migrating vb6 optional parameters

[guy]

found this oddity-
copying a vb6 function with optional parameters and pasting it into a vb2003
class, for conversion purposes, it all works fine except that the collapsing
"-" on the LHS goes away, only to return if "Optional" is removed. Strange.
anyone else had this?

guy

[Larry Lard]

Re: migrating vb6 optional parameters


guy wrote:[color=blue]
> found this oddity-
> copying a vb6 function with optional parameters and pasting it into a vb2003
> class, for conversion purposes, it all works fine except that the collapsing
> "-" on the LHS goes away, only to return if "Optional" is removed. Strange.
> anyone else had this?[/color]

One thought: In VB6, you could just say "Optional param As type" and be
done with it, but in VB.NET "Optional parameters must specify a default
value" so if you just copy this valid in VB6) syntax into VB.NET:

Public Sub T(ByVal a As Integer, Optional ByVal g As Integer)

End Sub

you will get a squiggly line under the ), and no - collapsing section,
because it doesn't compile. Change it to eg

Public Sub T(ByVal a As Integer, Optional ByVal g As Integer = 0)

End Sub

and you get your - collapsing section.

--
Larry Lard
Replies to group please

[Herfried K. Wagner [MVP]]

Re: migrating vb6 optional parameters

"guy" <guy@discussion s.microsoft.com > schrieb:[color=blue]
> copying a vb6 function with optional parameters and pasting it into a
> vb2003
> class, for conversion purposes, it all works fine except that the
> collapsing
> "-" on the LHS goes away, only to return if "Optional" is removed.
> Strange.
> anyone else had this?[/color]

The "+" isn't shown as long as there is a compile-time error in your method
declaration. I assume you forgot to assign a value to the optional
parameter, which will fix the problem:

\\\
Public Sub Foo(Optional ByVal Number As Integer = 0)
...
End Sub
///

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

[guy]

Re: migrating vb6 optional parameters

Larry,Herfried, yes I thought that was the problem too but even with the
default in place no "-", however after removing the optional parameter
clicking on a different line and then replacing it it worked correctly.

guy

"Herfried K. Wagner [MVP]" wrote:
[color=blue]
> "guy" <guy@discussion s.microsoft.com > schrieb:[color=green]
> > copying a vb6 function with optional parameters and pasting it into a
> > vb2003
> > class, for conversion purposes, it all works fine except that the
> > collapsing
> > "-" on the LHS goes away, only to return if "Optional" is removed.
> > Strange.
> > anyone else had this?[/color]
>
> The "+" isn't shown as long as there is a compile-time error in your method
> declaration. I assume you forgot to assign a value to the optional
> parameter, which will fix the problem:
>
> \\\
> Public Sub Foo(Optional ByVal Number As Integer = 0)
> ...
> End Sub
> ///
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://classicvb.org/petition/>
>
>[/color]