C# COM call with Optional Parameter

[Binder]

I am trying to call an ActiveX DLL written in VB6 from my C# app.

The function call has a single parameter that is declared optional.

How do I call it from C#?

The VB function is:

Public Function GetTasks(Option al ByVal lngUserCode As Long) As
ADODB.Recordset

Thanks,

Rg

[Nicholas Paldino [.NET/C# MVP]]

Binder,

You will have to pass a value of zero to the method. If it was a
variant, then you would pass the value of System.Reflecti on.Missing.Valu e to
the parameter, to indicate it is truly missing. Because it is a long
though, it will get the default value of zero if it is not passed.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Binder" <rgondzur@NO_SP AM_aicsoft.com> wrote in message
news:OJ******** ******@TK2MSFTN GP12.phx.gbl...

I am trying to call an ActiveX DLL written in VB6 from my C# app.

The function call has a single parameter that is declared optional.

How do I call it from C#?

The VB function is:

Public Function GetTasks(Option al ByVal lngUserCode As Long) As
ADODB.Recordset

Thanks,

Rg

[Patty O'Dors]

C# doesn't understand optional parameters, the CCW "eats" the optional-ness
of it. Therefore you need to pass a value every time, even as others say it
be zero or Missing.Value.

"Binder" wrote:

I am trying to call an ActiveX DLL written in VB6 from my C# app.

The function call has a single parameter that is declared optional.

How do I call it from C#?

The VB function is:

Public Function GetTasks(Option al ByVal lngUserCode As Long) As
ADODB.Recordset

Thanks,

Rg