class1.cs

来自「来自DoFactory的设计模式, 由于是本人根据已有代码创建,没有NETOpt」· CS 代码 · 共 88 行

// Strategy pattern -- Structural example  

using System;

namespace DoFactory.GangOfFour.Strategy.Structural
{

    // MainApp test application 

    class MainApp
    {
        static void Main()
        {
            Context context;

            // Three contexts following different strategies 
            context = new Context(new ConcreteStrategyA());
            context.ContextInterface();

            context = new Context(new ConcreteStrategyB());
            context.ContextInterface();

            context = new Context(new ConcreteStrategyC());
            context.ContextInterface();

            // Wait for user 
            Console.Read();
        }
    }

    // "Strategy" 

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

    // "ConcreteStrategyA" 

    class ConcreteStrategyA : Strategy
    {
        public override void AlgorithmInterface()
        {
            Console.WriteLine(
              "Called ConcreteStrategyA.AlgorithmInterface()");
        }
    }

    // "ConcreteStrategyB" 

    class ConcreteStrategyB : Strategy
    {
        public override void AlgorithmInterface()
        {
            Console.WriteLine(
              "Called ConcreteStrategyB.AlgorithmInterface()");
        }
    }

    // "ConcreteStrategyC" 

    class ConcreteStrategyC : Strategy
    {
        public override void AlgorithmInterface()
        {
            Console.WriteLine(
              "Called ConcreteStrategyC.AlgorithmInterface()");
        }
    }

    // "Context" 

    class Context
    {
        Strategy strategy;

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

        public void ContextInterface()
        {
            strategy.AlgorithmInterface();
        }
    }
}