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The document discusses key concepts in object-oriented programming with C# including classes, methods, inheritance, polymorphism, constructors, and destructors. It notes that classes should be nouns and methods can begin with letters, underscores, or @ symbols. Methods can be invoked, overloaded, and have different access levels. Constructors initialize objects while static constructors initialize class-level variables. Destructors clean up objects before garbage collection.
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- 1. Class and Method Programming in C# tnngo2@gmail.com
- 3. Object-oriented programming Programming languages designed based on data and ways to manipulate data. Procedural Languages (Pascal, C) focus on ways Object-oriented Languages (C#, Java) focus on data
- 4. Features Abstraction Encapsulation Inheritance Polymorphism Focus only the required information from objects
- 5. Features Abstraction Encapsulation Inheritance Polymorphism Hide details of what a class contains
- 6. Features Abstraction Encapsulation Inheritance Polymorphism Create a new class based on the attributes and methods of an existing class
- 7. Features Abstraction Encapsulation Inheritance Polymorphism Behave differently in different situations
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- 9. Class – should & cannot Should be a noun first letter capitalized simple, descriptive, meaningful Cannot in mixed case C# keyword begin with a digit except @, _
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- 11. Method – can & cannot Can begin with a letter, _ or @ Cannot C# keyword contain space begin with digit
- 12. Invoking methods https://gist.github.com/2349623
- 13. Static methods called without creating any objects of the class refer only to static variables and other static methods of class. https://gist.github.com/2349658
- 14. Static methods Only one copy of static variable is shared by all the objects of the class.
- 15. Question? https://gist.github.com/2349708
- 16. Access Modifiers
- 17. Access Modifiers
- 18. Ref causes arguments to be passed in a method by reference https://gist.github.com/2344456
- 19. Out similar to ref but no required the variables that are passed by reference to be initialized https://gist.github.com/2344483
- 21. Method overloading every method has a signature which comprises the number of params the data types of params the order of params
- 22. Should and avoid Methods to be overloaded should perform the same task The signatures of the overloaded must be unique Return type is not a part of the signature The ref and out parameters can be included as a part of the signature
- 23. This keyword refer to the current object of the class. cannot use this keyword with static variables and method https://gist.github.com/2344534
- 24. Question? https://gist.github.com/2349708
- 26. Constructors initialization no return type possible to have overloaded constructors https://gist.github.com/2344570
- 27. Default Constructors C# creates a default constructors for a class if no constructor is specified within the class. It automatically initializes all the numeric data type instance variables to zero. If you define a constructor in the class, the default constructor is no longer used.
- 28. Static Constructors initialize static variables of the class and to perform a particular action only once. is invoked before any static member of the class is accessed. does not take any parameters and does not use any access modifiers because it is invoked directly by the CLR instead of the object. Certainly, cannot access non-static data member. https://gist.github.com/2344643
- 29. Constructor Overloading https://gist.github.com/2344673
- 30. Destructors invoked automatically when the objects are not in use only one destructor in a class cannot be overloaded or inherited cannot be explicitly invoked cannot specify access modifiers and cannot take parameters https://gist.github.com/2344708