It's a C# shortcut for System.Nullable <Point>
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Re: A strange ? syntax
On Thu, 21 Aug 2008 11:01:29 -0700, qualitychecker@ free.fr
<qualitychecker @free.frwrote:
I agree that because of the character being used, it can be difficult toOn 21 août, 19:10, "Peter Morris" <mrpmorri...@SP AMgmail.comwrot e:>>It's a C# shortcut for System.Nullable <Point>
Thanks for this quick answer. Where is this defined ? Not found in
Microsoft docs "C Sharp language specification V1.2 nor V3.0" ?
Is there other special notations like this ?
find the answer using regular search engines. That is indeed
unfortunate. However, it's not true that it's not found in the
documentation or the specification. From the C# 3.0 specification (page
5, "Introduction") :
For each non-nullable value type T there
is a corresponding nullable type T?, which
can hold an additional value "null".
And in 4.1.10 "Nullable Types":
A nullable type is written T?, where T is the
underlying type. This syntax is shorthand for
System.Nullable <T>, and the two forms can be
used interchangeably .
Once you know what it is, it's simple enough to find the MSDN page in the
C# programming guide where it's described. From
http://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx :
The syntax T? is shorthand for Nullable(T),
where T is a value type. The two forms are
interchangeable .
Hope that helps.
Pete
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