Question

Using VB 2008 Express.

Attaching code to buttons when they’re clicked is easy when they’re static buttons on the form; just double click the button on the form designer and add code to the event.

I have a series of buttons that are generated in a control array, so they’re generated in a class, and in the form there are no buttons until runtime.

So newbie question with a probably simple answer…how do I enter code for the click event for buttons that aren’t there until they’re instantiated as a class at runtime?

Answer 1

The way you would do it for regular buttons, I think.

What action do you want to take on each of the buttons? If the action is different for each of the button, could you give an example of what it looks like?

EDIT: Crude code ahead

   Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim button As Button()
        ReDim button(2)

        Dim button1 As New Button
        button1.Top = 0
        button1.Height = 100
        button1.Text = "hello"

        Dim button2 As New Button
        button2.Top = 200
        button2.Height = 100
        button2.Text = "world"

        button(0) = button1
        button(1) = button2

        For i As Integer = 0 To 1
            '** This is where all the buttons are tied, to a common handler
            AddHandler button(i).Click, AddressOf doSomething
        Next

        Me.Controls.AddRange(button)
    End Sub


    Protected Sub doSomething(ByVal sender As Object, ByVal e As EventArgs)
        Dim thisButton As Button
        thisButton = sender

        thisButton.BackColor = Color.DarkBlue
        thisButton.Text = "clicked"
    End Sub