Strategy

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Strategy{ class Program { static void Main(string[] args) { // 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.ReadKey(); } } /// <summary> /// The 'Strategy' abstract class /// </summary> abstract class SortStrategy { public abstract void Sort(List<string> list); } /// <summary> /// A 'ConcreteStrategy' class /// </summary> class QuickSort : SortStrategy { public override void Sort(List<string> list) { list.Sort(); // Default is Quicksort Console.WriteLine("QuickSorted list "); } } /// <summary> /// A 'ConcreteStrategy' class /// </summary> class ShellSort : SortStrategy { public override void Sort(List<string> list) { //list.ShellSort(); not-implemented Console.WriteLine("ShellSorted list "); } } /// <summary> /// A 'ConcreteStrategy' class /// </summary> class MergeSort : SortStrategy { public override void Sort(List<string> list) { //list.MergeSort(); not-implemented Console.WriteLine("MergeSorted list "); } } /// <summary> /// The 'Context' class /// </summary> class SortedList { private List<string> _list = new List<string>(); 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); // Iterate over list and display results foreach (string name in _list) { Console.WriteLine(" " + name); } Console.WriteLine(); } }}