Gets a XamlDirective for the UnknownContent directive from XAML.
Assembly: System.Xaml (in System.Xaml.dll)
UnknownContent is a directive that is a placeholder to use in a XAML node set if a reader encounters unknown content for a value node or initialization text (no available intrinsic or text syntax can convert it).
If you are looking at raw node interpretations or visualizations, UnknownContent is sometimes seen in string form as _UnknownContent (note the leading underscore) and is within the XAML language XAML namespace (as notated by a preceding Namespace node).
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)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.