Solved

VB.net (v.1) Resizing multidimensional array

Posted on 2007-03-21
3
339 Views
Last Modified: 2013-11-07
I have a 2D array, to get...

Row      Element1      Element2
0      Hello            World

I use this code...

Dim ar(,) As String = New String(0, 1) {}
ar(0, 0) = "Hello"
ar(0, 1) = "World"




But if I want an unknown number of rows at run time, say 3...

Row      Element1      Element2
0      Hello            World
1      Hello            World
2      Hello            World      

What code do I use? How do I start with an empty array size, then ReDim Preserve for each time I need to add another row? Or is there another way of resizing by 1 whilst preserving the data. I do need two elements (Columns).
0
Comment
Question by:IvanHowarth
  • 2
3 Comments
 
LVL 67

Expert Comment

by:sirbounty
ID: 18763798
you'll only be able to redim the rightmost dimension.

As an example...

Dim ar(1,0) As String
ar(0,0) = "Hello"
ar(1,0)="World"

Dim x As Int16=1
Redim Preserve ar(1,x) 'add a row
ar(0,x)="Hello"
ar(1,x)="World

x=2
Redim Preserve ar(1,x) 'add a row
ar(0,x)="Hello"
ar(1,x)="World
0
 
LVL 25

Accepted Solution

by:
dstanley9 earned 500 total points
ID: 18764630
For an unknown number of rows, use an ArrayList.  If your column size is fixed, you can use:

Dim ar As ArrayList = New ArrayList();
ar(0) = new string(2) {"Hello", "World"}
ar(1) = new string(2) {"Hello", "World"}

Unfortunately ArrayList is not type-safe, so you will have to cast each item to a string array:

String() item = CType(ar(0),String())
string vol2 = item(1)

0
 
LVL 67

Expert Comment

by:sirbounty
ID: 18765085
no love... :(
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

It’s quite interesting for me as I worked with Excel using vb.net for some time. Here are some topics which I know want to share with others whom this might help. First of all if you are working with Excel then you need to Download the Following …
The ECB site provides FX rates for major currencies since its inception in 1999 in the form of an XML feed. The files have the following format (reducted for brevity) (CODE) There are three files available HERE (http://www.ecb.europa.eu/stats/exch…
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…

785 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question