DynamicResource Key from Binding in MarkupExtension

[tcs-1986]

Code

public class DynamicResourceBindingExtension : MarkupExtension
{

    public DynamicResourceBindingExtension()
    {
    }

    public DynamicResourceBindingExtension(Binding? binding)
    {
        Binding = binding;
    }

    [ConstructorArgument("binding")]
    public Binding? Binding { get; set; }

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        if (Binding == null)
            return null;

        var target_provider = (IProvideValueTarget?)serviceProvider.GetService(typeof(IProvideValueTarget));
        var target_element = target_provider?.TargetObject;
        var target_property = target_provider?.TargetProperty;

        if (target_property is ClrPropertyInfo clrprop)
        {
            
        }

        var resource_key = // Get Value From Binding ???

        return new DynamicResourceExtension(resource_key);
    }
}

XAML

<Style Selector="MenuItem">
	<Setter Property="Header" Value="{t:DynamicResourceBinding Binding={Binding Key}}" />
	<Setter Property="Command" Value="{Binding Command}" />
	<Setter Property="InputGesture" Value="{Binding Gesture}" />
	<Setter Property="HotKey" Value="{Binding Gesture}" />
	<Setter Property="IsEnabled" Value="{Binding IsEnabled}" />
	<Setter Property="IsVisible" Value="{Binding IsVisible}" />
	<Setter Property="ItemsSource" Value="{Binding SubItems}" />
</Style>

How can I get the value from the binding?

Thanks!

[maxkatz6]

You can't get value from a binding, since binding is dynamic, and might not have initial value (if datacontext wasn't set yet).