Newbie Structure question

[xceph]

Hi, Im new to VB.net and am running into a small problem.

I've created the following structure

Public Structure convertedCodes
    Dim code As String
    Dim field As List(Of String)
End Structure

and I try to create an instance as follows:

                Dim temp As New convertedCodes
                temp.code = oldc.code
                temp.field.Add(oldc.field)

and it crashes horribly!

I get "Object reference not set to an instance of an object.", so I am assuming there is a real problem with creating lists in a structure, and anyone who could offer assistance, or a better approach would make my day.

Cheers!
-Andrew

 

[MattP]

I'm assuming oldc.field is a List(Of String)

temp.field = oldc.field

 

[JuggaloBrotha]

Hi, Im new to VB.net and am running into a small problem.

I've created the following structure

Public Structure convertedCodes
Dim code As String
Dim field As List(Of String)
End Structure

and I try to create an instance as follows:

Dim temp As New convertedCodes
temp.code = oldc.code
temp.field.Add(oldc.field)

and it crashes horribly!

I get "Object reference not set to an instance of an object.", so I am assuming there is a real problem with creating lists in a structure, and anyone who could offer assistance, or a better approach would make my day.

Cheers!
-Andrew

Your List(Of String) isn't set to an instance of an object, once you set it to one, problem go away

For a case like this, I would use a class instead of a structure, but that's just me

 

[Tom]

I agree with JuggaloBrotha, putting it into a class would be better. As an additional option, you could input it into a typed dataset with two linked tables.

 

[JuggaloBrotha]

you could input it into a typed dataset with two linked tables.

Yikes, I would create a class to handle the two tables in the dataset if it were done this way. Which means either way, creating a class would be involved.