1. C# Object Oriented Programming Concepts
MIS Professor Sandvig
11/19/2018
C# Object Oriented Programming Concepts
MIS 324
Professor Sandvig

2. MIS 324 -- Professor Sandvig
11/19/2018
Overview
OOP Benefits
Terminology
Creating classes
Instantiating objects
Constructors
Dice Roll example
Dog Example
Summary

3. MIS 324 -- Professor Sandvig
11/19/2018
OOP Benefits
Hide program complexity
simple public interface hides complexity inside
Support reusability
Create modularity
Reusability

4. OOP Benefits Legos analogy: Modular Reusable Simple interface
Each piece has single purpose
Reusable
Pieces can be used in multiple products
Simple interface
Maintainable

5. Terminology Encapsulation Fundamental principle of OOP
Code wrapped inside classes
Hide implementation details
Reduce complexity
Provide simple interface

6. Abstraction Interface exposing essential features
Implementation details hidden
Example:
Math.Pow(number, power)

7. MIS 324 -- Professor Sandvig
11/19/2018
Class
Typically represents real-world object
Person
Product
Shopping Cart
Etc.
Properties
Attributes
Methods
actions

8. Object
Object
Instance of a class
Has functionality of class

9. MIS 324 -- Professor Sandvig
11/19/2018
Instantiation
Source: asp.netPRO

10. MIS 324 -- Professor Sandvig
11/19/2018
Objects
Objects have properties & methods of class

11. MIS 324 -- Professor Sandvig
11/19/2018
Constructors
Constructors set object properties during initialization
Examples:
Dog myDog = new Dog(“Apollo”, “male”, 28);

12. Defining a Class in C# See “Classes in C#” handout
Random die rolls: /dice/diceRoller

13. MIS 324 -- Professor Sandvig
11/19/2018
Static Classes
Don’t need to instantiate
Typically utility-type classes
Examples:
Convert.ToString(33.3);
DateTime.Now.ToLongDateString();

14. MIS 324 -- Professor Sandvig
11/19/2018
Inheritance
Objects can inherit from other objects
Goal: never program anything twice
Beyond scope of this course

15. .NET Class Library Contains thousands of class Example Data access
Data collections
Drawing (graphics)
Web services
Etc.
Example
SqlCommand Class

16. MIS 324 -- Professor Sandvig
11/19/2018
Summary
Covered major OOP concepts/terminology
Goals:
Hide program complexity
Support reusability
Create modularity
Concepts & terminology is universal