Question: arraylist and item

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  • Start date Start date
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Guest

i have a arraylist that look like this

item 0 - hold this value 1,2,4
item 1 - hold this value 3,6,7

if i want to access the item 0 i get the whole 1,2,4 how do i seperate them
out like i want "1" how do i access item 0 but the first value "1".

thank
 
so you have a variable you want to hold like 1,5,7? try a multi-demensional
arry


Private arrNumbers(,) As Integer = {{5, 6, 6}, _
{8, 9, 10}}

hope that helps
 
dotnetnoob said:
i have a arraylist that look like this

item 0 - hold this value 1,2,4
item 1 - hold this value 3,6,7

if i want to access the item 0 i get the whole 1,2,4 how do i seperate them
out like i want "1" how do i access item 0 but the first value "1".

thank
Click to expand...

Well... The only way really to do that is to store this as either an
arraylist of arraylists, or an arraylist of arrays. I would suggest
the latter if the individual elements are fixed length. Then you could
do something like (Assuming 2003 - if your useing 2005, then you could
improve the following using generics):

Option Strict On
Option Explicit On

Imports System
Imports System.Collections

Module Module1

Sub Main()
Dim list As New ArrayList

list.Add(New Integer() {1, 2, 3})
list.Add(New Integer() {5, 6, 7})
list.Add(New Integer() {7, 15, 25})
list.Add(New Integer() {8, 27, 10})

Console.WriteLine(DirectCast(list(3), Integer())(1))

End Sub

End Module

The above prints 27.
 
it's not exactly what i'm looking for but i got it. basically, i'm going to
treate it as string and get the character out of the string in the arraylist
 
dotnetnoob said:
i have a arraylist that look like this

item 0 - hold this value 1,2,4
item 1 - hold this value 3,6,7

if i want to access the item 0 i get the whole 1,2,4 how do i seperate them
out like i want "1" how do i access item 0 but the first value "1".

thank
Click to expand...

You could do this several ways. One option is to create a structure and
use that for your items:

--------------------------------
Public Structure DataItem
Dim value1 as Integer
Dim value2 as Integer
Dim value3 as Integer
End Structure
--------------------------------

For each item that you have, you could create a new DataItem and assign
the values appropriately. Using the values from your example above:

--------------------------------
Dim newItem as new DataItem
newItem.value1 = 1
newItem.value2 = 2
newItem.value3 = 4
--------------------------------

After you've created DataItems for all of the data, you could put them
into an array of type DataItem like so:

--------------------------------------------------
Dim DataItems as DataItem() = {var1,var2,var3,...}
--------------------------------------------------

or add them to an ArrayList. If you use an arraylist, you'll most
likely have to cast the object to type DataItem to access the
..value1,.value2,.value3 items.

A structure is a simple form, you could always create a class to hold
the data, and instantiate the values in a constructor.

Hope this Helps
 
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