Object Oriented Programming with Visual Basic .NET
Short summary:
Object Oriented Programming with Visual Basic .NET. Visual Basic as a true Object. allowed Encapsulation within classes and interface-based programming to take advantage of COM. Visual Basic...
Long summary:
Object 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 non-deterministic. Implement IDisposable interface instead and call obj.Dispose() to simulate a delete. No true deterministic destructors as in C++ due to garbage collection mechanism. Implementation Inheritance Visual Basic .NET provides for true implementation inheritance whereby you can reuse the implementation of a class. By inheriting, a class receives the visible methods, properties, and events of the base class. We all inherit implicitly from Object whenever we make a new class, e.g. the toString() method. 6 When to use Implementation Inheritance Inheritance hierarchy represents is-a relationships and not has-a. The base class code is reusable. You want to make global changes to derived classes. Dont go too deep! Class Hierarchy Design: Considerations for Extensibility Define classes at each level of an inheritance hierarchy to be as general as possible. Derived classes inherit, and can reuse and extend methods from base classes. Be generous in defining data types to avoid difficult changes later on.
Source: download.microsoft.com
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