Should Class Helpers be used in developing new code?

Question

Delphi 8 introduced Class Helpers for the purposes of mapping the VCL/RTL to the .NET object hierarchy. They allow injecting methods into an existing class without overriding t

Answer 1

These sound like C# extension methods. I would say that while extension methods like these are useful when you don't have the ability to modify a class that you need to extend with functionality, they are a poor way to design your own code. When designing your own code, you'd like all the functionality to be located in the same code file as much as possible rather than spread across different classes. I'd say use them for what they were intended for -- basically as decorators to add new functionality to closed classes -- and don't use them in designing your own code.