COM Add-in by Using Visual C# .NET

[Peter]

Hello,

Thanks for reviewing my question. In reference to
knowledge base article: 302901 - HOW TO: Build an Office
COM Add-in by Using Visual C# .NET.

I followed the article and got everything work correctly
but of course I want to do more. If Outlook is loaded, I
assume the object applicationObject must be Outlook's
Application Object - Is this correct? Can I just cast it
to Outlook._Application object? I want to be able to be
able to create new contacts for instance.

Since this project started from a Shared Add-in, by
default VS.NET includes the Office.dll reference. When I
reference other Office 2003 programs like Access, Excel
and Outlook, doing so includes another reference
Microsoft.Office.Core. If I compile my program now, I
get multiple warnings:

'Microsoft.Office.Core.CommandBar' is defined in multiple
places; using definition
from 'c:\WINDOWS\Microsoft.NET\Framework\v1.1.4322
\office.dll'

What's wrong? I reference Access, Excel and Outlook in
order to gain access to their Application object.

Many Thanks to the Experts.
Peter

 

[Siew Moi Khor [MS]]

Hi Peter,
If you're developing for OL 2002 or OL 2003, it's best practice to always
use Office XP or Office 2003 PIAs respectively. See the post entitled: Fw:
..Net Office AddIn Failure in this newsgroup for more info on getting and
using those PIAs.

Also you might want to take a look at the wlakthrough below. Thanks.
http://msdn.microsoft.com/library/en-us/dnoxpta/html/odc_dnscof.asp

Siew Moi

 

[Peter]

Siew,

Thanks for article. Its just what I needed.

Peter

 

[Peter]

Siew,

Glancing at the article, I noticed the following code
segment:
applicationObject = (Outlook.Application)application;

What actually am I assigning - a pointer, a reference?

I ask this because if I ever need to pass this
applicationobject to a function, I want to know if I
should being passing it as a reference or by value.

Thanks
Peter

 

[Siew Moi Khor [MS]]

Hi Peter,
You are casting a value object passed to the .NET class via COM Interop.
Passing it either by ref or by val to other functions in the application is
a matter of choice.

Siew Moi