WithEvents LinkedList is it Impossible?
- by serhio
What is the optimal approach to a WithEvents Collection - VB.NET?
Have you any remarks on the code bellow (skipping the Nothing verifications)?
The problem is when I obtain the LinkedListNode(Of Foo) in a For Each block I can set
myNode.Value = something, and here is a handlers leak...
-Could I override the FooCollection's GetEnumerator in this case?
-No. :( cause NotInheritable Class LinkedListNode(Of T)
Class Foo
Public Event SelectedChanged As EventHandler
End Class
Class FooCollection
Inherits LinkedList(Of Foo)
Public Event SelectedChanged As EventHandler
Protected Overloads Sub AddFirst(ByVal item As Foo)
AddHandler item.SelectedChanged, AddressOf OnSelectedChanged
MyBase.AddFirst(item)
End Sub
Protected Overloads Sub AddLast(ByVal item As Foo)
AddHandler item.SelectedChanged, AddressOf OnSelectedChanged
MyBase.AddLast(item)
End Sub
' ------------------- '
Protected Overloads Sub RemoveFirst()
RemoveHandler MyBase.First.Value.SelectedChanged, _
AddressOf OnSelectedChanged
MyBase.RemoveFirst()
End Sub
Protected Overloads Sub RemoveLast(ByVal item As Foo)
RemoveHandler MyBase.Last.Value.SelectedChanged, _
AddressOf OnSelectedChanged
MyBase.RemoveLast()
End Sub
' ------------------- '
Protected Sub OnSelectedChanged(ByVal sender As Object, ByVal e As EventArgs)
RaiseEvent SelectedChanged(sender, e)
End Sub
End Class
