What does this "int?" means ?

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Hi,

Somewhere in the pre-existing project(VS2008), (the one that i have to maintain ;-[ ), i see some coding as follows:-

C#

public int? GetInt(object p_objValue)
{
}

Here, What does this "int?" means ?

The question mark with "int" is not mentioned by mistake.

HELP !!

Posted 29-Sep-11 0:33am

Updated 29-Sep-11 19:52pm

v3

3 solutions

int? : allow null value and int value
int : allow only int value

for ex :

int? i = null; // it worked
int i = null; // it gives error

Posted 29-Sep-11 19:21pm

Updated 29-Sep-11 19:57pm

v2

int?i, allow you to store null value in i or any other integer value

this is called nullable type.

read more about nullable;

http://www.c-sharpcorner.com/UploadFile/prasoonk/NullableTypeinCSharp06042009092324AM/NullableTypeinCSharp.aspx[^]

Posted 29-Sep-11 19:38pm

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P.Salini · Accepted Answer · 2011-09-29T00:36:00

In your case it represents that the method can return null as value.

int? means, it is a "boxed" integer value. That means. a int? is nullable!

C#

int i1=1; //ok
int i2=null; //not ok
int? i3=1; //ok
int? i4=null; //ok