Hi all,

Does anyone a way to determine if a handler has been assigned to a delegate,
at runtime? I'm converting some C# code and it tests whether or not the
handler has been assigned. Unfortuntely, VB doesn't support the technique.

Thanks,

Doug

* "Doug" <(E-Mail Removed)> scripsit:
> Does anyone a way to determine if a handler has been assigned to a delegate,
> at runtime? I'm converting some C# code and it tests whether or not the
> handler has been assigned. Unfortuntely, VB doesn't support the technique.

You don't need to test that in VB. Simply use 'RaiseEvent'.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

Thanks for the quick response Herfried,

What I was looking for was a VB equivalent of this C# snippet. VB does
not allow testing the delegate for a handler. It assumes you want to
raise the event.

In hindsight, all it seems to do is not raise the event if no handler is
present. May not be worth the effort...

C#-------
public event QueryShowTheDragCursorEventHandler
QueryShowTheDragCursor;

protected virtual void
OnQueryShowTheDragCursor(QueryShowTheDragCursorEventArgs e)
{
//If handler present then raise the event
if(QueryShowTheDragCursor != null)
QueryShowTheDragCursor(this, e);

}



VB-----
Protected Overridable Sub OnQueryShowTheDragCursor(ByVal e As
QueryShowTheDragCursorEventArgs)
If (Not QueryShowTheDragCursor Is Nothing) Then
RaiseEvent QueryShowTheDragCursor(Me, e)
End If
End Sub


Thanks for your time,

Doug

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* Doug <(E-Mail Removed)> scripsit:
> What I was looking for was a VB equivalent of this C# snippet. VB does
> not allow testing the delegate for a handler. It assumes you want to
> raise the event.
>
> In hindsight, all it seems to do is not raise the event if no handler is
> present. May not be worth the effort...
> If (Not QueryShowTheDragCursor Is Nothing) Then
> RaiseEvent QueryShowTheDragCursor(Me, e)

The 'If...Then...' is not required.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>