What is the purpose of <List<T>?>

[jessethepro]

I do not understand the use of the "?" operator in this context.

Thanks,
Jesse

 

[Skydiver]

The question mark is not an operator in that context. It is an annotation indicating that a null reference to a List<T> is valid. It is syntactic sugar for Nullable<List<T>>.

It is the same as the case of a int? is basically Nullable<int>.

 

[jessethepro]

Ahh Thank you. I could see the Null reference in the documentation but given its position it was hard to tell which object could be null.