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Microsoft PowerPoint OOP with VB.NET.ppt

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Object Oriented Programming. with Visual Basic .NET. Visual Basic as a true Object. Oriented language. Previous versions (6.0 and earlier) were object ...

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Microsoft PowerPoint OOP with VB.NET.pptPage 11Object Oriented Programming with Visual Basic .NETVisual Basic as a true Object Oriented language Previous versions (6.0 and earlier) were objectbased e.g. allowed Encapsulation within classes and interfacebased programming to take advantage of COM. Visual Basic .NET now has inheritance (#1 most requested feature) polymorphism parameterized constructors Structured Exception Handling. Visual Basic is now a first class citizen and no longer the poor relation as compared to C++ C# etc. Very powerful yet maintaining the ease of use through its famous syntax.Page 22Agenda Core Tenets of ObjectOrientation OO features/keywords of Visual Basic .NET Abstraction Encapsulation Inheritance Abstract Classes Interfaces PolymorphismCore Tenets of Object Orientation Abstraction Polymorphism Inheritance Encapsulation This equates to: A PIEPage 33OO keywords in Visual Basic 6.0 Class Interface Implements Private Public FriendOO keywords in Visual Basic .NET Class Interface Implements Private Public Friend Inherits MustInherit NotInheritable Protected Overrides MustOverride Overridable NotOverridablePage 44Abstraction Abstraction manages the complexities of a problem by allowing you to identify a set of objects Decomposing a programming problem into a set of classes More of a software architecture/design phase activity.Encapsulation Hides the internal implementation of an abstraction within the particular object. Prevents usage in undesired ways and lets you modify such items later without risk of compatibility problems. Allows you to contain and control access to a group of associated items. Class data should be modified or retrieved only via Property procedures or methods. Page 55Object Lifecycle Management Constructors replace VB 6.0 initialize event. Can accept parameters. E.g. Public Sub New (ByVal salary As Decimal) Create new objects with New keyword. Finalize event replaces VB 6.0 Terminate() but nondeterministic. Implement ...

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