asked on

Argument 'Index' is not a valid value

Anybody know why i'm getting this error...
"Argument 'Index' is not a valid value"

There is a string value that its passing to it, I check that...

Private Function getSessionProduct(ByVal paramSessionCol As Collection, ByVal paramProductCol As Collection) As Collection
Dim colSessionProduct As Collection
Dim intCtr As Int32
Dim itSize As Int32 = paramSessionCol.Count
Dim objSessionElement As element
Dim objElement As element

For intCtr = 1 To itSize
colSessionProduct = paramSessionCol.Item(intCtr)
objSessionElement = colSessionProduct.Item(1)
objElement = paramProductCol.Item(objSessionElement.ProductCode) <----THIS IS WHERE THE ERROR IS HAPPENING
If Not objElement Is Nothing Then
getSessionProduct = colSessionProduct
Exit For
End If
Next
getSessionProduct = Nothing
End Function
Private Sub

brdrok

objSessionElement.ProductCode returns an integer?

tusharashah

Change your For loop like following:

For intCtr = 0 To itSize - 1

-tushar

ispcorp

ASKER

objSessionElemeent.ProductCode returns a string

Tusharashah...
An index of a collection can never have an index of 0, it blows up if I pass intCtr=0 into it.

brdrok

hmmm...could you please post the code for the Item() method. This might provide more clues as to what is genrating this error. My first gut reaction is that it's expecting a type integer but it's being a fred a type of string.

paramProductCol.Item(objSessionElement.ProductCode)

b1xml2

use Items, that the default Property Name
=======
objElement = paramProductCol.Items(objSessionElement.ProductCode),
you could also do this:

objElement = paramProductCol(objSessionElement.ProductCode)

ispcorp

ASKER

Item is a function within the Collection object. There is not method for it.

b1xml2...I don't see the difference, but I'll try it.

Rejojohny

>>objElement = paramProductCol.Item(objSessionElement.ProductCode)

u will get this error when objSessionElement.ProductCode returns an invalid key i.e. no item found in the collection for the key

Rejojohny

ok .. i tried this out to validate what i had mentioned above

in page load
Dim x As New Collection
x.Add("s", "1")
x.Add("s1", "2")

Response.Write(x.Item("2"))

Prints "s1"

Now changed the code to search for a collection item with an invalid key
Dim x As New Collection
x.Add("s", "1")
x.Add("s1", "2")

Response.Write(x.Item("3"))

got the error
Argument 'Index' is not a valid value.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Argument 'Index' is not a valid value.

ispcorp

ASKER

I know, isn't there anything that would cause this error not to happen if an item is not found. I know in a HashMap you can check to see if it exists. I finally got a work around where I do a Try Catch, in the case where it can't find it, it just continues with the variable being NOTHING. There has got to be a better way, though...

ASKER CERTIFIED SOLUTION

Rejojohny

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

ispcorp

ASKER

Ok, Rejojohny....Your right...I thought there might be another way, with out kicking off an error...Thanks