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dotnet compact framework : Deselecting a value in a combo box
listbox but setting selectedindex or selectedvalue does not. Next thing I'm going to try is setting selectedindex via SendMessage. Let's keep each other posted. -- Alex Feinman --- Visit http://www.opennetcf.org [quoted text, click to view] "Jon Skeet [C# MVP]" <skeet@pobox.com> wrote in message news:MPG.1bcf5643ae50e68598b614@msnews.microsoft.com... > I've got two combo boxes which are somewhat linked - the second one is > only valid if the first one has a certain value. > > When I change the first one to a different value, I want to deselect > whatever's in the second box, leaving it blank. It's definitely > possible, because the databinding does is when we first enter the form > - the value is DBNull, and it manages to clear the box. > > According to the docs, setting the SelectedIndex to -1 should do it - > but it doesn't. It just sets the index to 0 instead. However, bizarrely > enough, setting the SelectedIndex from the command window in the > debugger does exactly the right thing. > > Any suggestions as to what might be going on? > > -- > Jon Skeet - <skeet@pobox.com> > http://www.pobox.com/~skeet > If replying to the group, please do not mail me too
Thanks, Tim.
Peter Foot and I have both confirmed that the KB article is applicable and addresses exactly the issue we are seeing. The workaround works. As an alternative, sending CB_SETCURSEL (0x14e) also works although there is a potentially useful side effect of SelectionChanged not being fired -- Alex Feinman --- Visit http://www.opennetcf.org [quoted text, click to view] "Tim Wilson" <TIM(UNDERSCORE)WILSON(AT)ROGERS(PERIOD)COM> wrote in message news:%23$dKMrIrEHA.3876@TK2MSFTNGP15.phx.gbl... >I don't know if you've already seen this information, or if it even applies > in this case since it's related to the full framework, but I'll pass it > along anyways... > http://support.microsoft.com/default.aspx?scid=kb;en-us;327244 > > -- > Tim Wilson > .Net Compact Framework MVP > > "Jon Skeet [C# MVP]" <skeet@pobox.com> wrote in message > news:MPG.1bcf5643ae50e68598b614@msnews.microsoft.com... >> I've got two combo boxes which are somewhat linked - the second one is >> only valid if the first one has a certain value. >> >> When I change the first one to a different value, I want to deselect >> whatever's in the second box, leaving it blank. It's definitely >> possible, because the databinding does is when we first enter the form >> - the value is DBNull, and it manages to clear the box. >> >> According to the docs, setting the SelectedIndex to -1 should do it - >> but it doesn't. It just sets the index to 0 instead. However, bizarrely >> enough, setting the SelectedIndex from the command window in the >> debugger does exactly the right thing. >> >> Any suggestions as to what might be going on? >> >> -- >> Jon Skeet - <skeet@pobox.com> >> http://www.pobox.com/~skeet >> If replying to the group, please do not mail me too > >
I don't know if you've already seen this information, or if it even applies
in this case since it's related to the full framework, but I'll pass it along anyways... http://support.microsoft.com/default.aspx?scid=kb;en-us;327244 -- Tim Wilson ..Net Compact Framework MVP [quoted text, click to view] "Jon Skeet [C# MVP]" <skeet@pobox.com> wrote in message news:MPG.1bcf5643ae50e68598b614@msnews.microsoft.com... > I've got two combo boxes which are somewhat linked - the second one is > only valid if the first one has a certain value. > > When I change the first one to a different value, I want to deselect > whatever's in the second box, leaving it blank. It's definitely > possible, because the databinding does is when we first enter the form > - the value is DBNull, and it manages to clear the box. > > According to the docs, setting the SelectedIndex to -1 should do it - > but it doesn't. It just sets the index to 0 instead. However, bizarrely > enough, setting the SelectedIndex from the command window in the > debugger does exactly the right thing. > > Any suggestions as to what might be going on? > > -- > Jon Skeet - <skeet@pobox.com> > http://www.pobox.com/~skeet > If replying to the group, please do not mail me too
Cool. Nice job!
