How do I create an event handler for a programmatically created PictureBox Array?

Question

I have created a two-dimensional array of PictureBoxes, and I want to add a DragDrop event to all the elements of the array.

 For x As Integer = 1 To 16
        For y As Integer = 1 To 4
            p(x, y) = New PictureBox()
            p(x, y).Image = My.Resources.Kästchen
            p(x, y).Location = New Point(pMain.Left + x * 48, pMain.Top + y * 48)
            p(x, y).Size = New Size(48, 48)
            p(x, y).Name =  "p"+str(x)+str(y)
            AddHandler p(x, y).DragDrop, AddressOf p(x,y)_DragDrop

            p(x, y).Visible = True
            Me.Controls.Add(p(x, y))

            
        Next
    Next

I know that there's a similar answer here, but I wasn't able to adapt it to arrays. How do I add the DragDrop Event for all the PictureBoxes, which are created during runtime?

Since the number of controls is hardcoded, why not put them on the form in the designer? You can still store a reference to them in an array for looping. Note that your app is likely leaking and array indices start at 0. Please read How to Ask and take the tour — Ňɏssa Pøngjǣrdenlarp
– Ňɏssa Pøngjǣrdenlarp, Commented Oct 12, 2017 at 15:29

Visual Vincent · Accepted Answer · 2017-10-12 20:39:20Z

1

You can't have a sub named p(x,y)_DragDrop. You need to create a sub with the signature (sender As Object, e As DragEventArgs), and use sender to identify the picturebox.

edited Oct 12, 2017 at 20:39

Visual Vincent

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answered Oct 12, 2017 at 14:25

Patrick

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3 Comments

Cyrill Over a year ago

So I have to create a Sub for each picture box?

Cyrill Over a year ago

I came up with this, but it shows the error: "." expected Private Sub p11(p11 As Object, e As System.Windows.Forms.DragEventArgs) Handles p(1,1).DragDrop End Sub

Visual Vincent Over a year ago

@Cyrill : No, just create one event handler for all picture boxes: Private Sub PictureBoxes_DragDrop(sender As Object, e As DragEventArgs) (notice that there's no Handles ... on the end), then: AddHandler p(x, y).DragDrop, AddressOf PictureBoxes_DragDrop.

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