I am trying to programmatically add an unspecified amount of new UserControls to a form. One will be added every time an entry is selected in a ComboBox contained within the UserControl.
Problem is, the SelectedIndexChanged event fires completely erratically. Sometimes twice, sometimes 3 times, etc., but never just once. No matter how many times I set the combobox's SelectedIndex to -1, it fires at least once with a SelectedIndex of 0. Sometimes the Itemselected event fires multiple times inbetween SelectedIndexChanged events.
InvoiceEntry.vb snippet:
Public Event ItemSelected As EventHandler
Private Sub cboItem_SelectedIndexChanged(sender As System.Object, _
e As System.EventArgs) Handles cboItem.SelectedIndexChanged
RaiseEvent ItemSelected(Me, EventArgs.Empty)
End Sub
Invoice.vb snippet:
Private numEntries As Integer = 1
Public Sub invEntry1_ItemSelected() Handles invEntry1.ItemSelected
numEntries += 1
Dim newEntry As InvoiceEntry = invEntry1
Dim pt As Point = newEntry.Location
pt.Y += 30
newEntry.Location = pt
newEntry.Name = "invEntry" + numEntries.ToString
pnlEntries.Controls.Add(newEntry)
End Sub
I'm at a complete loss as to what is wrong. Please let me know if you need more information, as I will be monitoring this thread until I or someone else figures it out.
As far as I know, when you add new combo box the selected index is changing at this time (this is when it triggers first time). It will also trigger every time you programatically change a value.
If you want to generate controls after user has selected something from the combo box try using
ComboBox.SelectionChangeCommitted
http://msdn.microsoft.com/en-us/library/system.windows.forms.combobox.selectionchangecommitted.aspx