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Object-oriented Programming in C#
Abstract classes, Interfaces, and Patterns
* Method Combination
Method Combination
Parameter Variance
Covariance and Contravariance
* Abstract Classes - Sealed Classes
Abstract Classes
Abstract classes and abstract methods in C#
Abstract Properties
Sealed Classes and Sealed Methods
* Interfaces
Interfaces
Interfaces in C#
Examples of Interfaces
Interfaces from the C# Libraries
Sample use of IComparable
Sample use of IEnumerator and IEnumerable
Sample use of IFormattable
Explicit Interface Member Implementations
* Patterns and Techniques
The Composite design pattern
A Composite Example: Music Elements
An application of Music Elements
Implementation of MusicElement classes
A Composite example: IntSequence
A Composite example: IntSequence application
Implementation of the IntSequence classes
A Composite Example: A GUI
A Composite Example: A GUI
A Composite Example: A GUI
Cloning
Cloning in C#
The fragile base class problem
The Visitor design pattern
Natural object-oriented IntSequence traversals
Towards a Visitor solution
A Visitor example: IntSequence
Visitors - Pros and Cons
Towards a Visitor solution
The transition from natural object-oriented traversals to
Visitor
Steps:
A
Visitor
interface and three concrete Visitor classes are defined
The
Intsequence
classes are refactored - the traversal methods are moved to the visitor classes
Accept
methods are defined in the
IntSequence
classes.
Accept
takes a
Visitor
as parameter
Accept
passes
this
to the visitor, which in turn may activate
Accept
on components
Try the accompanying
SVG animation
