<winrt/Microsoft.UI.Xaml.Interop.h> has no 'xaml_typename' identifier

[game1024]

Describe the bug

The <winrt/Microsoft.UI.Xaml.Interop.h> has not 'xaml_typename'. The only way I can use xaml_typename is that I must include <winrt/Windows.UI.Xaml.Interop.h>

You can see if I comment Windows.UI.Xaml.Interop.h，There will be an error message for xaml_typename

Steps to reproduce the bug

The <winrt/Microsoft.UI.Xaml.Interop.h> has not 'xaml_typename'. The only way I can use xaml_typename is that I must include <winrt/Windows.UI.Xaml.Interop.h>

You can see if I comment Windows.UI.Xaml.Interop.h，There will be an error message for xaml_typename

Expected behavior

No response

Screenshots

No response

NuGet package version

None

Windows version

No response

Additional context

No response

[DarranRowe]

This isn't a bug, since WinUI 3 also has no Microsoft.UI.Xaml.Interop.TypeName structure or Microsoft.UI.Xaml.Interop.TypeKind enumeration. WinUI 3 uses the System Xaml TypeName here.

To give some examples, the documentation for Microsoft.UI.Xaml.Markup.IXamlMetadataProvider.GetXamlType links the TypeName parameter to Windows.UI.Xaml.Interop.TypeName.

If you look at the same member in the C++/WinRT projection,

    template <typename D> auto consume_Microsoft_UI_Xaml_Markup_IXamlMetadataProvider<D>::GetXamlType(winrt::Windows::UI::Xaml::Interop::TypeName const& type) const
    {
        void* result{};
        check_hresult(WINRT_IMPL_SHIM(winrt::Microsoft::UI::Xaml::Markup::IXamlMetadataProvider)->GetXamlType(impl::bind_in(type), &result));
        return winrt::Microsoft::UI::Xaml::Markup::IXamlType{ result, take_ownership_from_abi };
    }

Finally, the metadata provided in Microsoft.UI.Xaml.winmd shows that this is not a mistake.

[game1024]

Thanks for your reply, and I want to know what is the best way for me to get xaml typename page in this situation. Cause I just hear about "don't use Windows.UI.Xaml" in WinUI3, but I can't find any sample c++ code for this logic

[DarranRowe]

You just use winrt::xaml_typename after including winrt/Windows.UI.Xaml.Interop.h.

You would really need to include this header to use Microsoft.UI.Xaml.Controls.Frame anyway.

The frame type, Microsoft.UI.Xaml.Controls.Frame uses Windows.UI.Xaml.Interop.TypeName to identify the page. Using winrt::xaml_typename will provide information that WinUI 3 can use to get the correct type. Including winrt/Windows.UI.Xaml.Interop.h and using winrt::xaml_typename is the correct thing to do here.

[game1024]

Thanks a lot