using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;



namespace Strategy_Pattern

{

    class Program

    {

        static void Main(string[] args)

        {



            Context context;



            context = new Context(new ConcreteStrategyA());

            context.ContextInterface();



            context = new Context(new ConcreteStrategyB());

            context.ContextInterface();



            context = new Context(new ConcreteStrategyC());

            context.ContextInterface();





            Console.Read();



        }

    }

    abstract class Strategy

    {

        public abstract void AlgorithmInterface();





    }



    class ConcreteStrategyA : Strategy

    {



        public override void AlgorithmInterface()

        {

            Console.WriteLine("具体策略A的实现");



        }





    }



    class ConcreteStrategyB : Strategy

    {



        public override void AlgorithmInterface()

        {

            Console.WriteLine("具体策略b的实现");

        }

    }





    class ConcreteStrategyC : Strategy

    {



        public override void AlgorithmInterface()

        {

            Console.WriteLine("具体策略C的实现");

        }

    }



    class Context

    {

         Strategy strategy;

         //private ConcreteStrategyA concreteStrategyA;



         //public Context(ConcreteStrategyA concreteStrategyA)

         //{

         //    // TODO: Complete member initialization

         //    this.concreteStrategyA = concreteStrategyA;

         //}



        public Context(Strategy strategy)      //初始化时传入具体的Strategy对象

        {

            this.strategy = strategy;

        }



        public void ContextInterface()

        {

            strategy.AlgorithmInterface();

        }

    }



}