Solved

VB.net - 2D array with double, System.Collections.Generic.List

Posted on 2007-03-19
1
2,836 Views
Last Modified: 2007-12-19
Hi

I've got a  System.Collections.Generic.List but now want 4 of these in a 2D array
e.g.
0, System.Collections.Generic.List
1,  System.Collections.Generic.List
2,  System.Collections.Generic.List
3,  System.Collections.Generic.List

so they can be accessed by ID instead of having 4  System.Collections.Generic.List with different variable names

How is this declared/updated? Thanks
0
Comment
Question by:rwallacej
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 1

Accepted Solution

by:
xldev earned 500 total points
ID: 18746962
Well an array can not have multiple types so a 2D array with double, List will not work.

You can just have a single-dimensional array of System.Collections.Generic.List then access them with the array index like so:

        'Declare your array of generic lists
        Dim arr(4) As System.Collections.Generic.List(Of Object)

        'Add your generic lists to the array
        arr(0) = New System.Collections.Generic.List(Of Object)
        arr(1) = New System.Collections.Generic.List(Of Object)
        arr(2) = New System.Collections.Generic.List(Of Object)
        arr(3) = New System.Collections.Generic.List(Of Object)

        'Access the lists through the array using the array index
        arr(0).Add("First generic list value.")
        arr(0).Add("First generic list 2nd value.")
        arr(1).Add("Second generic list value.")

        'Update list values using the array index and the list index
        arr(0)(0) = "Change the value."
        arr(0)(1) = "Change the 2nd value."

        'Access the list values in the same way
        MessageBox.Show(arr(0)(1).ToString())

Let me know if that is what you are looking for.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

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

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…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

738 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