c# Casting v As operator

[Mike Hankey]

I used to use A (C upbringing) now I kinda favor B.

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[PIEBALDconsult]

Depends on the situation. Mostly proper casting, as occasionally, particularly when checking for a derived type.

[Nagy Vilmos]

Don't mind if I do. :beer: yourself.

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[Sahir Shah]

Norm .net wrote:

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Too much hand is bad for the eye.

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[PIEBALDconsult]

I use A and never get an Exception, what are you people doing? :confused:

[Nemanja Trifunovic]

PIEBALDconsult wrote:

what are you people doing?

SomeType obj = (SomeType)BloatedUglyUnreadableFrameworkFactory.CreateObject(someXMLStringThatIHopeWorksSometimesButNeverKnowForSure);

utf8-cpp

[Ennis Ray Lynch Jr]

As is for poor programmers. If you know that e always is SomeObject then e should be typed as such using some other method. Otherwise you always have to check the result of the as operation. So then you have the following two scenarios which must always be in case A or case B:

if(e is SomeObject){
SomeObject someObject = (SomeObject)e;
}

or

SomeObject someobject = e as SomeObject;
if(someObject != null){

}

But then in case by I always here the response ... but I know e is always SomeObject. Really then maybe it should be defined as such. The AS operator is designed solely to support developers that don't have a fundamental concept of type. After all, for all of the time I have seen the is operator used with a subsequent cast, checking for null after the AS is a white rhinoceros.

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[peterchen]

The first when I need the exception, the second when I need the null. Because face it, e is never what you need it to be.

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[Pete OHanlon]

Thanks Ennis - I'm a poor programmer then because I use as, rather than the double cast, which is doing the same work again. What happens internally with as is that it checks to see if the variable is of the type, and if it is it returns a non-null pointer to that type. With the is operator, you check to see if it is of the type and then you cast it - which still determines internally whether or not it belongs to that type (this is how it throws an InvalidTypeException). In any case where you are using code-discovery, such as IoC, then the as call is more efficient. [Edit]I should add that this relates to our plugin code where the client provides their own logic, and "forgets" to implement the appropriate interfaces.[/Edit]

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modified on Thursday, June 23, 2011 9:30 AM

[Pete OHanlon]

You have better clients than we do then. You tell them, you must implement this interface in order for this to work, and bam they completely fail to implement the interface.

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[Lost User]

peterchen wrote:

Because face it, e is never what you need it to be.

Not according to Pompey's review of his day at the races.

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[Sahir Shah]

Somebody didn't read the subject of the post.

Und wenn du lange in einen abgrund blickst, blickt der Abgrund auch in dich hinein.

[Jim Crafton]

You've been reading java code on the throne again haven't you? :)

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[NormDroid]

:wtf: are you going on about.

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[hairy_hats]

I seem to have upset some voters along the way. :-D

[hairy_hats]

Sahir seems to be comparing C# casts with a handler of equine animals.

[GenJerDan]

Not that there's anything wrong with that.

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[NormDroid]

:) Indeed, at this rate he's going to hit an exception that he may not like.

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[CPallini]

I prefer directly throwing. :)

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[Sahir Shah]

Well in brief, if you are in the shower and drop the soap and there is an operator mentioned in the subject line around, there is a good chance he might be a hominid. I wouldn't advise you to try and pick up the soap.

Und wenn du lange in einen abgrund blickst, blickt der Abgrund auch in dich hinein.