How do I OOP in Revit API?

[XARMA]

I make a simple test add-in.

It just appear a window that is made by xaml file.

And I have wanted to add some function(Picking Object and window get element ID and appear  that).

I can make some code in Command Class but, I want to learn about using other class.

so I added another class for Picking Object, But How do I write the codes?

Have I to use IExternalCommand or Result Execute? and Where can I get more information about something like that?

[jeremy_tammik · Accepted solution]

To learn OOP, you need to read some basic introductions to the topic. The Revit API is not the best place to start, I'm afraid. Here are some suggestions by Gemini:

• https://g.co/gemini/share/f94485e5f325

[XARMA]

Thank you for your advice