[RESOLVED] Variable Declaration Question

[MMock]

May I ask exactly what this means: bool? bSendEmail ?

I was getting an error from the compiler complaining of my use of an unassigned local variable if I just declared it as bool bSendEmail. I could not find where it wasn't being assigned. I was not sure if I wanted to initialize it to true or to false. The above made the compiler happy, but confused me.

Thanks.

[techgnome]

bool? means it's a nullable boolean... as opposed to bool which isn't nullable.
In VB it would be
Dim ridesBusToWork3 As Nullable(Of Boolean)

More info -
C# - http://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx
VB - http://msdn.microsoft.com/en-us/library/ms235245.aspx

-tg

[MMock]

Cool (and thanks for the quick reply).

So the compiler has intialized it to null for me, and that is why it doesn't complain anymore that it's unassigned?
A Nullable<bool> can be assigned the values true false, or null

[techgnome]

yup... because now null becomes a valid "value" for it.

-tg

[David Anton]

A sidenote - in VB you can also use the '?' syntax:
Dim b As Boolean?
or
Dim b? As Boolean
or
Dim b As Nullable(Of Boolean)