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GUI for .NET Programming
Accessing and Managing .NET Classes from ABL : Defining ABL-extended .NET objects
 

Defining ABL-extended .NET objects

You can extend a .NET class with an ABL class much as you can extend another ABL class—by inheriting a .NET class or by implementing a .NET interface in the ABL class definition. As such, an ABL-derived .NET class is an ABL user-defined class that inherits from a .NET class. An ABL-extended .NET class is an ABL user-defined class that either inherits from a .NET class, implements a .NET interface, or both. Thus, the possible set of ABL-extended .NET classes represent a proper super set of the possible set of ABL-derived .NET classes. No matter how you define an ABL-extended .NET class, any instance of that class is accessible from both the ABL context and the .NET context of a single ABL session (see GUI for .NET run-time architecture).
The following sections describe how to define and use ABL-extended .NET classes, both by inheriting .NET classes and implementing .NET interfaces:
*Features of ABL-derived .NET classes
*Deriving .NET classes in ABL
*Managing events for ABL-derived .NET classes
*Features of ABL classes that implement .NET interfaces
*Implementing .NET interfaces in ABL
*Error handling for ABL-extended .NET classes
* Features of ABL-derived .NET classes
* Deriving .NET classes in ABL
* Managing events for ABL-derived .NET classes
* Features of ABL classes that implement .NET interfaces
* Implementing .NET interfaces in ABL
* Error handling for ABL-extended .NET classes