This type or member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.
Assembly: WindowsBase (in WindowsBase.dll)
Windows 7, Windows Vista SP1 or later, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.