Creating a COM Automation Server in C#

Question

I currently have a .NET class library written in C# that exposes its functionaility via COM to a C++ program (pre-.NET).

We now want to move the library out-of-proce

Answer 1

Your post started a while ago and I had the same problem. The following link is absolute gold and tells you everything

http://www.andymcm.com/blog/2009/10/managed-dcom-server.html

Answer 2

You can actually do this in .NET (I've done it before as a proof-of-concept), but it's a bit of work to get everything working right (process lifetime, registration, etc).

Create a new Windows application. In the Main method, call RegistrationServices.RegisterTypeForComClients- this is a managed wrapper around CoRegisterClassObject that takes care of the class factory for you. Pass it the Type of the managed ComVisible class (the one you actually want to create- .NET supplies the class factory automatically) along with RegistrationClassContext.LocalServer and RegistrationConnectionType.SingleUse. Now you have a very basic exe that can be registered as a LocalServer32 for COM activation. You'll still have to work out the lifetime of the process (implement refcounts on the managed objects with constructors/finalizers- when you hit zero, call UnregisterTypeForComClients and exit)- you can't let Main exit until all your objects are dead.

The registration isn't too bad: create a ComRegisterFunction attributed method that adds a LocalServer32 key under HKLM\CLSID(yourclsidhere), whose default value is the path to your exe. Run regasm yourexe.exe /codebase /tlb, and you're good to go.

Answer 3

Here is an article in MSDN that covers all aspects of how to create COM localserver in c# (.net): link

Answer 4

You could always expose your .NET class as COM classes using InteropServices and then configure the library as a COM+ application. The .NET library would run out-of-process and be hosted by a DLLHOST.EXE instance.