VB.Net Declare an array of classes, and set value

Question

I have a little syntax declare problem in VB.Net.

Dim proxy As USImportoerServiceTypeClient = DMRUtils.CreateAndConfigureClient()

Dim request As New USDeclare_I()
request.DeclareCollection = New US_ITypeDeclare() {}
For Each KES In request.DeclareCollection
    KES.DeclareCollectionStructure.DeclareCollectionValidDate = DateTime.ParseExact(txtDeclareDate.Text, "dd-MM-yyyy", System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat)
Next

This above code do not work, becase the "US_ITypeDeclare() {}" is empty an only contains a new DeclareCollectionStructure

How do I declare a KoeretoejErklaeringStructure to this an set this date value til "DeclareCollectionStructure.DeclareCollectionValidDate" ?

Best regards from Denmark

You are trying to For Each over the array, but the array is empty. Where are the objects suppose to be coming from? — LarsTech
– LarsTech, Commented Jun 7, 2012 at 14:10
Aside from very specific uses to their advantage, arrays are a rather clumsy and antiquated way of storing and managing information in .NET. Perhaps lists or collections would better suit this application. — J...
– J..., Commented Jun 7, 2012 at 14:20

Olivier Jacot-Descombes · Accepted Answer · 2012-06-07 14:33:44Z

2

Arrays have a fixed length, which is declared when the array is created. Therefore your array will always have a length of 0.

Use a List(Of T) instead. Lists grow dynamically when you add items to them.

request.DeclareCollection = New List(Of US_ITypeDeclare)
Dim newItem = new US_ITypeDeclare()
newItem.DeclareCollectionStructure.DeclareCollectionValidDate =  _
    DateTime.ParseExact(txtDeclareDate.Text, "dd-MM-yyyy", _
                System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat)
request.DeclareCollection.Add(newItem)
' Now the list contains one item

Of cause you will have to adapt the definition of DeclareCollection to be a list instead of an array.

answered Jun 7, 2012 at 14:33

Olivier Jacot-Descombes

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3 Comments

JanBorup Over a year ago

Thank you very much, Oliver. I think we are close to a solution, but there is a litlle issue in the first line. request.DeclareCollection = New List(of US_ITypeDeclare) is not walid an in the error tooltip is says: "Cannot be converted to a 1-dimentional array of US_ITypeDeclare", maybe becase the US_ITypeDeclare is an multi-array of classes, as defined above.

JanBorup Over a year ago

PLEASE HELP ... If posible. :-)

Olivier Jacot-Descombes Over a year ago

As I said, you will have to change DeclareCollection to be a list. Public DeclareCollection As List(Of US_ITypeDeclare). Another option is to keep the array but initialize it with a constant length of one (it's hard to say from here) Dim newItem = new US_ITypeDeclare(1)

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