[Help] VB6 to VB.NET

[jhai_salvador]

Anyone here knows how to add controls at runtime then handle its event? -> its easy to do this with vb6 but im not sure how to do it in vb.net since it does not support control arrays.

[Joacim Andersson]

Here's an example that adds a button to the form.

  Private Sub AddButton()
    Dim btn As New Button()
    btn.Text = "New Button"
    btn.Location = New Point(10, 10) 'equal to .Top and .Left in VB6
    'Add the event handler
    AddHandler btn.Click, AddressOf MyButtonClick
    'Add the button to the form
    Me.Controls.Add(btn)
  End Sub

  Private Sub MyButtonClick(sender As Object, e As EventArgs)
    MessageBox.Show("Click")
  End Sub

[ident]

Check out the code bank submission by John Control Arrays in VB.NET

[jhai_salvador]

thanks, i got it answered before reading your comments. thanks anyway

Im still starting out with .NET and im more use to vb6 since its way easy for me to things like this.

Anyway, my solution for my problem is "something" like this.

'Global
Dim cWebDownloader() As cDownloader -> custom control based of WebClient

'Somewhere in button click event
For i as integer = 1 to 5
ReDim cWebDownloader(i)
cWebDownloader(i) = New cDownloader
AddHandler cWebDownloader(i).DownloadComplete, AddressOf cWebDownloader_DownloadComplete
next

'Then this is the sub where the event will get consumed
Private Sub cWebDownloader_DownloadComplete(Sender As System.Object, Filename As String)
'i used sender to determine the object that calls it
End Sub

Thanks,

[Shaggy Hiker]

Take a look at the List(of T). Generics were added with 2005 and have some HUGE advantages. Once you see what that can do you'll use arrays a lot less. Of course, a List makes use of an array behind the scenes, too, but it gives you Add, Insert, AddRange, Remove, RemoveAt, and many other methods that get rid of the need for Redim and Redim Preserve (and isn't that what you wanted anyways, since Redim will erase the array each time). The List resizes the underlying array as needed, but it does it much more efficiently than you will do with Redim. There are also a bunch of other generics beyond the List.

[jhai_salvador]

Take a look at the List(of T). Generics were added with 2005 and have some HUGE advantages. Once you see what that can do you'll use arrays a lot less. Of course, a List makes use of an array behind the scenes, too, but it gives you Add, Insert, AddRange, Remove, RemoveAt, and many other methods that get rid of the need for Redim and Redim Preserve (and isn't that what you wanted anyways, since Redim will erase the array each time). The List resizes the underlying array as needed, but it does it much more efficiently than you will do with Redim. There are also a bunch of other generics beyond the List.

Yes, you are right, but actually, releasing object after i use it is also what im after. so after DownloadComplete, object will get release, then will rely on array length to be used in for loop to create another set of object.

Will see list of T and see how i can use it on my code. Thanks,

[Shaggy Hiker]

Why create and destroy? Why not reuse?

[jhai_salvador]

Why create and destroy? Why not reuse?

Not sure.. haha.. its the first thing that came to my mind when i coded it.