.NET MAUI 9: Bindings fallback to reflection-based bindings when path is invalid

[davidbritch]

In the cases when there is a binding with a Source but it inherits the x:DataType from the parent, there can often be a mismatch between the x:DataType and the type of the Source.

Sometimes customers want to reference another element and access its BindingContext ({Binding BindingContext.Title Source={x:Reference ...}}). Since we don't support casting in the path, XamlC won't be able to correctly resolve and build the property chain (in the example BindingContext is of type object and it doesn't have any property Title).

While there are workarounds to these issues, .NET MAUI 9 fallback to a reflection-based binding that will resolve the actual properties at runtime in these cases to keep the apps working and produce a warning so that users can either choose to ignore it or address it.

More info: dotnet/maui#24238