C++/CX component "public enum class" Does not link correctly in C# Metro App.

Question

Hi, i'm trying to wrap D3D11 calls in an API ive been developing.

Ive made a C++/CX component library that i'm trying to use in C#.  This is simple and straightforward if the C++/CX component and C# project are in the SAME solution, everything will work fine...

...but if I create my C++/CX API component in its OWN solution then create a second C# Metro App solution and add my C++/CX component "project" to it and then have my C# Metro App reference the C++/CX component project I get runtime errors when trying to use public enums that were declared in C++.

Here is the public enum class error that my C# app cant seem to link to.

"Could not find Windows Runtime type 'Reign.Video.D3D11.FeatureLevels'."

This is rly frustrating as I can't seem to get my C++/CX "API" stuff to link correctly in a C# app for TESTING.  How are you suppose to productively test an API made in C++ on metro??  You can't link a C++/CX component to a C# project unless there in the same solution and if you try to link the C++/CX project to the C# solution and link it from there you get runtime errors...

Answer 1

Hello,

 

Thanks for your feedback, I will involve more experts to investigate it.

 

Best regards,

Jesse

---

Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 2

I can't reproduce any problem here

public enum class FeatureLevels
{
	One,
	Two,
	Three
};

I can add a reference to this windows runtime component to both C# and C++ projects and reference the enum class without errors.

Can you give exact repro steps and errors?

Answer 3

Ok I figured out that when you use any other namespace other then that of the 'Project Name'... runtime linking(or something) does not work correctly. I'm going to send you a very simple demo for demonstration.

Download Demo 'http://www.reign-studios.com/Share/MetroDemo.zip'

Basically defining something like this in C++ will not link correctly at runtime in a C#(.NET) project.

namespace Reign

{namespace Video

{namespace D3D11

{

    public enum class FeatureLevels
    {
        D3D11_1,
        D3D11,
        D3D10_1,
        D3D10,
        ect...,
    };

}

}

}

Answer 4

My question was answered here: http://stackoverflow.com/questions/11805669/c-cx-component-public-enum-class-does-not-link-correctly-in-c-sharp-metro-ap/11853596#11853596

"Windows Runtime requires that all types must be found in a namespace that matches the name of the containing .winmd file"

I would recommend MS adding a compile time error for this situation, unless its technically unrealistic.