"Kyle Baley" <KyleBaley@discussions.microsoft.com> wrote in message
news:AE00D4D6-FCD6-459A-9A0C-6B3EC3499055@microsoft.com...
> I'm binding a ComboBox's SelectedValue property to a datasource and using
> a
> custom Format event. The problem is that the format event never fires.
> Here's
> some sample code that demonstrates this (create a form with a combobox on
> it):
>
> Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
>
> Dim t As DataTable = New DataTable
>
> t.Columns.Add(New DataColumn("ID",
> System.Type.GetType("System.Int32")))
> t.Columns.Add(New DataColumn("Name",
> System.Type.GetType("System.String")))
> t.Rows.Add(New Object() {1, "One"})
> t.Rows.Add(New Object() {2, "Two"})
> t.Rows.Add(New Object() {3, "Three"})
>
> ComboBox1.DataSource = t
> ComboBox1.DisplayMember = "Name"
> ComboBox1.ValueMember = "ID"
>
> getBinding()
>
> End Sub
>
> Public Sub getBinding()
> Dim t As DataTable = New DataTable
> t.Columns.Add("EntityID", System.Type.GetType("System.String"))
> t.Columns.Add("NumberID", System.Type.GetType("System.Int32"))
> t.Rows.Add(New Object() {"123", 2})
>
> Dim b As Binding = New Binding("SelectedValue", t, "NumberID")
> AddHandler b.Format, AddressOf Format_Event
> ComboBox1.DataBindings.Add(b)
>
> End Sub
>
> Private Sub Format_Event(ByVal sender As Object, ByVal e As
> ConvertEventArgs)
> MsgBox("Moo")
> End Sub
>
> As it standards, Format_Event will never run (although the combobox is
> properly bound and it's value is set to 2). Also note that if you change
> the
> binding so that it binds to the SelectedIndex property, the Format event
> fires as expected.
>
> So the question is, why doesn't the Format event fire when I add a binding
> to a ComboBox's SelectedValue property?
>
> Apologies if this has been answered already. I've found similar questions
> asked on various newsgroups but haven't seen any solutions.

"Tom Krueger [MSFT]" wrote:

>
> I'm looking into this. I did find that the SelectedValue Binding does fire
> when the control loses focus, but it does not fire when an item is selected.
> So that confirms your findings, I don't know if it will be possible or not.
>
> --
> Tom Krueger
>
> My Blog - http://weblogs.asp.net/tom_krueger
> Smart Client DevCenter - http://msdn.microsoft.com/smartclient/
> Mobile DevCenter - http://msdn.microsoft.com/mobility
>
> This posting is provided "as is" with no warranties and confers no rights.
>
> "Kyle Baley" <KyleBaley@discussions.microsoft.com> wrote in message
> news:AE00D4D6-FCD6-459A-9A0C-6B3EC3499055@microsoft.com...
> > I'm binding a ComboBox's SelectedValue property to a datasource and using
> > a
> > custom Format event. The problem is that the format event never fires.
> > Here's
> > some sample code that demonstrates this (create a form with a combobox on
> > it):
> >
> > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles MyBase.Load
> >
> > Dim t As DataTable = New DataTable
> >
> > t.Columns.Add(New DataColumn("ID",
> > System.Type.GetType("System.Int32")))
> > t.Columns.Add(New DataColumn("Name",
> > System.Type.GetType("System.String")))
> > t.Rows.Add(New Object() {1, "One"})
> > t.Rows.Add(New Object() {2, "Two"})
> > t.Rows.Add(New Object() {3, "Three"})
> >
> > ComboBox1.DataSource = t
> > ComboBox1.DisplayMember = "Name"
> > ComboBox1.ValueMember = "ID"
> >
> > getBinding()
> >
> > End Sub
> >
> > Public Sub getBinding()
> > Dim t As DataTable = New DataTable
> > t.Columns.Add("EntityID", System.Type.GetType("System.String"))
> > t.Columns.Add("NumberID", System.Type.GetType("System.Int32"))
> > t.Rows.Add(New Object() {"123", 2})
> >
> > Dim b As Binding = New Binding("SelectedValue", t, "NumberID")
> > AddHandler b.Format, AddressOf Format_Event
> > ComboBox1.DataBindings.Add(b)
> >
> > End Sub
> >
> > Private Sub Format_Event(ByVal sender As Object, ByVal e As
> > ConvertEventArgs)
> > MsgBox("Moo")
> > End Sub
> >
> > As it standards, Format_Event will never run (although the combobox is
> > properly bound and it's value is set to 2). Also note that if you change
> > the
> > binding so that it binds to the SelectedIndex property, the Format event
> > fires as expected.
> >
> > So the question is, why doesn't the Format event fire when I add a binding
> > to a ComboBox's SelectedValue property?
> >
> > Apologies if this has been answered already. I've found similar questions
> > asked on various newsgroups but haven't seen any solutions.
>
>