Hello,
There are some items in ListView1, but error will occur in the code below,
why? Thank you.
************************************************** **************
Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal e
As System.EventArgs) Handles ListView1.SelectedIndexChanged
MessageBox.Show(ListView1.SelectedItems(0).Index)
End Sub 10 1985
YXG,
Do we ask to much when we ask in what situation and what is the error?
Cor
"yxq" <ga***@163.net> Hello, There are some items in ListView1, but error will occur in the code below, why? Thank you.
************************************************** ************** Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListView1.SelectedIndexChanged MessageBox.Show(ListView1.SelectedItems(0).Index) End Sub
Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal e
As System.EventArgs) Handles ListView1.SelectedIndexChanged
if ListView1.SelectedItems.count>0 then
MessageBox.Show(ListView1.SelectedItems(0).Index.T ostring)
endif
End Sub
What is the error?
--
Mike
Mike McIntyre
Visual Basic MVP www.getdotnetcode.com
"yxq" <ga***@163.net> wrote in message
news:ew**************@TK2MSFTNGP14.phx.gbl... Hello, There are some items in ListView1, but error will occur in the code below, why? Thank you.
************************************************** ************** Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListView1.SelectedIndexChanged MessageBox.Show(ListView1.SelectedItems(0).Index) End Sub
"Mike McIntyre" <mi****@dotnetshowandtell.com> wrote in message
news:e0**************@TK2MSFTNGP12.phx.gbl... What is the error?
-- Mike
Mike McIntyre Visual Basic MVP www.getdotnetcode.com
"yxq" <ga***@163.net> wrote in message news:ew**************@TK2MSFTNGP14.phx.gbl... Hello, There are some items in ListView1, but error will occur in the code
below, why? Thank you.
************************************************** ************** Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal
e As System.EventArgs) Handles ListView1.SelectedIndexChanged MessageBox.Show(ListView1.SelectedItems(0).Index) End Sub
Yes I've had that. At the instance of selecting, the event is fired with no
items selected. I got round it by putting in a catch at the top
If listview1.SelectedItems = 0 then Exit Sub
I don't know why it does it.
- Jerry
"Jerry Spence1" <je**********@somewhere.com> schrieb: Yes I've had that. At the instance of selecting, the event is fired with no items selected. I got round it by putting in a catch at the top
If listview1.SelectedItems = 0 then Exit Sub
.... should read 'ListView1.SelectedItems.Count > 0'...
--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>
"yxq" <ga***@163.net> schrieb: There are some items in ListView1, but error will occur in the code below, why? Thank you.
************************************************** ************** Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListView1.SelectedIndexChanged MessageBox.Show(ListView1.SelectedItems(0).Index) End Sub
That's not a bug. It's a feature.
When the user initiates a selection change that effectively results in all
selected items being deselected and then one or more items being
(re)selected, the control will raise the event twice, first for deselecting
the items and then for selecting them again (although the user will only see
that as a single operation). You can avoid the exception by extending your
code like this:
\\\
Dim SourceControl As ListView = DirectCast(sender, ListView)
If SourceControl.SelectedItems.Length > 0 Then
...
End If
///
--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>
Thank you very much!
"Herfried K. Wagner [MVP]" <hi***************@gmx.at> дÈëÏûÏ¢ÐÂÎÅ:ur**************@tk2msftngp13.phx.gbl ... "yxq" <ga***@163.net> schrieb: There are some items in ListView1, but error will occur in the code below, why? Thank you.
************************************************** ************** Private Sub ListView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListView1.SelectedIndexChanged MessageBox.Show(ListView1.SelectedItems(0).Index) End Sub
That's not a bug. It's a feature.
When the user initiates a selection change that effectively results in all selected items being deselected and then one or more items being (re)selected, the control will raise the event twice, first for deselecting the items and then for selecting them again (although the user will only see that as a single operation). You can avoid the exception by extending your code like this:
\\\ Dim SourceControl As ListView = DirectCast(sender, ListView) If SourceControl.SelectedItems.Length > 0 Then ... End If ///
-- Herfried K. Wagner [MVP] <URL:http://dotnet.mvps.org/> ... should read 'ListView1.SelectedItems.Count > 0'...
-- Herfried K. Wagner [MVP] <URL:http://dotnet.mvps.org/>
I think I was right the first time. If there are no selected items, then get
out. It happens when the event fires for the first time.
- Jerry
On 2004-12-11, Jerry Spence1 <je**********@somewhere.com> wrote: ... should read 'ListView1.SelectedItems.Count > 0'...
-- Herfried K. Wagner [MVP] <URL:http://dotnet.mvps.org/> I think I was right the first time. If there are no selected items, then get out. It happens when the event fires for the first time.
Of course, your original code snippet does have the minor disadvantage
of not compiling. That can be a detriment in certain applications.
:)
David,
"David" <df*****@woofix.local.dom> schrieb: ... should read 'ListView1.SelectedItems.Count > 0'...
I think I was right the first time. If there are no selected items, then get out. It happens when the event fires for the first time.
Of course, your original code snippet does have the minor disadvantage of not compiling. That can be a detriment in certain applications.
:)
:-)))
"It doesn’t matter how fast your code is
if it doesn’t work."
-- Joe Hacker in "Hardcore Visual Basic" (Bruce McKinney)
--
Herfried K. Wagner [MVP]
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