Returns whether this XamlMember represents a member that is not resolvable by the backing system that is used for type and member resolution.
Assembly: System.Xaml (in System.Xaml.dll)
This method may be invoked when a caller gets a value from IsUnknown. The default implementation returns results that are based on either internal reflection or checking for a null value of UnderlyingMember, processing in that order.
Override this method if you want to report uniform results for an entire XamlMember derived class, or if you have specialized metadata available to determine this on a per-case basis.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)