x:Bind code generation does not recognize dynamic type #10362
Description
Describe the bug
The x:Bind code generation process fails to recognize properties on dynamic type.
Steps to reproduce the bug
Create a class type called PageTag derived from DynamicObject and implementing ICustomPropertyProvider. Create a Page-derived class called PageBase with a DependencyProperty that holds a PageTag and accessed through dynamic type:
public dynamic? PageTag {
get { return (PageTag?)this.GetValue(PageTagProperty); }
set { this.SetValue(PageTagProperty, value); }
}
public static DependencyProperty PageTagProperty { get; } = DependencyProperty.Register(nameof(PageBase.PageTag), typeof(PageTag), typeof(PageBase), new PropertyMetadata(default(PageTag)));
Assign an instance of PageTag to the PageTag property, such that the instance object has a dynamically defined string property called 'Name'. Now try binding to PageTag.Name using Binding and x:Bind, e.g.:
<TextBlock Text="{Binding PageTag.Name, Mode=OneWay, FallbackValue={x:Null}}" />
<TextBlock Text="{x:Bind PageTag.Name, Mode=OneWay, FallbackValue={x:Null}}" />
The use of Binding works (assuming that DataContext is set correctly). The x:Bind fails at compile time with the message "XamlCompiler error WMC1110: Invalid binding path 'PageTag.Name' : Property 'Name' not found on type 'Object'."
Expected behavior
The message shows that x:Bind is mistakenly replacing 'dynamic' with 'object'. The x:Bind should use the dynamic type in this case, not Object type. It should compile and run.
Screenshots
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NuGet package version
None
Windows version
No response
Additional context
No response