How to use single result in While Loop?

Question

Well, my titling is a bit weird I guess. But let me explain my question.

I have a while loop

while( GetObj() == null || !GetObj().Initialized ){
    doStuff();
}

It would be neat when GetObj() isn't called twice per loop.

I've debugged it in another project to be sure that .NET do not avoid calling the method twice. But that isn't the case.

My actual question now is
Is there a simple way, to avoid calling GetObj() twice in my loop condition?

Why can't you just put it outside the loop and save it in a variable or something? — Arian Motamedi
– Arian Motamedi, Commented Aug 8, 2014 at 21:29

merlin2011 · Accepted Answer · 2014-08-08 21:31:02Z

6

This form is less concise, but possibly more readable.

var obj = GetObj();
while(obj  == null || !obj.Initialized ){
    doStuff();
    obj = GetObj();
}

answered Aug 8, 2014 at 21:31

merlin2011

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3 Comments

boop Over a year ago

Is there any (unless the syntax of course) difference to @marcel-n 's answer? I'm wondering since this one gets upvotes and the other one not a single one?

merlin2011 Over a year ago

@Brettetete, One difference is that I answered several minutes earlier, so his answer looks like a duplicate. Normally duplicate answers do not get upvoted. This happens less if the answers are within seconds of each other.

user2527098 Over a year ago

@Brettetete Also his answer doesn't have the same logic as is in your question.

user2527098 · Accepted Answer · 2014-08-08 21:31:00Z

2

I believe this will help:

YourObject obj ;
while((obj = GetObj()) == null || !obj.Initialized) {
    doStuff();
}

answered Aug 8, 2014 at 21:31

user2527098

Comments

pollirrata · Accepted Answer · 2014-08-08 21:29:59Z

1

Maybe

var obj = GetObj();

while( obj == null || !obj.Initialized ){
    doStuff();
}

answered Aug 8, 2014 at 21:29

pollirrata

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1 Comment

Marcel N. Over a year ago

Needs to be inside the while loop, as GetObj might change (most likely does).

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