Strategy Pattern

  • Behavioral design pattern
  • The intent of this pattern is to define a family of algorithms, encapsulate each one , and make them interchangeable. Strategy lets the algorithm vary independently from clients that use it.
  • Context is configured with a concretestrategy object maintains a reference to a strategy object.
  • Strategy declares an interface common to all supported algorithms. Context uses it to call the algorithm defined by concretestrategy
				
					namespace strategypattern
{
    public class Order
    {
        public string OrderId { get; set; }
        public string ProductName { get; set; }
        public string ProductDisplayName { get; set; }
        public string ProductPrice { get; set; }
        public IDownloadOrder DownloadOrderService { get; set; }
        public Order(string orderId, string productName, string productDisplayName, string productPrice)
        {
            OrderId = orderId;
            ProductName = productName;
            ProductDisplayName = productDisplayName;
            ProductPrice = productPrice;
            //you can set default value in the constructor
            //downloadOrderService = new JSONDownloadOrder;

            //or

            //directly pass as parameter to the constructor 
            //public Order(string orderId, string productName, string productDisplayName, string productPrice,IDownloadOrder downloadOrderService)
        }

        public void Download()
        {
            DownloadOrderService.Download(this);
        }
    }

}

				
			
				
					namespace strategypattern
{
    public interface IDownloadOrder
    {
        void Download(Order order);
    }

    

    public class XMLDownloadOrder : IDownloadOrder
    {
        public void Download(Order order)
        {
            Console.WriteLine("downloading order as xml");
        }
    }

    public class JSONDownloadOrder : IDownloadOrder
    {
        public void Download(Order order)
        {
            Console.WriteLine("downloading order as JSON");
        }
    }

    public class CSVDownloadOrder : IDownloadOrder
    {
        public void Download(Order order)
        {
            Console.WriteLine("downloading order as CSV");
        }
    }
}

				
			
				
					using strategypattern;

var order = new Order("123", "ps5", "ps5 console", "54990");
order.DownloadOrderService = new JSONDownloadOrder();
order.Download();

downloading order as JSON

https://github.com/AnuragDaCoder/strategy

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