");
	}
}

class ConcreStrategyB:Strategy
{
	public override void AlgorithmInterface();
	{
		console.WriteLine("算法B实现");
	}
}

class ConcreStrategyC:Strategy
{
	public override void AlgorithmInterface();
	{
		console.WriteLine("算法C实现");
	}
}
class Context
{
	Strategy strategy;
	public Context(Strategy strategy)
	{
		this.strategy=strategy;
	}
	
	public void ContexInterface()
	{
		strategy.AlgorithmInterface();	
	}
}

public void Main(string[] args)
{
	Context context;
	
	context =new Context(new ConcreStrategyA());
	context.ContexInterface();
	
	context =new Context(new ConcreStrategyB());
	context.ContexInterface();
	
	context =new Context(new ConcreStrategyC());
	context.ContexInterface();
	
	Console.Read();
	
}