DLL and reference it from any other projects you wished to use it for. You would have to compile the project into its own. Custom ControlsĬreating new visual controls used to involve creating a new project based on the ActiveX Control Project templates. This makes it trivial to templatize your application changes to the new generic base form automatically cascade to the derived classes at the next build. When you derive other classes from this new class, they inherit the visual styles and controls but you can add more specific features. You can create a new class, derived from Form, that specifies a generic layout (perhaps an OK and a Cancel button in the lower-right corner). This opens the door to what many call visual inheritance. Form, in turn, derives from another class,, and so on all the way back to System.Object, which sits at the root of all inheritance chains in. Any new form you create will derive from by default. When you program in WinForms, this difference in inheritance will become immediately apparent. Derived classes can access members of the base class through the MyBase keyword. The subclass inherits not only the method definitions of the base class but also the method implementations along with the properties and data fields. Implementation inheritance allows programmers to derive a class (now the derived class or subclass) from another class (the base class). NET still offers interface inheritance (via the Implements keyword) but also allows for implementation inheritance (via the Inherits keyword). This ability was often the subject of heated debates: Some thought that it was a confusing addition to a straightforward language, whereas others thought that Microsoft didn't go far enough. However, the class was fully responsible for that implementation the interface provided only the method definitions. By implementing an interface, a class was signing a contract and promising to implement the methods contained therein. Interface inheritance offered Visual Basic programmers a way to implement object polymorphism, one of the three pillars of object-oriented programming. Visual Basic 6.0 offered only interface inheritance, which was necessitated by its association with COM. It has a class library from which you build objects that present your application (mostly in the namespace). WinForms is a fully object-oriented approach to building visual applications for Windows. This was especially true of forms themselves it was never clear whether they were classes or objects. However, the model was vague when it came to the visual components of an application. Visual Basic (especially versions 5.0 and 6.0) was a powerful object-oriented development tool. NET Framework dialogs (OpenFileDialog, etc.) Windows applications can be written in Notepad Interface, implementation, and visual inheritance However, there are new features of the Designer as well. Many of the feature changes you most need to know about aren't visual instead, they are the things that happen in the code that you write or that is generated for you as you design and program your application.
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