NET. C #. 04 Design Patterns

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1. NET. C #. 04 Design Patterns
2. Christopher Alexander says, "Each pattern describes a
3. Must have… and must read…
4. Desing patterns classification Creational patterns concern the
5. Abstract Factory Creational pattern Provide an interface
6. AbstractFactory - declares an interface for operations
7. Abstract Factory: UML class diagram
8. CarFactory. Step 1
9. Car Factory. Step 2
10. Car Factory. Step 3
11. Car Factory. Step 4
12. Abstract Factory: example.Abstract Factory - CarFactory abstract
13. Concrete Factory - BMWFactory class BMWFactory
14. class AudiFactory :
15. abstract class AbstractCar { public abstract
16. Class implementation - BMWCar class BMWCar : AbstractCar
17. class AudiCar : AbstractCar {
18. class Client { private AbstractCar abstractCar;
19. public static void Main() { // Abstract
20. Builder Pattern Creational pattern Separate the construction
21. Builder - specifies an abstract interface for
22. Builder: UML class diagram
23. Builder
24. Builder. UML
25. Builder: ExampleHappyMeal, BigHappyMeal class HappyMeal {
26. Builder. ExampleDeclare a builder - an abstract interface for creating
27. BuilderDeclare a concrete builder BigHappyMeal{ class BigHappyMealBuilder : HappyMealBuilder
28. BuilderDeclare a concrete builder HappyMeal class SmallHappyMealBuilder : HappyMealBuilder {
29. BuilderClass Director – will construcr the object class
30. Builderpublic static void Main() { //
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Christopher Alexander says, "Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a

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Слайд 1NET.C#.04 Design Patterns.

Слайд 2Christopher Alexander says,
"Each pattern describes a problem which occurs

over and over again in our environment, and then describes

the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice"

In software engineering,
a design pattern is a general reusable solution to a commonly occurring problem. A design pattern is not a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations.
Object-oriented design patterns show relationships and interactions between classes or objects, without specifying the final application classes or objects that are involved.

What is a Design Pattern ?

Слайд 3Must have… and must read…

Слайд 4Desing patterns classification
Creational patterns concern the process of object

creation.
Structural patterns deal with the composition of classes or objects.
Behavioral

patterns characterize the ways in which classes or objects interact and distribute responsobility

Desing patterns classification Creational patterns concern the process of object creation.Structural patterns deal with the composition of

Слайд 5Abstract Factory
Creational pattern
Provide an interface for creating families

of related or dependent objects without specifying their concrete classes.
Participants
The

classes and/or objects participating in this pattern are:
Abstract Factory
Concrete Factory
Abstract Product
Product
Client

Abstract Factory Creational pattern Provide an interface for creating families of related or dependent objects without specifying

Слайд 6AbstractFactory - declares an interface for operations that create abstract

products
Abstract Factory: participants
ConcreteFactory - implements the operations to create concrete

product objects

AbstractProduct - declares an interface for a type of product object

Product - defines a product object to be created by the corresponding concrete factory implements the AbstractProduct interface

Client uses interfaces declared by AbstractFactory and AbstractProduct classes

AbstractFactory - declares an interface for operations that create abstract products Abstract Factory: participantsConcreteFactory - implements the operations

Слайд 7Abstract Factory: UML class diagram

Слайд 8CarFactory. Step 1

Слайд 9Car Factory. Step 2

Слайд 10Car Factory. Step 3

Слайд 11Car Factory. Step 4

Слайд 12Abstract Factory: example.
Abstract Factory - CarFactory
abstract class CarFactory {

public abstract AbstractCar CreateCar(); public abstract AbstractEngine CreateEngine(); }

Abstract Factory: example.Abstract Factory - CarFactory abstract class CarFactory { public abstract AbstractCar CreateCar();

Слайд 13Concrete Factory - BMWFactory

class BMWFactory : CarFactory { public

override AbstractCar CreateCar() { return new BMWCar(); } public override AbstractEngine

CreateEngine() { return new BMWEngine(); } }

Abstract Factory->Concrete Factory

Concrete Factory - BMWFactory class BMWFactory : CarFactory { public override AbstractCar CreateCar()

Слайд 14 class AudiFactory : CarFactory { public override AbstractCar

CreateCar() { return new AudiCar(); } public override AbstractEngine CreateEngine() { return new

AudiEngine(); } }

Abstract Factory->Concrete Factory

Concrete Factory - AudiFactory

class AudiFactory : CarFactory { public override AbstractCar CreateCar() {

Слайд 15 abstract class AbstractCar {
public abstract void MaxSpeed(AbstractEngine engine);
}
Abstract

Factory->Abstract Product
abstract class AbstractEngine { public int max_speed; }
Abstract Product -

AbsrtactCar

Abstract Product - AbsrtactEngine

abstract class AbstractCar { public abstract void MaxSpeed(AbstractEngine engine); }Abstract Factory->Abstract Product abstract class AbstractEngine

Слайд 16Class implementation - BMWCar
class BMWCar : AbstractCar { public override void

MaxSpeed(AbstractEngine engine) { Console.WriteLine(«Max speed:« +

engine.max_speed.ToString()); } }

Abstract Product->Concrete Product

Class implementation - BMWEngine

class BMWEngine : AbstractEngine { public BMWEngine() { max_speed = 200; } }

Class implementation - BMWCar class BMWCar : AbstractCar { public override void MaxSpeed(AbstractEngine engine) {

Слайд 17 class AudiCar : AbstractCar { public override void MaxSpeed(AbstractEngine

engine) { Console.WriteLine(«Макcимальная скорость: « +

engine.max_speed.ToString()); } }
//Concrete Engine
class AudiEngine : AbstractEngine { public AudiEngine() { max_speed = 180; } }

