'Modern::ABI::Windows::Foundation::IReference<Modern::String>': no GUID has been associated with this object

[brucebob]

When trying to register a call back for a property change on a Text/Modern::String, I'm unable to get the value of the string. when I ran it to see the runtime class I got "Windows::Foundation::IReference'1"

        text.RegisterPropertyChangedCallback(text.TextProperty(), [](const DependencyObject& d, const DependencyProperty& p) 
        {
            const auto text_prop = d.GetValue(p);
            //text_prop.GetRuntimeClassName() = Windows::Foundation::IReference'1<String>
            const auto text_ref = text_prop.As<Windows::Foundation::IReference<String>>();
        });

The line with text_ref is giving me the compile error. 'Modern::ABI::Windows::Foundation::IReferenceModern::String': no GUID has been associated with this object

[kennykerr]

I'm not sure why you want to query for IReference. You can get the property value as follows:

text.RegisterPropertyChangedCallback(text.TextProperty(), [](DependencyObject const & d, DependencyProperty const & p)
{
    using namespace Windows::Foundation;

    IPropertyValue value = d.GetValue(p).As<IPropertyValue>();

    MODERN_TRACE(L"> %ls\n", value.GetString().Buffer());
});

[brucebob]

I figured I was using it wrong. Thank you for the correction. Your trace function is very handy I've been using it since I've seen all of your pluralsight courses. Keep it up!

[kennykerr]

Thanks!