Summary

VLF Windows Application Development

Summary

VFW106 – Using a List Collection

Important Observations

  • Unlike fields which, once defined, are persistent for the lifespan of a component, components defined within a routine only exist for the duration of the routine. This is a very useful technique that saves you having to remember to reset variables each time a routine is run.
  • Defining methods such as SelectionChanged adds much greater clarity to your code. Furthermore, the method can be invoked by other components.

Tips & Techniques

  • List Collections can collect any type (or Class) of Visual LANSA object.
  • You would typically use Keyed Collections of Style Collection when you are collecting objects.
  • You can pass a reference to an entire collection to another form or reusable component.

What You Should Know

  • How to pass a reference to an entire collection.