Abstract Product->Concrete Product

Class implementation - AudiCar

class AudiCar : AbstractCar { public override void MaxSpeed(AbstractEngine engine) {

Слайд 18 class Client { private AbstractCar abstractCar; private AbstractEngine abstractEngine; public

Client(CarFactory car_factory) { abstractCar = car_factory.CreateCar(); abstractEngine = car_factory.CreateEngine (); } public void

Run() { abstractCar.MaxSpeed(abstractEngine); } }

Abstract Factory. Пример

Class implementation – Client, works with abstract factory

$class Client { private AbstractCar abstractCar; private AbstractEngine abstractEngine; public Client(CarFactory car_factory) {$

Слайд 19 public static void Main() { // Abstract Factory № 1

CarFactory bmw_car = new BMWFactory (); Client c1 = new Client(bmw_car); c1.Run();

// Abstract Factory № 2 CarFactory audi_factory = new AudiFactory(); Client c2 = new Client(audi_factory); c2.Run(); Console.Read(); }

Abstract Factory.

$public static void Main() { // Abstract Factory № 1 CarFactory bmw_car = new$

Слайд 20Builder Pattern
Creational pattern
Separate the construction of a complex

object from its representation so that the same construction process

can create different representations.

Participants
The classes and/or objects participating in this pattern are:
Builder
Concrete Builder
Director
Product

Builder Pattern Creational pattern Separate the construction of a complex object from its representation so that the

Слайд 21Builder - specifies an abstract interface for creating parts of

a Product object
Builder: participants
ConcreteBuilder -
constructs and assembles parts of

the product by implementing the Builder interface
defines and keeps track of the representation it creates
provides an interface for retrieving the product

Director - constructs an object using the Builder interface

Product
represents the complex object under construction ConcreteBuilder builds the product's internal representation and defines the process by which it's assembled
includes classes that define the constituent parts, including interfaces for assembling the parts into the final result

Builder - specifies an abstract interface for creating parts of a Product objectBuilder: participantsConcreteBuilder - constructs and assembles

Слайд 22Builder: UML class diagram

Слайд 23Builder

Слайд 24Builder. UML

Слайд 25Builder: Example
HappyMeal, BigHappyMeal
class HappyMeal { // contains information about parts of

HappyMeal ArrayList parts = new ArrayList(); // adds a

new part public void Add(string part) { parts.Add(part); } // Shows information about HappyMeal public void Show() { Console.WriteLine(" Happy Meal Parts ——-"); foreach (string part in parts) Console.WriteLine (part); } }

Builder: ExampleHappyMeal, BigHappyMeal class HappyMeal { // contains information about parts of HappyMeal ArrayList

Слайд 26Builder. Example
Declare a builder - an abstract interface for creating an object in parts

abstract class HappyMealBuilder { public abstract void BuildBurger(); public abstract

void BuildPepsi(); public abstract void BuildFries(); public abstract void BuildToy(); public abstract HappyMeal GetProduct(); }

Builder. ExampleDeclare a builder - an abstract interface for creating an object in parts abstract class HappyMealBuilder {

Слайд 27Builder
Declare a concrete builder BigHappyMeal
{ class BigHappyMealBuilder : HappyMealBuilder { private HappyMeal

happy_meal = new HappyMeal(); public override void BuildBurger() { happy_meal.Add("BigMac"); }

public override void BuildPepsi() { happy_meal.Add("Pepsi 0.7"); } public override void BuildFries() { happy_meal.Add("BigFries"); } public override void BuildToy() { happy_meal.Add("Two toys"); } public override HappyMeal GetProduct() { return happy_meal; } }

$BuilderDeclare a concrete builder BigHappyMeal{ class BigHappyMealBuilder : HappyMealBuilder { private HappyMeal happy_meal = new HappyMeal();$

Слайд 28Builder
Declare a concrete builder HappyMeal
class SmallHappyMealBuilder : HappyMealBuilder { private HappyMeal happy_meal =

new HappyMeal(); public override void BuildBurger() { happy_meal.Add("Hamburger"); } public override void BuildPepsi() { happy_meal.Add("Pepsi

0.3"); } public override void BuildFries() { happy_meal.Add("SmallFries"); } public override void BuildToy() { happy_meal.Add("One toy"); } public override HappyMeal GetProduct() { return happy_meal; } }

$BuilderDeclare a concrete builder HappyMeal class SmallHappyMealBuilder : HappyMealBuilder { private HappyMeal happy_meal = new HappyMeal(); public override$

Слайд 29Builder
Class Director – will construcr the object
class Director { //

Constructing the object in parts public void Construct(HappyMealBuilder builder) { builder.BuildBurger(); //Call

Build-methods builder.BuildPepsi(); builder.BuildFries(); builder.BuildToy(); } }

BuilderClass Director – will construcr the object class Director { // Constructing the object in parts

Слайд 30Builder
public static void Main() { // Create a Director and builders Director

director = new Director(); HappyMealBuilder big_hmbuilder = new BigHappyMealBuilder(); HappyMealBuilder

small_hmbuilder = new SmallHappyMealBuilder(); // Construct two products director.Construct(big_hmbuilder); HappyMeal hm1 = big_hmbuilder.GetProduct(); hm1.Show(); director.Construct(small_hmbuilder); HappyMeal hm2 = small_hmbuilder.GetProduct(); hm2.Show(); }

Builderpublic static void Main() { // Create a Director and builders Director director = new Director();

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