Creating a Managed C++ interface to use in C#

Question

We have a collection of Native C++ business rules wrapped in C++/CLI and then by a C# layer so we can expose it via DCOM.

The Native C++ business rules are in a DLL and are easily invoked in C++/CLI which is in a COM visible DLL. We then add this DLL as a reference to the C# project.

The C# layer has a lot of classes derived from ServicedComponent and we apply regsvcs to get it registered as a DCOM server.

However a need has arisen for the C++/CLI layer to communicate to the C# layer. To do this I was thinking of using a C# style interface. The C# layer will derive from the interface and pass it down to the C++/CLI layer which can then call methods on it to get something to occur in the C# layer. This interface will need to be declared in the C++/CLI layer though for visibility. This is my problem I do not seem to be able to achieve this.

Is there a way to declare a C# style interface in C++/CLI and then use it in C#?

"Managed C++" refers to Visual C++ with Managed Extensions, as in Visual Studio .NET 2003. You probably mean its successor C++/CLI. If so, please reword and changed the tags. — Tom Blodget
– Tom Blodget, Commented May 21, 2015 at 23:02

jaket · Accepted Answer · 2015-05-21 23:58:48Z

2

There is (https://msdn.microsoft.com/en-us/library/737cydt1.aspx):

#pragma managed
using namespace System;

public interface class MyInterface
{
    void MyFunction();
}

And used in C#:

public class MyClass : MyInterface
{
    public void MyFunction() { }
}

edited May 21, 2015 at 23:58

answered May 21, 2015 at 23:04

jaket

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9 Comments

David Gray Wright Over a year ago

If I declare it like that I get. error CS0246: The type or namespace name 'MyInterface' could not be found (are you missing a using directive or an assembly reference?)

David Gray Wright Over a year ago

BTW The assembly and using statement are there. If I remove the method MyFunction from the class deriving off MyInterface I get Intellisense errors that "Interface member xxx is not implemented"

jaket Over a year ago

I edit the answer to show exactly what I've compiled without error. I'm using VS2013.

David Gray Wright Over a year ago

Okay but how is a C++/CLI Interface used in a C# assembly without error. I get errors for some reason.

jaket Over a year ago

You need a class to implement the interface.

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