Re: vb.net ListBox Help
- From: Jamal Mazrui <empower@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Sat, 1 Dec 2007 19:13:20 -0500 (EST)
Hi Rick, Indeed, that is puzzling. Perhaps try an event on the
BindingSource object instead -- I think it may be called
PositionChangedEvent. Are you using a single or multiple selection
listbox? If multiple, there is a SelectedIndex collection rather than a
single SelectedIndex, which might always return 0. In that case, I do not
know how to return the item with focus, so think the Position property of
BindingSource may work best.
You may also be able to bind the TextBox directly to the same binding
source, thus eliminating the need for resetting the TextBox via a ListBox
event.
Jamal
On Fri, 30 Nov 2007, Richard Thomas wrote:
> Date: Fri, 30 Nov 2007 14:43:15 -0500
> From: Richard Thomas <rthomas@xxxxxxxxxxx>
> Reply-To: programmingblind@xxxxxxxxxxxxx
> To: programmingblind@xxxxxxxxxxxxx
> Subject: Re: vb.net ListBox Help
>
> Hi Jamal:
>
> Tried the below with the same results.
>
> Note that the e-mailer is making things wrap in the wrong places, everything
> is ok in that respect.
>
> Mabey I can't iterate the ListBox using the ListBox controls at all after
> binding it to something?
>
> I wonder if only the nav for the DataTable or DataView is what works.for
> bound controls.
>
> Here is the latest code:
>
> Public Class frmStocksReport
>
> dim Dt As StockFDataSet.StocksDataTable
>
> Private Sub lbStocksReportNdx_SelectedIndexChanged( ByVal sender As
> System.Object, ByVal e As System.EventArgs) _
>
> Handles lbStocksReportNdx.SelectedIndexChanged
>
> MessageBox.Show( "Index is " & lbStocksReportNdx.SelectedIndex.ToString())
>
> Note: The above still returns 0 for all ListBox entries
>
> MessageBox.Show( _
>
> DirectCast( _
>
> lbStocksReportNdx.SelectedItem, DataRowView)("Ticker").ToString())
>
> The Above still returns the ticker for the first entry in the ListBox.
>
> By the way, I just dropped the ListBox on the form in the VS IDE and the
> events seem to be there as I am using them.
>
>
>
> End Sub
>
> Private Sub frmStocksReport_Load( ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
>
> Dt = New StockFDataSet.StocksDataTable()
>
> Dim StocksAdapter As New StockFDataSetTableAdapters.StocksTableAdapter()
>
> Dt = StocksAdapter.GetAllRows()
>
> lbStocksReportNdx.DisplayMember = "Name"
>
> lbStocksReportNdx.ValueMember = "Ticker"
>
> lbStocksReportNdx.DataSource = Dt
>
> End Sub
>
> End Class
>
>
> ----- Original Message -----
> From: "Jamal Mazrui" <empower@xxxxxxxxx>
> To: <programmingblind@xxxxxxxxxxxxx>
> Sent: Saturday, December 01, 2007 12:48 PM
> Subject: Re: vb.net ListBox Help
>
>
> > Data binding should be able to do what you want. In examining the code,
> > it appears that a right parenthesis should be moved after ToString()
> > rather than before it. Also, should it read SelectedIndex.ToString()
> > rather than SelectedItem.ToString()? When declaring the ListBox, did
> > you use the WithEvents keyword?
> >
> > Jamal
> > On Fri, 30 Nov 2007, Richard Thomas wrote:
> >
> >> Date: Fri, 30 Nov 2007 08:09:29 -0500
> >> From: Richard Thomas <rthomas@xxxxxxxxxxx>
> >> Reply-To: programmingblind@xxxxxxxxxxxxx
> >> To: programmingblind@xxxxxxxxxxxxx
> >> Subject: vb.net ListBox Help
> >>
> >> Hi Guys:
> >> I bind a ListBox to a DataTable in a Load Event and load it. This works
> >> fine. I can arrow up and down and the entries are correct.
> >> I can not read the entries in the ListBox into a TextBox.
> >> Even though I arrow up and down the list and the IndexChanged event fires
> >> the TextBox always shows the first entry in the list.
> >> Public Class frmStocksReport
> >> dim Dt As StockFDataSet.StocksDataTable
> >> Private Sub lbStocksReportNdx_SelectedIndexChanged( ByVal sender As
> >> System.Object, ByVal e As System.EventArgs) _
> >> Handles lbStocksReportNdx.SelectedIndexChanged
> >> MessageBox.Show( "item is " & lbStocksReportNdx.SelectedItem).ToString()
> >> Note: the above always shows the index as 0.' tbDescription.Text = _
> >> MessageBox.Show( _
> >> DirectCast( _
> >> lbStocksReportNdx.SelectedItem, DataRowView)("Ticker").ToString())
> >> Note: The above always shows the first item's Ticker Symbol.
> >> End Sub
> >> Do I somehow need to synch the underlying DataView or DataTable to the
> >> ListBox Selected Item somehow?
> >> Should I scrap the whole DataBinding senario?
> >> Any Ideas?
> >> Rick Farmington Mich. USA
> >>
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