=== operator in c#

surendraparashar · #1 (**permalink**) June 26th, 2007, 01:54 PM

Plese tell me about === operator in c#

Surendra

dparsons · #2 (**permalink**) June 27th, 2007, 06:40 PM

Do you mean the

== operator? That is an equality operator which determines if the value on the left is equal to the value on the right.

I have never seen === as on operator and it doesn't exist on the MSDN page either: http://msdn2.microsoft.com/en-us/library/6a71f45d(VS.80).aspx

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Enslave · #3 (**permalink**) June 28th, 2007, 07:48 AM

=== does exist in i.e php if I'm not mistaken..

dont remember what it does tho =/

Enuff enuff!

C# btw.

Enslave · #4 (**permalink**) June 28th, 2007, 08:00 AM

$a === $b
Identical TRUE if $a is equal to $b, and they are of the same type.
(introduced in PHP 4)

so there :]

-----------
Enuff enuff!

C# btw.

dparsons · #5 (**permalink**) June 28th, 2007, 06:39 PM

So what is it in C# then, do you have a reference to the MSDN perhaps?

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Enslave · #6 (**permalink**) June 29th, 2007, 02:49 AM

I doubt it exists in C# tbh..

http://msdn2.microsoft.com/en-us/library/6a71f45d(vs.71).aspx

didnt find it there atleast

-----------
Enuff enuff!

C# btw.

surendraparashar · #7 (**permalink**) November 6th, 2007, 08:05 AM

Hi,

Okay Fine

Surendra Parashar
Gurgaon, Hariyana
http://www.geocities.com/surendraparashar

weicco · #8 (**permalink**) November 8th, 2007, 04:55 AM

Yes, it is there. See is-operator here

http://msdn2.microsoft.com/en-us/library/scekt9xw.aspx

So what you need to do is something like this:

Code:

object obj1 = 1;
object obj2 = "1";

if (obj1 is obj2 and obj1 == obj2)
{
    // same as obj1 === obj2
}
else
{
    // same as obj1 !== obj2
}

In PHP (and VB without strict option) that would evaluate always as true because of it's sick type casting behaviour.

samjudson · #9 (**permalink**) November 8th, 2007, 05:14 AM

Another option might be the Object.ReferenceEquals method, depending on what you are trying to achieve.

if( Object.ReferenceEquals(obj1, obj2) )
{
// true if obj1 and obj2 are references to the same object.
}

/- Sam Judson : Wrox Technical Editor -/

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