Generated Wrapper calls Marshal.GetNativeVariantForObject which is not supported

[zznty]

I was working with WebView2 COM wrappers and encountered an issue where calling CoreWebView2.AddHostObjectToScript which produces the following output

System.NotSupportedException: Built-in COM has been disabled via a feature switch. See https://aka.ms/dotnet-illink/com for more information.
   at System.Runtime.InteropServices.Marshal.GetNativeVariantForObject(Object obj, IntPtr pDstNativeVariant)
   at WinFormsComInterop.WebView2.ICoreWebView2Wrapper.webview2::Microsoft.Web.WebView2.Core.Raw.ICoreWebView2.AddHostObjectToScript(String name, Object& object)
   at Microsoft.Web.WebView2.Core.CoreWebView2.AddHostObjectToScript(String name, Object rawObject)

I assume COM wrappers source generator unintentionally emits a call into this method instead of using ComWrappers-specific code.

[kant2002]

I’m not sure that
A) you are using correct ComWrappers instance and
B) I have support only for Net 7. Have to finish interface implementation for Net 8 which is tiresome

can you tell me what TFM are you targeting? And how do you enable ComWrappers?

[zznty]

Looks like I was targeting net 8 as it has somewhat working built-in ComWrappers source generator. Probably would have to wait for you to add support of net 8.

[zznty]

An update for this issue. I had to write a source generator for IDispatch COM interface implementation and to get around that exception from Marshal.GetNativeVariantForObject, call ICoreWebView2 directly.