Bug: WebAuthenticationCoreManagerInterop does not work if AOT is enabled

[lhak]

Description

Calling WebAuthenticationCoreManagerInterop.RequestTokenForWindowAsync() results in the following error message if AOT is enabled:

Cannot retrieve a helper type for generic public type 'Windows.Foundation.IAsyncOperation`1[Windows.Security.Authentication.Web.Core.WebTokenRequestResult]'

Steps To Reproduce

1. Call WebAuthenticationCoreManagerInterop.RequestTokenForWindowAsync()

Expected Behavior

Should work as with AOT disabled

Version Info

cswinrt 2.2
.net windows sdk 10.0.22621.56

Additional Context

No response

[lhak]

I found a (complicated) workaround:

• Copy definition of IWebAuthenticationCoreManagerInterop from WinRT.Interop.idl into a separate file with a new namespace
• Change return type from Object to the correct one (IAsyncOperation<WebTokenRequestResult>)
• Generate a winmd file (e.g. by adding the idl file to a c++ project)
• Run cswinrt on the winmd file to create the projection files
• Copy the generated .cs files to the application project
• Copy the related code from ComInteropHelpers.cs and update it to use the generated code for the interface

So I guess updating the return types in cswinrt will be enough to fix this issue?