default(Nullable(type)) vs default(type)

Question

In C#, is there a difference between default(Nullable<long>) (or default(long?)) and default(long) ?

Long is just an example, it can be any other struct type.

Ye...you're right. I'm not at a compiler though...so I thought to ask. Will test these in the future rather than ask...question can be deleted if moderator wants. — Eugene, Oct 12 '11 at 00:54
Still, I think the community can agree that it is useful to have even the most simple questions answered so that instead of 30, it takes no longer than 5 seconds to resolve a query (at least for the rest of us). — Marco Toniut, Sep 22 '13 at 15:54

score 50 · Accepted Answer · answered Oct 12 '11 at 00:46

Well yes. The default value of a nullable or other reference type is null while the default value for a long or other value type is 0 (and any other members set to their defaults).

In this case:

default(Nullable<long>) == null
default(long?) == null

default(long) == 0L

default(Nullable(type)) vs default(type)

1 Answers1