Microsoft .NET Runtime

1
Object Orientation
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2
Object Orientation (OO)

• .NET framework is fully object oriented
• Everything is an object
• All .NET languages provide full support for
  object-oriented programming
• Understanding object-orientation is they key to
  understand .NET framework

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3
Object Orientation (OO)

• OO concepts
• Everything is an object
• Objects interact with each other to get their
  work done
• Objects encapsulate their information and
  behavior from other objects
• Objects inherit from other objects to consume
  their functionality

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4
Object Orientation (OO)

• Encapsulation
• An object can hide the details behind its
  behavior from other objects
• Fields
• Used for holding data values specific to the
  object
• Properties
• Used to provide controlled access to data values
• Methods
• Used to define behaviors for the object
• Events
• Used to notify other objects about the occurrence
  of some event

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5
Object Orientation (OO)

• Class
• Blueprint of an object
• Many objects can be created from one class, just
  like many buildings can be created from one
  blueprint
• Access modifiers
• Private Members are only accessible by the
  object itself
• Public Members are accessible for all objects
• Private Members are accessible by the object
  itself and its child objects

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6
Object Orientation (OO)

• Inheritance
• An object can inherit from another object to
  extend its functionality
• Inheritance provides mechanism for code reuse
  between similar objects

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7
Object Orientation (OO)

• Interface
• Interface defines a contract
• Any object can implement an interface to provide
  code for the contract
• Many objects can provide their own code for the
  same interface

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8
Object Orientation (OO)

• Polymorphism
• Multiple objects can provide different behavior
  for same method
• Inheritance Polymorphism
• Child objects can overwrite a method declared in
  parent object to provide their own functionality
• Interface Polymorphism
• Various objects can provide different
  functionality for same method by implementing a
  common interface

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