increase the size of the array

[reb]

Hi,

How do i increase the size of the array without losing the
data of that array in c#?

thanks

[Günter Prossliner]

Use an ArrayList. Arrays always are fixed - size in C#

GP

"reb" <gb***@yahoo.co m> wrote in message
news:0b******** *************** *****@phx.gbl.. .

Hi,

How do i increase the size of the array without losing the
data of that array in c#?

thanks

[Lee Alexander]

Just to add the other way to do it is to reallocate the array to the new
size and copy the old arrays contents into the new one. Saying that I would
use the ArrayList approach anyway in a situation where I don't know the
number of elements in advance. If you have then finished the operation of
adding items to it then you can *convert* the ArrayList into a strongly type
array like so:

AType items[] =(AType[]) myArrayList.ToA rray( typeof( AType ) );

Regards
Lee
"Günter Prossliner" <g.**********@g mx.at> wrote in message
news:OO******** ******@TK2MSFTN GP12.phx.gbl...

Use an ArrayList. Arrays always are fixed - size in C#

GP

"reb" <gb***@yahoo.co m> wrote in message
news:0b******** *************** *****@phx.gbl.. .

Hi,

How do i increase the size of the array without losing the
data of that array in c#?

thanks

[Günter Prossliner]

If you do this with small arrays, it's ok (I also do this in that case), but
if the Array rows image that the elements must be copied on each call. In
this case it would be better to use an ArrayList (or an own, strong typed,
collectionclass )

GP

"Lee Alexander" <lee@No_Spam_Pl ease_Digita.com > wrote in message
news:%2******** *******@TK2MSFT NGP09.phx.gbl.. .

Just to add the other way to do it is to reallocate the array to the new
size and copy the old arrays contents into the new one. Saying that I would use the ArrayList approach anyway in a situation where I don't know the
number of elements in advance. If you have then finished the operation of
adding items to it then you can *convert* the ArrayList into a strongly type array like so:

AType items[] =(AType[]) myArrayList.ToA rray( typeof( AType ) );

Regards
Lee
"Günter Prossliner" <g.**********@g mx.at> wrote in message
news:OO******** ******@TK2MSFTN GP12.phx.gbl...

Use an ArrayList. Arrays always are fixed - size in C#

GP

"reb" <gb***@yahoo.co m> wrote in message
news:0b******** *************** *****@phx.gbl.. .

Hi,

How do i increase the size of the array without losing the
data of that array in c#?

thanks

[Lee Alexander]

I guess the trouble is though what is the definition of small? I would err
on the side of type safety and only if a performance was shown to be a
problem would I consider an ArrayList being exposed. I know what you mean
though :-)

Regards
Lee
"Günter Prossliner" <g.**********@g mx.at> wrote in message
news:uh******** ********@TK2MSF TNGP10.phx.gbl. ..

If you do this with small arrays, it's ok (I also do this in that case), but if the Array rows image that the elements must be copied on each call. In
this case it would be better to use an ArrayList (or an own, strong typed,
collectionclass )

GP

"Lee Alexander" <lee@No_Spam_Pl ease_Digita.com > wrote in message
news:%2******** *******@TK2MSFT NGP09.phx.gbl.. .

Just to add the other way to do it is to reallocate the array to the new
size and copy the old arrays contents into the new one. Saying that I

would

use the ArrayList approach anyway in a situation where I don't know the
number of elements in advance. If you have then finished the operation of adding items to it then you can *convert* the ArrayList into a strongly

type

array like so:

AType items[] =(AType[]) myArrayList.ToA rray( typeof( AType ) );

Regards
Lee
"Günter Prossliner" <g.**********@g mx.at> wrote in message
news:OO******** ******@TK2MSFTN GP12.phx.gbl...

Use an ArrayList. Arrays always are fixed - size in C#

GP

"reb" <gb***@yahoo.co m> wrote in message
news:0b******** *************** *****@phx.gbl.. .
> Hi,
>
> How do i increase the size of the array without losing the
> data of that array in c#?
>
> thanks

[Günter Prossliner]

Of caurse, what means small? But image following code:

class MyClass{
string[] lines;

public MyClass(Stream content){

StreamReader sr = new StreamReader(co ntent);

for(string line=sr.ReadLin e(); line != null; line=sr.ReadLin e())
AddLine(line);

sr.Close();
}

public void AddLine(string line){
stirng[] copy = new string[lines.lenght];
lines.CopyTo(co py,0);
copy[lines.lenght] = line;
lines = copy;
}
}

If you would read a file line-by-line into this class, it would not perform
good. In this case it would be better to use an ArrayList, but here it would
be ok:

class MyClass2{
string[] lines;

public MyClass2(Stream content){
ArrayList al = new ArrayList();
StreamReader sr = new StreamReader(co ntent);

for(string line=sr.ReadLin e(); line != null; line=sr.ReadLin e())
al.Add(line);

sr.Close();

lines = (string[])(al.ToArray(ty peof(string)));
}
}

It will be executed only once.
GP

"Lee Alexander" <lee@No_Spam_Pl ease_Digita.com > wrote in message
news:uE******** ******@TK2MSFTN GP10.phx.gbl...

