What does the "Point?" stand for?

Asked Nov 01 '14 at 11:57

Active Nov 01 '14 at 11:57

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I have a quick question:

While looking for a way to paint over picture boxes I found acode that helped me, but I'm confused by this bit:

private Point? _previous = null;

What does the "?" stand for? And why there is "_" before the name, is it because "previous" is already used as a name by basic commands?

Thank you for answers.

asked Nov 01 '14 at 11:57

NagashTDN

3

It means `Nullable`. It is equavalent to `Nullable` – Soner Gönül Nov 01 '14 at 11:58
1

Thank you, I didn't know what to put in google to search for this :) – NagashTDN Nov 01 '14 at 12:02
1

And the underscore is just a convention... it doesn't _have_ to be there. Some people use it for private variables, especially when there's a public property with a getter/setter that uses that private variable. – Grant Winney Nov 01 '14 at 12:03

0 Answers0