Bug: AOT doesn't work with interfaces

[lyf6lyf]

Description

My code is like below

    public class Parent { }
    public sealed class Child : Parent { }
    public static class Example
    {
        public static Child GetChild() {  return new Child(); }
    }

But it doesn't compile because "error CsWinRT1005: Exporting unsealed types is not supported in CsWinRT, please mark type Parent as sealed"
I use interfaces as workaround, and change my code to

    public interface IParent {}
    public interface  IChild : IParent {}
    internal partial class Parent : IParent {}
    internal partial class Child : Parent, IChild {}
    public sealed class Example
    {
        public static IChild GetChild() { return new Child(); }
    }

And it works well.

Next, I enable AOT following https://github.com/MichalStrehovsky/CppPublishAotReference
When I run the code, I see below error:
Exception thrown at 0x00007FFC28D2837A (KernelBase.dll) in CppConsoleApp.exe: WinRT originate error - 0x80004002 : 'Failed to create a CCW for object of type 'AuthoringDemo.Parent' for interface with IID 'F4D7DFF0-F052-5B09-8FB3-7B563C3D0E1C': the specified cast is not valid.'.
Exception thrown at 0x00007FFC28D2837A (KernelBase.dll) in CppConsoleApp.exe: WinRT originate error - 0x80004002 : 'Failed to create a CCW for object of type 'AuthoringDemo.Child' for interface with IID '58D127C1-2630-5E63-8877-42BC48D395E8': the specified cast is not valid.'.

Steps To Reproduce

1. clone lyf6lyf@e05e589
2. build and run \src\Samples\AuthoringDemo\CppConsoleApp\main.cpp

Expected Behavior

The code can run successfully.

Version Info

CsWinRT version: 2.2.0

DotNet version: net8.0-windows10.0.22621.0, net9.0-windows10.0.22621.0

Additional Context

No response

[hez2010]

Did you copy the produced winmd files to the directory of your executable file?

[lyf6lyf]

Did you copy the produced winmd files to the directory of your executable file?

@hez2010 I just tried but it still doesn't work.

[dongle-the-gadget]

This looks to be a generator miss. Can you confirm if adding this works for you?

[global::WinRT.WinRTExposedType(typeof(global::WinRT.AuthoringDemoVtableClasses.ABI_Impl_AuthoringDemo_ChildWinRTTypeDetails))]
partial class Child
{
}

namespace WinRT.AuthoringDemoVtableClasses
{
    internal sealed class ABI_Impl_AuthoringDemo_ChildWinRTTypeDetails: global::WinRT.IWinRTExposedTypeDetails
    {
        public global::System.Runtime.InteropServices.ComWrappers.ComInterfaceEntry[] GetExposedInterfaces()
        {
            return new global::System.Runtime.InteropServices.ComWrappers.ComInterfaceEntry[]
            {
                new global::System.Runtime.InteropServices.ComWrappers.ComInterfaceEntry
                {
                    IID = global::ABI.AuthoringDemo.IParentMethods.IID,
                    Vtable = global::ABI.AuthoringDemo.IParentMethods.AbiToProjectionVftablePtr
                },
                new global::System.Runtime.InteropServices.ComWrappers.ComInterfaceEntry
                {
                    IID = global::ABI.AuthoringDemo.IChildMethods.IID,
                    Vtable = global::ABI.AuthoringDemo.IChildMethods.AbiToProjectionVftablePtr
                },
            };
        }
    }
}