Public Class EnumerableClass : Implements IEnumerable Private strings( ) As String Private ctr As Integer = 0
Private Class MyEnumerator
Implements IEnumerator Private currentListBox As EnumerableClass Private index As Integer
Public Sub New(ByVal currentListBox As EnumerableClass)
Me.currentListBox = currentListBox
index = -1 End Sub
Public Function MoveNext( ) As Boolean _
Implements IEnumerator.MoveNext
index += 1 If index >= currentListBox.strings.Length Then
Return False
Else
Return True End If End Function
Public Sub Reset( ) _
Implements IEnumerator.Reset
index = -1 End Sub
Public ReadOnly Property Current( ) As Object _
Implements IEnumerator.Current
Get
Return currentListBox(index) End Get End Property End Class ' end nested class
Public Function GetEnumerator( ) As IEnumerator _
Implements IEnumerable.GetEnumerator
Return New MyEnumerator(Me) End Function
Public Sub New( _
ByVal ParamArray initialStrings( ) As String)
ReDim strings(7)
Dim s As String
For Each s In initialStrings
strings(ctr) = s
ctr += 1
Next End Sub
Public Sub Add(ByVal theString As String)
strings(ctr) = theString
ctr += 1 End Sub
Default Public Property Item( _
ByVal index As Integer) As String
Get If index < 0 Or index >= strings.Length Then
' handle bad index
Exit Property End If
Return strings(index) End Get
Set(ByVal Value As String)
strings(index) = Value End Set End Property
Public Function GetNumEntries( ) As Integer
Return ctr End Function
