Instantiate Integer array in a stucture

hashtlishnii · June 18th, 2004, 10:28 AM

Hello all,
I'm working with VB.NET 2002, 1.0 Framework. Here's my problem: I'm trying to create a STRUCTURE with an array element. The STRUCTURE looks like this:

Private Structure StructOfLabs
Dim LabGroup As String
Dim Hours() As Integer
End Structure

My big problem comes when I try to put stuff into the array. I can get to the LabGroup ok, but the compiler doesn't like me trying to access Hours() until I instantiate it. It tells me:
"An unhandeled exception of type 'System.NullReferenceException' occured in UpdateCalendar.exe

Additional information: Object reference not set to an instance of an object."

myLabs(0).LabGroup = ""
myLabs(0).Hours(0) = 0

I've searched & searched and I get tantalizing hints of how to go about it, but nothing materalizes. I would sure appreciate a bit of help. Thanks, all. -RK

jaucourt · June 18th, 2004, 11:26 AM

I think your problem might be that you've not dimensioned the array - i.e. you need to either do

Code:

Private Structure StructOfLabs
    Dim LabGroup As String
    Dim Hours(0) As Integer
End Structure

OR, where you are using the array, first do

Code:

Redim StructOfLabs.Hours(0)

hashtlishnii · June 18th, 2004, 11:56 AM

VB won't let me do the first: "Arrays declared as structure members cannot be declared with an initial size." The second suggestion did work, though. I didn't even think of trying the Redim. Thanks! -RK