Re: Newbie - delete item from collection

That's true for Arrays as the compiler 'knows' that .Length won't change
during the enumeration. 
Everything else will have its Count re-evaluated during each loop.

Cheers
Simon 

-----Original Message-----
From: Discussion of advanced .NET topics.
[mailto:[email protected]] On Behalf Of Geoff Taylor
Sent: 18 November 2008 10:20
To: [email protected]
Subject: Re: [ADVANCED-DOTNET] Newbie - delete item from collection

I know it's a property.  Tsk. ;)

My confusion was around it being whether it was invoked in the loop at
all.
I was under the impression - I'm sure I read this somewhere back in the
.NET 1.0 or beta days - that a for loop like:

for (int i = 0; i < list.Count; i++)
{
    ...
}

Was created in the IL as:

int temp = list.Count;
for (int i = 0; i < temp; i++)
{
    ...
}

See what I mean now?

I can't find any reference to this behaviour though, and I've just read
the relevant parts of the C# Language Specification and it's not there.
I even wrote it a simple program in Snippet Compiler to check.  So it
looks like my understanding was hogswash.  Sorry about that.

Apologies for introducing confusion.  Now, any idea where I got that
notion?

Cheers,

			Geoff

> -----Original Message-----
> From: Discussion of advanced .NET topics. [mailto:ADVANCED- 
> [email protected]] On Behalf Of Eddie Lascu
> Sent: 17 November 2008 22:23
> To: [email protected]
> Subject: Re: [ADVANCED-DOTNET] Newbie - delete item from collection
> 
> Count is a property that returns the actual number of elements 
> contained in the ArrayList so has to be reevaluated every time is 
> invoked.
> 
> -----Original Message-----
> From: Discussion of advanced .NET topics.
> [mailto:[email protected]] On Behalf Of Geoff 
> Taylor
> Sent: Monday, November 17, 2008 5:06 PM
> To: [email protected]
> Subject: Re: [ADVANCED-DOTNET] Newbie - delete item from collection
> 
> Really? I thought that was cached before the first iteration of the 
> loop and not re-evaluated. Does it really evaluated Count each time 
> through the loop?
> 
>      Geoff
> 
> On 17 Nov 2008, at 21:04, Chris Anderson <[email protected]> wrote:
> 
> >> (I'd also have expected it to throw an exception towards the end, 
> >> because there are no longer _someList.Count items in the list.)
> >
> > Yes there are ;-)
> > _someList.Count will be decrementing as you remove items
> >
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