class1.cs

来自DoFactory的设计模式, 由于是本人根据已有代码创建,没有NETOptimized项

// Strategy pattern -- Real World example  

using System;
using System.Collections;

namespace DoFactory.GangOfFour.Strategy.RealWorld
{

    // MainApp test application 

    class MainApp
    {
        static void Main()
        {
            // Two contexts following different strategies 
            SortedList studentRecords = new SortedList();

            studentRecords.Add("Samual");
            studentRecords.Add("Jimmy");
            studentRecords.Add("Sandra");
            studentRecords.Add("Vivek");
            studentRecords.Add("Anna");

            studentRecords.SetSortStrategy(new QuickSort());
            studentRecords.Sort();

            studentRecords.SetSortStrategy(new ShellSort());
            studentRecords.Sort();

            studentRecords.SetSortStrategy(new MergeSort());
            studentRecords.Sort();

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

    // "Strategy" 

    abstract class SortStrategy
    {
        public abstract void Sort(ArrayList list);
    }

    // "ConcreteStrategy" 

    class QuickSort : SortStrategy
    {
        public override void Sort(ArrayList list)
        {
            list.Sort(); // Default is Quicksort 
            Console.WriteLine("QuickSorted list ");
        }
    }

    // "ConcreteStrategy" 

    class ShellSort : SortStrategy
    {
        public override void Sort(ArrayList list)
        {
            //list.ShellSort(); not-implemented 
            Console.WriteLine("ShellSorted list ");
        }
    }

    // "ConcreteStrategy" 

    class MergeSort : SortStrategy
    {
        public override void Sort(ArrayList list)
        {
            //list.MergeSort(); not-implemented 
            Console.WriteLine("MergeSorted list ");
        }
    }

    // "Context" 

    class SortedList
    {
        private ArrayList list = new ArrayList();
        private SortStrategy sortstrategy;

        public void SetSortStrategy(SortStrategy sortstrategy)
        {
            this.sortstrategy = sortstrategy;
        }

        public void Add(string name)
        {
            list.Add(name);
        }

        public void Sort()
        {
            sortstrategy.Sort(list);

            // Display results 
            foreach (string name in list)
            {
                Console.WriteLine(" " + name);
            }
            Console.WriteLine();
        }
    }
}