Resize an array [,] or an array [][]

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Hello guys,

If I resize an array doing this (e.g.):

String names[] = new String [1];
int numberofnames = 8;

Array.Resize(ref names, numberofnames);

How can I do for an array with more than one dimension?:

//first column for names, second for places
String namesplaces[,] = new String[1,2];

I want to change the array to a new dimension such as [10,2] or even [20,5]; I mean, any number of rows and columns.

I ONLY want a .NET function just like the 'Array.Resize' given above... ¿Does it exist? Thanks

Posted 22-Feb-11 10:06am

pancho2413

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2 solutions

Solution 1

private void ResizeArray(ref string[,] original, int cols, int rows)
{
    //create a new 2 dimensional array with
    //the size we want
    string[,] newArray = new string[rows, cols];
    //copy the contents of the old array to the new one
    Array.Copy(original, newArray, original.Length);
    //set the original to the new array
    original = newArray;
}


// so this resizes the array to 10 columns and 2 rows..
ResizeArray(list,10,2);

hmm sorry :) I didnt read your last sentence so answer to it you may use;

System.Collections.ArrayList class, which is a one-dimensional array that resizes itself. If you have an ArrayList whose elements were all ArrayLists, that will work as a multidimensional, so then it will automatically resize the array.

Posted 22-Feb-11 10:15am

Orcun Iyigun

Updated 22-Feb-11 10:21am

v2

Comments

Sergey Alexandrovich Kryukov 22-Feb-11 16:18pm

I personally agree, but as OP asks _only_ about available analog of Array.Resize, this is not an answer. See my answer, for that matter.
Anyway, 5 from me.
--SA

Orcun Iyigun 22-Feb-11 16:23pm

Yes you are right :) I have read it and updated it but still, it might not fully cover what OP wants.

pancho2413 22-Feb-11 16:43pm

Hahaha easy guys. Thanks for helping me, I appreciate it a lot :-D. Hard to decide who won :-P

Orcun Iyigun 22-Feb-11 17:48pm

it is not about winnig we are just trying to help :) SA always has good answers.

pancho2413 22-Feb-11 18:15pm

All of you won from my point of view. You help people just because you feel good doing it, I offer the same too. I really, really thank you all.

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-02-22T10:16:00

Solution 2

It does not exist.

You can implement such function yourself for array of fixed dimension, but I'm not explaining how, because you probably know and ask only about what you asked. Also, such function would be slow.

You could use regular Array.Resize for jagged arrays (like string[][]), but I'm not explaining how, because you probably know and ask only about what you asked. By the same reason, I'm not explaining how to use collections like System.Collections.Generic.List.

—SA

Posted 22-Feb-11 10:16am

Sergey Alexandrovich Kryukov

Comments

pancho2413 22-Feb-11 16:54pm

I think you wrote the correct answer. I know how to implement it as a function but I was wondering about the existence of a .net function I was missing. BUT you helped me with that System.Collections.Generic.List. Thanks

Sergey Alexandrovich Kryukov 22-Feb-11 17:48pm

You're welcome. (Please see other containers from System.Collections.Generic, most of them are critically important.)
Thanks for accepting my Answer.
Good luck, call again.
--SA

jfriedman 22-Feb-11 18:03pm

Very nice answer SA, beautiful response & beautiful analyzation of the question. You have forced me to rethink the way I answer questions in general.

Reguards,
Julius

Sergey Alexandrovich Kryukov 22-Feb-11 18:36pm

Really? Thank you very much.
What's wrong with your Answers (may be I should rethink mine... :-).
--SA

pancho2413 22-Feb-11 18:17pm

Sure, jfriedman is right. And I was looking for people who answer exactly what I ask :-D

Sergey Alexandrovich Kryukov 22-Feb-11 18:32pm

I appreciate your response and thank you for accepting my Answer.
At the same time I would notice that your communication style (like your shouting "ONLY") sometimes can be perceived as some arrogance. Personally by me, though, it's fine; I just put a nit of irony in my Answer.
Cheers,
--SA