-- Tim Wilson ..Net Compact Framework MVP [quoted text, click to view] "Peter Foot [MVP]" <feedback@no-spam.inthehand.com> wrote in message news:uAaJY3IrEHA.3324@TK2MSFTNGP15.phx.gbl... > Thats just the ticket! Setting it twice works. > > I put together a number of ComboBox "bug-fixes" into a ComboBoxEx class - > posted the code to my blog here:- > http://blog.opennetcf.org/pfoot/PermaLink.aspx?guid=dd0fe46e-dd82-428c-9982-323ef182f25c > > Peter > > -- > Peter Foot > Windows Embedded MVP > www.inthehand.com | www.opennetcf.org > > Do have an opinion on the effectiveness of Microsoft Windows Mobile and > Embedded newsgroups? Let us know! > https://www.windowsembeddedeval.com/community/newsgroups > > "Tim Wilson" <TIM(UNDERSCORE)WILSON(AT)ROGERS(PERIOD)COM> wrote in message > news:%23$dKMrIrEHA.3876@TK2MSFTNGP15.phx.gbl... > >I don't know if you've already seen this information, or if it even applies > > in this case since it's related to the full framework, but I'll pass it > > along anyways... > > http://support.microsoft.com/default.aspx?scid=kb;en-us;327244 > > > > -- > > Tim Wilson > > .Net Compact Framework MVP > > > > "Jon Skeet [C# MVP]" <skeet@pobox.com> wrote in message > > news:MPG.1bcf5643ae50e68598b614@msnews.microsoft.com... > >> I've got two combo boxes which are somewhat linked - the second one is > >> only valid if the first one has a certain value. > >> > >> When I change the first one to a different value, I want to deselect > >> whatever's in the second box, leaving it blank. It's definitely > >> possible, because the databinding does is when we first enter the form > >> - the value is DBNull, and it manages to clear the box. > >> > >> According to the docs, setting the SelectedIndex to -1 should do it - > >> but it doesn't. It just sets the index to 0 instead. However, bizarrely > >> enough, setting the SelectedIndex from the command window in the > >> debugger does exactly the right thing. > >> > >> Any suggestions as to what might be going on? > >> > >> -- > >> Jon Skeet - <skeet@pobox.com> > >> http://www.pobox.com/~skeet > >> If replying to the group, please do not mail me too > > > > > >
I've got two combo boxes which are somewhat linked - the second one is
only valid if the first one has a certain value. When I change the first one to a different value, I want to deselect whatever's in the second box, leaving it blank. It's definitely possible, because the databinding does is when we first enter the form - the value is DBNull, and it manages to clear the box. According to the docs, setting the SelectedIndex to -1 should do it - but it doesn't. It just sets the index to 0 instead. However, bizarrely enough, setting the SelectedIndex from the command window in the debugger does exactly the right thing. Any suggestions as to what might be going on? -- Jon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet
Thats just the ticket! Setting it twice works.
I put together a number of ComboBox "bug-fixes" into a ComboBoxEx class - posted the code to my blog here:- http://blog.opennetcf.org/pfoot/PermaLink.aspx?guid=dd0fe46e-dd82-428c-9982-323ef182f25c Peter -- Peter Foot Windows Embedded MVP www.inthehand.com | www.opennetcf.org Do have an opinion on the effectiveness of Microsoft Windows Mobile and Embedded newsgroups? Let us know! https://www.windowsembeddedeval.com/community/newsgroups [quoted text, click to view] "Tim Wilson" <TIM(UNDERSCORE)WILSON(AT)ROGERS(PERIOD)COM> wrote in message news:%23$dKMrIrEHA.3876@TK2MSFTNGP15.phx.gbl... >I don't know if you've already seen this information, or if it even applies > in this case since it's related to the full framework, but I'll pass it > along anyways... > http://support.microsoft.com/default.aspx?scid=kb;en-us;327244 > > -- > Tim Wilson > .Net Compact Framework MVP > > "Jon Skeet [C# MVP]" <skeet@pobox.com> wrote in message > news:MPG.1bcf5643ae50e68598b614@msnews.microsoft.com... >> I've got two combo boxes which are somewhat linked - the second one is >> only valid if the first one has a certain value. >> >> When I change the first one to a different value, I want to deselect >> whatever's in the second box, leaving it blank. It's definitely >> possible, because the databinding does is when we first enter the form >> - the value is DBNull, and it manages to clear the box. >> >> According to the docs, setting the SelectedIndex to -1 should do it - >> but it doesn't. It just sets the index to 0 instead. However, bizarrely >> enough, setting the SelectedIndex from the command window in the >> debugger does exactly the right thing. >> >> Any suggestions as to what might be going on? >> >> -- >> Jon Skeet - <skeet@pobox.com> >> http://www.pobox.com/~skeet >> If replying to the group, please do not mail me too > >
[quoted text, click to view]
<"Tim Wilson" <TIM(UNDERSCORE)WILSON(AT)ROGERS(PERIOD)COM>> wrote: > I don't know if you've already seen this information, or if it even applies > in this case since it's related to the full framework, but I'll pass it > along anyways... > http://support.microsoft.com/default.aspx?scid=kb;en-us;327244 Oh good grief... thanks very much. Oddly enough, that's something I wouldn't have thought of doing :) -- Jon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet
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