strategy-theory.cs

最新推荐文章于 2022-03-01 21:44:39 发布

转载最新推荐文章于 2022-03-01 21:44:39 发布 · 67 阅读

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原文链接：http://www.cnblogs.com/shihao/archive/2012/05/17/2506821.html

本文介绍了一个使用C#实现的策略模式示例。该示例展示了如何通过定义一系列算法并将其封装到不同的类中来实现策略模式，从而使得算法可以独立于使用它的客户端而变化。通过上下文类和两种策略（Strategy1和Strategy2），示例还演示了如何在运行时切换不同的行为。

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using System;

// Strategy Pattern    by Judith Bishop         Oct 2007
// Shows two strategies and a random switch between them

// The Context
class Context {
    // Context state
    public const int start = 5;
    public int Counter = 5;

    // Strategy aggregation
    IStrategy strategy = new Strategy1();

    // Algorithm invokes a strategy method
    public int Algorithm() {
      return strategy.Move(this);
    }

    // Changing strategies
    public void SwitchStrategy() {
      if (strategy is Strategy1)
        strategy = new Strategy2();
      else
        strategy = new Strategy1();
    }
}

// Strategy interface
interface IStrategy {
    int Move (Context c);
}

// Strategy 1
class Strategy1 : IStrategy {
    public int Move (Context c) {
      return ++c.Counter;
    }
}

// Strategy 2
class Strategy2 : IStrategy {
    public int Move (Context c) {
      return --c.Counter ;
    }
}

// Client
static class Program {
    static void Main () {
      Context context = new Context();
      context.SwitchStrategy();
      Random r = new Random(37);
      for (int i=Context.start; i<=Context.start+15; i++) {
        if (r.Next(3) == 2) {
          Console.Write("|| ");
          context.SwitchStrategy();
        }
        Console.Write(context.Algorithm() +" ");
      }
      Console.WriteLine();
    }
}
/* Output
4 || 5 6 7 || 6 || 7 8 9 10 || 9 8 7 6 || 7 || 6 5
*/

转载于:https://www.cnblogs.com/shihao/archive/2012/05/17/2506821.html