Abstract Factory in C#
Why read if you can watch?
Watch Abstract Factory's video tutorialProvides an interface for creating families of related or dependent objects without specifying their concrete classes.
This structural code demonstrates the Abstract Factory pattern creating parallel hierarchies of objects. Object creation has been abstracted and there is no need for hard-coded class names in the client code.
using System;
class MainApp
{
public static void Main()
{
// Abstract factory #1
AbstractFactory factory1 = new ConcreteFactory1();
Client c1 = new Client(factory1);
c1.Run();
// Abstract factory #2
AbstractFactory factory2 = new ConcreteFactory2();
Client c2 = new Client(factory2);
c2.Run();
// Wait for user input
Console.Read();
}
}
// "AbstractFactory"
abstract class AbstractFactory
{
public abstract AbstractProductA CreateProductA();
public abstract AbstractProductB CreateProductB();
}
// "ConcreteFactory1"
class ConcreteFactory1 : AbstractFactory
{
public override AbstractProductA CreateProductA()
{
return new ProductA1();
}
public override AbstractProductB CreateProductB()
{
return new ProductB1();
}
}
// "ConcreteFactory2"
class ConcreteFactory2 : AbstractFactory
{
public override AbstractProductA CreateProductA()
{
return new ProductA2();
}
public override AbstractProductB CreateProductB()
{
return new ProductB2();
}
}
// "AbstractProductA"
abstract class AbstractProductA
{
}
// "AbstractProductB"
abstract class AbstractProductB
{
public abstract void Interact(AbstractProductA a);
}
// "ProductA1"
class ProductA1 : AbstractProductA
{
}
// "ProductB1"
class ProductB1 : AbstractProductB
{
public override void Interact(AbstractProductA a)
{
Console.WriteLine(this.GetType().Name +
" interacts with " + a.GetType().Name);
}
}
// "ProductA2"
class ProductA2 : AbstractProductA
{
}
// "ProductB2"
class ProductB2 : AbstractProductB
{
public override void Interact(AbstractProductA a)
{
Console.WriteLine(this.GetType().Name +
" interacts with " + a.GetType().Name);
}
}
// "Client" - the interaction environment of the products
class Client
{
private AbstractProductA AbstractProductA;
private AbstractProductB AbstractProductB;
// Constructor
public Client(AbstractFactory factory)
{
AbstractProductB = factory.CreateProductB();
AbstractProductA = factory.CreateProductA();
}
public void Run()
{
AbstractProductB.Interact(AbstractProductA);
}
}
