Passing AddressOf a function to constructor

[David A. Osborn]

I need to pass the address of a function to the contructor of a class when I
create an instance of it so that in the new instance I can dynamically
hookup a handler by doing the following:

AddHandler ButtonNew.Click, AddressOf My_Passed_Function

I thought I could use a delegate but that doesn't seem to be working. Am I
on the right track?

 

[Jay B. Harlow [MVP - Outlook]]

David,
You need to define your parameter as the type of handler you are going to
use, when you call your function/constructor you use addressof, when you
call AddHandler you can use the parameter (as its already has the addressof
something.

Something like:

Public Class Widget

Public Sub New(ByVal theHandler As EventHandler)
Dim ButtonNew As New Button
AddHandler ButtonNew.Click, theHandler
End Sub

End Class

Public Sub Widget_Click(ByVal sender As Object, ByVal e As EventArgs)

End Sub

Dim aWidget As New Widget(AddressOf Widget_Click)

You can find out the type of handler (Delegate) needed by looking up the
event in the online help.

Hope this helps
Jay

 

[Cor Ligthert]

David,

Why not passing the control itself so. Something as

\\\
Private Sub Form1_Load(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
Button1.Text = "0"
Dim mb As New myButtonClass(Me.Button1)
End Sub
End Class
Friend Class myButtonClass
Friend Sub New(ByVal this As Control)
AddHandler this.Click, AddressOf ButtonClick
End Sub
Private Sub ButtonClick(ByVal sender As System.Object, _
ByVal e As System.EventArgs)
Dim mybutton As Button = DirectCast(sender, Button)
mybutton.Text = (CInt(mybutton.Text) + 1).ToString
End Sub
End Clas
///
I hope this gives some ideas

Cor