Re: Casting null to nullable

I came to the same conclusion this morning, while taking my walk, and have
just confirmed this.

> -----Original Message-----
> From: Discussion of development on the .NET platform using any managed
> language [mailto:[email protected]] On Behalf Of Curt
> Hagenlocher
> Sent: 15 November 2007 05:26 PM
> To: [email protected]
> Subject: Re: [DOTNET-CLR] Casting null to nullable
>
> On 11/15/07, Rich Armstrong <[email protected]> wrote:
> >
> > I'm aware of one situation that requires an explicit cast:
> >
> >    // This produces an error "Type of conditional expression
> >    // cannot be determined because there is no implicit conversion
> >    // between 'int' and '<null>'"
> >    int? nullableInt = someCondition ? 0 : null;
> >
> >    // This compiles without error
> >    int? nullableInt = someCondition ? 0 : (int?)null;
>
>
> I'll bet you can also say
> int? nullableInt = someCondition ? (int?)0 : null
>
> The compiler has to be able to find a common type between "0" and
> "null" in
> order to generate code, and apparently it doesn't in this case.  The
> fact
> that the variable declaration is "int?" is a bit of a red herring as
> the
> type of the lhs of the expression is not taken into account when
> evaluating
> the rhs.
>
> --
> Curt Hagenlocher
> [email protected]
>
> ===================================
> This list is hosted by DevelopMentorR  http://www.develop.com
>
> View archives and manage your subscription(s) at
> http://discuss.develop.com

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com