I guess the trouble is though what is the definition of small? I would err
on the side of type safety and only if a performance was shown to be a
problem would I consider an ArrayList being exposed. I know what you mean
though :-)

Regards
Lee
"Günter Prossliner" <g.**********@g mx.at> wrote in message
news:uh******** ********@TK2MSF TNGP10.phx.gbl. ..

If you do this with small arrays, it's ok (I also do this in that case),

but

if the Array rows image that the elements must be copied on each call. In

this case it would be better to use an ArrayList (or an own, strong typed, collectionclass )

GP

"Lee Alexander" <lee@No_Spam_Pl ease_Digita.com > wrote in message
news:%2******** *******@TK2MSFT NGP09.phx.gbl.. .

Just to add the other way to do it is to reallocate the array to the new size and copy the old arrays contents into the new one. Saying that I

would

use the ArrayList approach anyway in a situation where I don't know the number of elements in advance. If you have then finished the operation of adding items to it then you can *convert* the ArrayList into a

strongly type

array like so:

AType items[] =(AType[]) myArrayList.ToA rray( typeof( AType ) );

Regards
Lee
"Günter Prossliner" <g.**********@g mx.at> wrote in message
news:OO******** ******@TK2MSFTN GP12.phx.gbl...
> Use an ArrayList. Arrays always are fixed - size in C#
>
> GP
>
> "reb" <gb***@yahoo.co m> wrote in message
> news:0b******** *************** *****@phx.gbl.. .
> > Hi,
> >
> > How do i increase the size of the array without losing the
> > data of that array in c#?
> >
> > thanks
>
>

[Lee Alexander]

I totally agree with you that's why I said in my original post:

"Saying that I would use the ArrayList approach anyway in a situation where
I don't know the
number of elements in advance"

Regards
Lee
"Günter Prossliner" <g.**********@g mx.at> wrote in message
news:eE******** ******@TK2MSFTN GP12.phx.gbl...

Of caurse, what means small? But image following code:

class MyClass{
string[] lines;

public MyClass(Stream content){

StreamReader sr = new StreamReader(co ntent);

for(string line=sr.ReadLin e(); line != null; line=sr.ReadLin e())
AddLine(line);

sr.Close();
}

public void AddLine(string line){
stirng[] copy = new string[lines.lenght];
lines.CopyTo(co py,0);
copy[lines.lenght] = line;
lines = copy;
}
}

If you would read a file line-by-line into this class, it would not perform good. In this case it would be better to use an ArrayList, but here it would be ok:

class MyClass2{
string[] lines;

public MyClass2(Stream content){
ArrayList al = new ArrayList();
StreamReader sr = new StreamReader(co ntent);

for(string line=sr.ReadLin e(); line != null; line=sr.ReadLin e())
al.Add(line);

sr.Close();

lines = (string[])(al.ToArray(ty peof(string)));
}
}

It will be executed only once.
GP

"Lee Alexander" <lee@No_Spam_Pl ease_Digita.com > wrote in message
news:uE******** ******@TK2MSFTN GP10.phx.gbl...

I guess the trouble is though what is the definition of small? I would err

on the side of type safety and only if a performance was shown to be a
problem would I consider an ArrayList being exposed. I know what you mean though :-)

Regards
Lee
"Günter Prossliner" <g.**********@g mx.at> wrote in message
news:uh******** ********@TK2MSF TNGP10.phx.gbl. ..

If you do this with small arrays, it's ok (I also do this in that case),

but

if the Array rows image that the elements must be copied on each call. In this case it would be better to use an ArrayList (or an own, strong typed, collectionclass )

GP

"Lee Alexander" <lee@No_Spam_Pl ease_Digita.com > wrote in message
news:%2******** *******@TK2MSFT NGP09.phx.gbl.. .
> Just to add the other way to do it is to reallocate the array to the new > size and copy the old arrays contents into the new one. Saying that

I would
> use the ArrayList approach anyway in a situation where I don't know

the > number of elements in advance. If you have then finished the

operation of

> adding items to it then you can *convert* the ArrayList into a

strongly type
> array like so:
>
> AType items[] =(AType[]) myArrayList.ToA rray( typeof( AType ) );
>
> Regards
> Lee
> "Günter Prossliner" <g.**********@g mx.at> wrote in message
> news:OO******** ******@TK2MSFTN GP12.phx.gbl...
> > Use an ArrayList. Arrays always are fixed - size in C#
> >
> > GP
> >
> > "reb" <gb***@yahoo.co m> wrote in message
> > news:0b******** *************** *****@phx.gbl.. .
> > > Hi,
> > >
> > > How do i increase the size of the array without losing the
> > > data of that array in c#?
> > >
> > > thanks
> >
> >
>
>