The client would only need to know how to handle the abstract Letter or Resume class, not the specific version that it got from the concrete factory. An example of this would be an abstract factory class DocumentCreator that provides interfaces to create a number of products (e.g. Now in the client code, we will ask the user to select the Credit Card Type. Each of the resulting objects would be created from the same DocumentCreator implementation and would share a common theme (they would all be fancy or modern objects). The Factory1 class implements the AbstractFactory interface by instantiating the ProductA1 and ProductB1 classes. These three factories will implement IFanFactory interface. Inside CreateFan method (which is Factory Method) in concrete Factories (TableFanFactory etc.) In the test itself, I’m just instantiating a Car based on a string provided to either the switch or factory class. This allows us to configure the factory from somewhere else, e.g. In the Factory Design pattern, we create an object without exposing the creation logic to the client and the client will refer to the newly created object using a common interface. The subclasses i.e. Abstract class need to have at least one unimplemented abstarct method which will be implemented in subclass to create the object. Excellent transmission of knowledge regarding design patterns in c #. Below is an example: thanks for the Factory Method Pattern. Alternative implementation using the classes themselves as factories: A sample UML class and sequence diagram for the Abstract Factory design pattern. In first part we have learned Simple Factory Pattern. I’ll drop my 2 cents on how you can implement the factory pattern without any use of code branching. First, create a class file with the name MoneyBack.cs and then copy and paste the following code in it. But it can create only one kind of products (which all implements IFan in our example), so next article we will see how we can have create a set of related products with Abstract Factory Pattern. Assume Company is going to launch new Fan called "PropellerFan". In this article we will understand Factory Method Pattern. My approach will still require you to manually go register a new Car type with our factory object. I hope this article will help you with your needs. I’m sure your DI framework of choice has something similar. If you want to avoid this, you’ll need to do some reflection work. A class can be configured with a factory object, which it uses to create objects, and even more, the factory object can be exchanged at run-time. Then we are just calling the three methods to display the credit card information in the console window. In the next article, I am going to discuss how to overcome the above problem by using the Factory Method Design Pattern in C#. Okay… I’ll quit beating around the bush and finally get into it. It’s all wired up already. The creation of an object precludes its reuse without significant duplication of code. Client calls CreateFan (Factory Method) without knowing how and what actual type of the object was created. The lifetime management of the generated objects must be centralized to ensure a consistent behavior within the application. ": Here IFan CreateFan(); is a Factory Method. Simple by creating the instant of PropellerFanFactory, clients will get the instance of PropellerFan. This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL), General    News    Suggestion    Question    Bug    Answer    Joke    Praise    Rant    Admin. To support additional products, we do not modify existing code but just add one new Factory class, so no need to re-run existing old unit tests. As you can see this class implements the CreditCard interface and provide implementation to all the three methods. We understood the context of Factory Method Pattern and how it is different from Simple Factory Pattern. The way a factory pattern typically provides benefit is by deciding what types to create, or how to instantiate them, based on parameters. Later, based on the order, it received, the appropriate product is delivered by the factory. The Client object calls createProductA() on the Factory1 object, which creates and returns a ProductA1 object. Principal of Factory Pattern is incredibly simple in its core. which makes the Client independent of how the objects are created (which concrete classes are instantiated). Note: we are using IFanFactory interface but instead of interface, an abstract class also can be used. The Factory Design Pattern in C# falls under the category of Creational Design Pattern. The Factory Design Pattern is one of the most frequently used design pattern in real-time applications. A Factory Pattern or Factory Method Pattern says that just define an interface or abstract class for creating an object but let the subclasses decide which class to instantiate. Platinum.cs: Create a class file with the name Platinum.cs and then copy and paste the following code in it. Its relay very clear to me. Encapsulate object creation in a separate (factory) object. Factory2 test is much like the previous test. So, modify the Main method as shown below. The time in milliseconds is the accumulated time of doing 1 million iterations. If one new client want one more method like GetAccountDetails() What will be the approach?? In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created. The system would have any number of derived concrete versions of the DocumentCreator class like FancyDocumentCreator or ModernDocumentCreator, each with a different implementation of createLetter() and createResume() that would create a corresponding object like FancyLetter or ModernResume. Following is the definition of Factory Method Pattern is taken from the same book: In simple words, if we have a superclass and n number of subclasses, and based on the data provided, if we have to create and return the object of one of the subclasses, then we need to use the factory design pattern. Let us know if you liked the post. We achieve all this following the approach I’m about to show you. "The Abstract Factory design pattern - Problem, Solution, and Applicability", "The Abstract Factory design pattern - Structure and Collaboration",, Articles with example Python (programming language) code, Creative Commons Attribution-ShareAlike License. Let us first discuss how to achieve this without using the Factory Design Pattern in C#.

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