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dynamic arrays in vb.net ?????

Sun, 15 Nov 2009 19:40:07 -0800

im trying to declare an array with an unknown length and no way of figuring it out untill the actual data has been placed within the array, in c++ it possible to fill a dynamic array with data and then find out the length if u need 2, but in vb.net im not sure, i know abt the redim concept, but does it work in this case...

thank u sooo much !!!

Re: dynamic arrays in vb.net ?????

Mon, 16 Nov 2009 06:53:14 -0800

You a few options to solve the scenario you are facing.

Firstly, and more directly to your questions, you can declare the size of an array dynamically like this:

'Say I am getting data from the database, and i don't know how
'many rows I am getting...

'At somepoint, I will get a count for the amount of data coming back, and when I get that 'count' i can declare the array like so:

Dim RowCount as Integer = 15

Dim DynamArray(RowCount) As Integer
'Now DynamArray's bounds are 0 - 14

'You can also declare an array with no size:
Dim DynamArray() as Integer

'Then change the length afterwards:
ReDim DynamArray(RowCount)

'And Finally, if you want to add an item to the array:
ReDim Preserve DynamArray(DynamArray.Length)
DynamArray(DynamArray.Length - 1) = Value

Since you understand how to do this enough to have done it in C++, I won't bore you with details... Here is another way to do it, look into using an arrayList, it dynamically holds multiple datatypes

Dim aList As New ArrayList
aList.Add(Object)
aList.Count
aList.Item(0)

Re: dynamic arrays in vb.net ?????

Mon, 16 Nov 2009 13:46:01 -0800

thank u for the info, really helped, im still new to vb.net so im kinda learning as i go, thanx again!