I thought it was an easy question

[Guest]

Hey all,

How do I add an element to an already populated array?
dim myary() as string

thanks,
rodchar

 

[Imran Koradia]

Dim myarray() As Integer = {1, 2}
ReDim Preserve myarray(2)
myarray(2) = 3

Don't forget the preserve word or else all the elements will be lost from
the array. Also, you would be better off using an ArrayList if you are going
to be adding elements frequently since Redim Preserve is expensive
performance-wise (especially with larger arrays).

hope that helps..
Imran.

 

[Iain Mcleod]

Hi rodchar

use "redim preserve".

Beware that this can be inefficient. If you are having to do it frequently,
use a System.collection type such as arraylist.
http://msdn.microsoft.com/library/d...frlrfSystemCollectionsArrayListClassTopic.asp

But back to redim:

The following example from microsoft.com:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vblr7/html/vastmReDim.asp

Dim I, MyArray() As Integer ' Declare variable and array variable.
ReDim MyArray(5) ' Allocate 6 elements.
For I = 0 To UBound(MyArray)
MyArray(I) = I ' Initialize array.
Next IThe next statement resizes the array without saving the contents of
the elements.

ReDim MyArray(10) ' Resize to 11 elements.
For I = 0 To UBound(MyArray)
MyArray(I) = I ' Initialize array.
Next IThe following statement resizes the array but saves the contents of
the elements.

ReDim Preserve MyArray(15) ' Resize to 16 elements.

 

[Iain Mcleod]

lol...

Dim myarray() As Integer = {1, 2}
ReDim Preserve myarray(2)
myarray(2) = 3

Don't forget the preserve word or else all the elements will be lost from
the array. Also, you would be better off using an ArrayList if you are
going
to be adding elements frequently since Redim Preserve is expensive
performance-wise (especially with larger arrays).

hope that helps..
Imran.

 

[Guest]

thanks.

Dim myarray() As Integer = {1, 2}
ReDim Preserve myarray(2)
myarray(2) = 3

Don't forget the preserve word or else all the elements will be lost from
the array. Also, you would be better off using an ArrayList if you are going
to be adding elements frequently since Redim Preserve is expensive
performance-wise (especially with larger arrays).

hope that helps..
Imran.

 

[Imran Koradia]

some timing huhn ;-)?

lol...

 

[Guest]

how do you clear an entire array. And if you clear an array would you still
have to redim it if you filling it up with more than it had prior to clear?

thanks,
rodchar

 

[Imran Koradia]

how do you clear an entire array. And if you clear an array would you still
have to redim it if you filling it up with more than it had prior to clear?

thanks,
rodchar

Two ways:
1. myArray.Clear
This clears the elements of the array leaving the array elements in place.
In this case, yes, you will have to ReDim if you want to add more elements
than are already in it.

2. Erase myArray
This will nullify the array object deleting all elements in it. You'll have
to define the array again to use it.

hope that helps..
Imran.