Expandable array

[Simon Johnson]

In c# is it possible to resize an array cleanly?

My application is that I have a list of numbers i'd like to return from a
method as an integer array. I don't know before hand how many integers i'm
going to have.

Simon.

[Jan Tielens]

Hi

In this scenario I usually use an ArrayList to easily build the array. Once
finished, I use the ToArray method to get a real Array:

System.Collections.ArrayList al = new System.Collections.ArrayList();
al.Add(3);
al.Add(5);
///...
return al.ToArray(typeof(int));

--
Greetz

Jan Tielens
________________________________
Read my weblog: http://weblogs.asp.net/jan
"Simon Johnson" <ck***@hotmail.com> wrote in message
news:br**********@titan.btinternet.com...

In c# is it possible to resize an array cleanly?

My application is that I have a list of numbers i'd like to return from a
method as an integer array. I don't know before hand how many integers i'm
going to have.

Simon.

[Simon Johnson]

Perfect, Thanks..

Simon.

[Eric Newton]

Good solution. You'll begin to take a boxing hit if the list becomes >50
items, since ArrayList stores as object type.

If its gonna be loading a lot of integers then I'd recommend building a
class for managing a int[] for efficiency reasons if this is gonna be a hard
hit area.

/me looks forward to C# generics ;-)

--
Eric Newton
C#/ASP Application Developer
http://ensoft-software.com/
er**@cc.ensoft-software.com [remove the first "CC."]

"Jan Tielens" <ja*@no.spam.please.leadit.be> wrote in message
news:Oh**************@TK2MSFTNGP10.phx.gbl...

Hi

In this scenario I usually use an ArrayList to easily build the array. Once finished, I use the ToArray method to get a real Array:

System.Collections.ArrayList al = new System.Collections.ArrayList();
al.Add(3);
al.Add(5);
///...
return al.ToArray(typeof(int));

--
Greetz

Jan Tielens
________________________________
Read my weblog: http://weblogs.asp.net/jan
"Simon Johnson" <ck***@hotmail.com> wrote in message
news:br**********@titan.btinternet.com...

In c# is it possible to resize an array cleanly?

My application is that I have a list of numbers i'd like to return from a method as an integer array. I don't know before hand how many integers i'm going to have.

Simon.

[Jan Tielens]

Eric

I agree, generics will be so cool in these scenarios...

--
Greetz,
Jan
__________________________________
Read my weblog: http://weblogs.asp.net/jan
"Eric Newton" <er**@cc.ensoft-software.com> schreef in bericht
news:uR**************@TK2MSFTNGP11.phx.gbl...

Good solution. You'll begin to take a boxing hit if the list becomes >50
items, since ArrayList stores as object type.

If its gonna be loading a lot of integers then I'd recommend building a
class for managing a int[] for efficiency reasons if this is gonna be a hard hit area.

/me looks forward to C# generics ;-)

--
Eric Newton
C#/ASP Application Developer
http://ensoft-software.com/
er**@cc.ensoft-software.com [remove the first "CC."]

"Jan Tielens" <ja*@no.spam.please.leadit.be> wrote in message
news:Oh**************@TK2MSFTNGP10.phx.gbl...

Hi

In this scenario I usually use an ArrayList to easily build the array. Once

finished, I use the ToArray method to get a real Array:

System.Collections.ArrayList al = new System.Collections.ArrayList();
al.Add(3);
al.Add(5);
///...
return al.ToArray(typeof(int));

--
Greetz

Jan Tielens
________________________________
Read my weblog: http://weblogs.asp.net/jan
"Simon Johnson" <ck***@hotmail.com> wrote in message
news:br**********@titan.btinternet.com...

In c# is it possible to resize an array cleanly?

My application is that I have a list of numbers i'd like to return

from a method as an integer array. I don't know before hand how many integers i'm going to have.

Simon.

[Jon Skeet [C# MVP]]

Eric Newton <er**@cc.ensoft-software.com> wrote:

Good solution. You'll begin to take a boxing hit if the list becomes >50
items, since ArrayList stores as object type.

If its gonna be loading a lot of integers then I'd recommend building a
class for managing a int[] for efficiency reasons if this is gonna be a hard
hit area.

/me looks forward to C# generics ;-)

While generics will indeed be very handy here, I certainly wouldn't
start writing my own type to deal with this kind of thing unless I'd
already determined that the boxing hit was actually causing a problem.
Premature optimisation is a bad idea, IMO.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too