How access fields of objects stored in Array List

rfinks · July 11th, 2006, 05:48 AM

I've got a fairly simple object / class and have stored several of them in an ArrayList. My question is how do I access the individual fields in the object within the ArrayList.

Class definition:

Public Class Pages
    Public PageNumber As Integer
    Public StartKey As Integer
    Public EndKey As Integer

    Public Sub New(ByVal PageNumber As Integer, ByVal StartKey As Integer, ByVal EndKey As Integer)
        MyBase.New()
        Me.PageNumber = PageNumber
        Me.StartKey = Startkey
        Me.EndKey = EndKey
    End Sub
End Class

Storing objects in ArrayList:

    Dim colArrayList As ArrayList

    colArrayList = New ArrayList

    colArrayList.Add(New Pages(intPageNum, intStartingKey, intEndingKey))

My question is how do I access intStartingKey and intEndingKey.

Thank you
Roger Finks

BrianWren · July 11th, 2006, 11:13 AM

To use early binding (so that intellisense will work), use an additional object:

Code:

    Dim colArrayList As ArrayList
    Dim tmpObj As Pages

    colArrayList = New ArrayList

    colArrayList.Add(New Pages(intPageNum, intStartingKey, intEndingKey))

    ' Here is where you gain access:
    tmpObj = colArrayList(<select the item youâre after here>)   ' Now the item in the Array 
                                                                  ' list and tmpObj reference
                                                                  ' the same object.

But this is not necessary to gain access to the individual objectsâs members. VB will access them just fine (though with late binding) with the following:

Code:

    Dim colArrayList As ArrayList

Code:

    colArrayList = New ArrayList

    colArrayList.Add(New Pages(intPageNum, intStartingKey, intEndingKey))

    colArrayList(<select the item youâre after here>).intStartKey = 25

rfinks · July 11th, 2006, 06:00 PM

Brian, your response works perfectly. I was trying to make it harder than it had to be.

Thanks
Roger