设计模式：策略模式

#region  策略模式

    #region  抽象策略
    public abstract class Stratety
    {
        public abstract void StrategyInterface();//子类要实现的方法
    }
    #endregion

    #region  具体策略
    public class ConcreteStrategyA:Stratety
    {
        public override void StrategyInterface()
        {
            Console.WriteLine("A:类A的实现方法");
        }
    }

    public class ConcreteStrategyB : Stratety
    {
        public override void StrategyInterface()
        {
            Console.WriteLine("B:类B的实现方法");
        }
    }

    public class ConcreteStrategyC : Stratety
    {
        public override void StrategyInterface()
        {
            Console.WriteLine("C:类C的实现方法");
        }
    }
    #endregion

    public class Context
    {
        Stratety stratety;

        public Context(Stratety f_Stratety)
        {
            stratety = f_Stratety;
        }

        public Context()
        {
        }

        public void ExecFun()
        {
            if (stratety != null)
                stratety.StrategyInterface();
        }
    }

    #endregion

static void Main(string[] args)
        {
          
            #region  策略模式

            Context _context;
            _context = new Context(new ConcreteStrategyA());
            _context.ExecFun();

            _context = new Context(new ConcreteStrategyB());
            _context.ExecFun();

            _context = new Context(new ConcreteStrategyC());
            _context.ExecFun();
            #endregion

            Console.ReadLine();
        }