Is it possible to augment an external type without deriving from it?

[rzvc]

Like the title says, I would like to add some properties and methods to an external type that I can't modify directly.

For example:

class Foo
{
}

// <-- How can I specify here that Foo has some extra properties, without touching the main Foo declaration?

[AndrolGenhald]

You can use stubs. Class declarations from stubs get merged with the actual declaration, so you don't need to repeat everything, just add what you need.

[rzvc]

Awesome, thank you.