strategystructural.cs

来自「使用C#程序将23个常用设计模式进行列表显示」· CS 代码 · 共 81 行

using System;
using System.Windows.Forms;
using System.Text;

namespace DesignPattern.StrategyStructural
{
    class StrategyStructural : AbstractPattern
    {
        public static void Run(TextBox tbInfo)
        {
            s_tbInfo = tbInfo;
            s_tbInfo.Text = "";

            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() 
        {
            DesignPattern.FormMain.OutputInfo( "Called ConcreteStrategyA.AlgorithmInterface()"); 
        }
    }
    
    // "ConcreteStrategyB" 
    class ConcreteStrategyB : Strategy 
    {
        public override void AlgorithmInterface() 
        {
            DesignPattern.FormMain.OutputInfo( "Called ConcreteStrategyB.AlgorithmInterface()"); 
        }
    }
    
    // "ConcreteStrategyC" 
    class ConcreteStrategyC : Strategy 
    {
        public override void AlgorithmInterface() 
        {
            DesignPattern.FormMain.OutputInfo( "Called ConcreteStrategyC.AlgorithmInterface()"); 
        }
    }
    
    // "Context" 
    class Context 
    {
        Strategy strategy; 
        
        // Constructor 
        public Context(Strategy strategy) 
        {
            this.strategy = strategy; 
        }
        
        public void ContextInterface() 
        {
            strategy.AlgorithmInterface();
        }
    }
}