说说设计模式~策略模式(Strategy)

#region 策略模式

    // The classes that implement a concrete strategy should implement this
    // The context class uses this to call the concrete strategy
    interface IStrategy
    {
        void Execute();
    }

    // Implements the algorithm using the strategy interface
    class ConcreteStrategyA : IStrategy
    {
        public void Execute()
        {
            Console.WriteLine("Called ConcreteStrategyA.Execute()");
        }
    }

    class ConcreteStrategyB : IStrategy
    {
        public void Execute()
        {
            Console.WriteLine("Called ConcreteStrategyB.Execute()");
        }
    }

    class ConcreteStrategyC : IStrategy
    {
        public void Execute()
        {
            Console.WriteLine("Called ConcreteStrategyC.Execute()");
        }
    }

    // Configured with a ConcreteStrategy object and maintains a reference to a Strategy object
    class Context
    {
        IStrategy strategy;

        // Constructor
        public Context(IStrategy strategy)
        {
            this.strategy = strategy;
        }

        public void Execute()
        {
            strategy.Execute();
        }
    }

    #endregion