Extension Properties? (DotNet)

I was just wondering...

Its been allready a while since extension methods have been introduced. Hence, many of us hardly actively remember not having those methods available to us.

But I was wondering:

• Where are the extension properties?
• Do extension methods go against the Object Orentation principles?

What do you think?

EventHandler serializable?

I really can't think of any good explanation why the EventHandler Generic is marked as serializable.

Sure I can think of exotic situations where this can be usefull but it would make more sence to mark the individual eventhandlers as serializable in those rear situations where when you need them to be serializable.

There must be a good reason for it I am sure, but I still haven't found it.

Do you know any? Let me know!