vb.net to c# eventhandler conversion help

[c#2006user]

Hi everyone, i have a vb.net program ive converted most of the code but
i know events dont translate well, the original vb.net code uses
withevents and .handles and i can't get the events in c# to work 100%

they seem to hook up ok but when the eventhandler is called from the
method its null and fails.
or maybe im reading it wrong?

anyway its quite a bit of code so i wont post but if any would help i
am willing to pay if thats ok on these boards?

regards
bryan

[Jon Skeet [C# MVP]]

c#2006user <ht*******@hotm ail.com> wrote:

Hi everyone, i have a vb.net program ive converted most of the code but
i know events dont translate well, the original vb.net code uses
withevents and .handles and i can't get the events in c# to work 100%

they seem to hook up ok but when the eventhandler is called from the
method its null and fails.
That means they're *not* hooking up ok. In my experience, most
applications only need to hook up events when you create forms to start
with.
or maybe im reading it wrong?

anyway its quite a bit of code so i wont post but if any would help i
am willing to pay if thats ok on these boards?

Don't post your whole code, but reduce it down to a minimal program
that still shows the problem. If you still don't understand why it
doesn't work, post *that* code.

See http://www.pobox.com/~skeet/csharp/complete.html for more details.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[c#2006user]

thanks jon,

ill try.

protected ListControl mainList;
this.mainList.L eaveControl += new
dmControls.List Control.LeaveCo ntrolEventHandl er(mainList_Lea veControl);
this.mainList.S elected += new
dmControls.List Control.Selecte dEventHandler(m ainList_Selecte d);
this.mainList.S electionChanged += new
dmControls.List Control.Selecti onChangedEventH andler(mainList _SelectionChang ed);

protected delegate void
MainListLeaveCo ntrolEventHandl er(dmControls.D irection direction);
private MainListLeaveCo ntrolEventHandl er MainListLeaveCo ntrolEvent;
protected event MainListLeaveCo ntrolEventHandl er MainListLeaveCo ntrol
{
add { MainListLeaveCo ntrolEvent =
(MainListLeaveC ontrolEventHand ler)System.Dele gate.Combine(Ma inListLeaveCont rolEvent,
value); }
remove { MainListLeaveCo ntrolEvent =
(MainListLeaveC ontrolEventHand ler)System.Dele gate.Remove(Mai nListLeaveContr olEvent,
value); }
}

protected delegate void MainListSelecte dEventHandler(s tring sSelected,
object Data);
protected MainListSelecte dEventHandler MainListSelecte dEvent;
protected event MainListSelecte dEventHandler MainListSelecte d
{
add { MainListSelecte dEvent =
(MainListSelect edEventHandler) System.Delegate .Combine(MainLi stSelectedEvent ,
value); }
remove { MainListSelecte dEvent =
(MainListSelect edEventHandler) System.Delegate .Remove(MainLis tSelectedEvent,
value); }
}

protected delegate void MainListSelecti onChangedEventH andler(string
sSelected, object Item);
private MainListSelecti onChangedEventH andler
MainListSelecti onChangedEvent;
protected event MainListSelecti onChangedEventH andler
MainListSelecti onChanged
{
add { MainListSelecti onChangedEvent =
(MainListSelect ionChangedEvent Handler)System. Delegate.Combin e(MainListSelec tionChangedEven t,
value); }
remove { MainListSelecti onChangedEvent =
(MainListSelect ionChangedEvent Handler)System. Delegate.Remove (MainListSelect ionChangedEvent ,
value); }
}
private void mainList_LeaveC ontrol(Directio n direction)
{
............... ...........
}

private void mainList_Select ed(string sSelected, object Data)
{
if (MainListSelect edEvent != null)
MainListSelecte dEvent(sSelecte d, Data);
}

[c#2006user]

MainListSelecte dEvent is null when i try and call it from
mainList_Select ed.

[c#2006user]

thanks jon,

ill try.

public abstract class Page : IDisposable
{
protected ListControl mainList;

public virtual void DisplayPage(ref frmMain myForm)
{
this.mainList.L eaveControl += new
dmControls.List Control.LeaveCo ntrolEventHandl er(mainList_Lea veControl);

this.mainList.S elected += new
dmControls.List Control.Selecte dEventHandler(m ainList_Selecte d);
this.mainList.S electionChanged += new
dmControls.List Control.Selecti onChangedEventH andler(mainList _SelectionChang *ed);

}

protected delegate void
MainListLeaveCo ntrolEventHandl er(dmControls.D irection direction);
private MainListLeaveCo ntrolEventHandl er MainListLeaveCo ntrolEvent;
protected event MainListLeaveCo ntrolEventHandl er MainListLeaveCo ntrol
{
add { MainListLeaveCo ntrolEvent =
(MainListLeaveC ontrolEventHand ler)System.Dele gate.Combine(Ma inListLeaveCont *rolEvent,

value); }
remove { MainListLeaveCo ntrolEvent =
(MainListLeaveC ontrolEventHand ler)System.Dele gate.Remove(Mai nListLeaveContr *olEvent,

value); }

}
protected delegate void MainListSelecte dEventHandler(s tring sSelected,
object Data);
protected MainListSelecte dEventHandler MainListSelecte dEvent;
protected event MainListSelecte dEventHandler MainListSelecte d
{
add { MainListSelecte dEvent =
(MainListSelect edEventHandler) System.Delegate .Combine(MainLi stSelectedEvent *,

value); }
remove { MainListSelecte dEvent =
(MainListSelect edEventHandler) System.Delegate .Remove(MainLis tSelectedEvent,

value); }
}
protected delegate void MainListSelecti onChangedEventH andler(string
sSelected, object Item);
private MainListSelecti onChangedEventH andler
MainListSelecti onChangedEvent;
protected event MainListSelecti onChangedEventH andler
MainListSelecti onChanged
{
add { MainListSelecti onChangedEvent =
(MainListSelect ionChangedEvent Handler)System. Delegate.Combin e(MainListSelec *tionChangedEve nt,

value); }
remove { MainListSelecti onChangedEvent =
(MainListSelect ionChangedEvent Handler)System. Delegate.Remove (MainListSelect *ionChangedEven t,

value); }
}
private void mainList_LeaveC ontrol(Directio n direction)
{
............... ...........
}
private void mainList_Select ed(string sSelected, object Data)
{
if (MainListSelect edEvent != null)
MainListSelecte dEvent(sSelecte d, Data);
}

}

DisplayPage is then overridden and called from different type of pages
that inherit from page.

regards
bryan

[c#2006user]

oh ya its the MainListSelecte dEvent thats null when i try and call it.

any help really appreciated!

thanks.