Strategy design pattern

• According to the Gang of Four Definitions, Strategy is a behavioral design pattern that lets you define a family of algorithms, put each of them into a separate class, and make their objects interchangeable.

• The Strategy Design Pattern is a behavioral design pattern that defines a family of algorithms, encapsulates each one, and makes them interchangeable. It allows the algorithm to vary independently from clients that use it.

Understanding Stratery Design Pattern with an Example in C#:

• Create an interface with IPaymentStrategy

  

• Create PaymentType Enum

  

• CreditCardPaymentStrategy Concrete Strategy class implements the IPaymentStrategy Interface and provides implementations for the Pay Method.

  

• CashCardPaymentStrategy Concrete Strategy class implements the IPaymentStrategy Interface and provides implementations for the Pay Method.

  

• Create PaymentContext class that contains a property that holds the reference of a Strategy object. The client will set this property at run-time according to the payment option the client selected

  

• Client code