When overridden in a derived class, adds the attributes of the inheriting class to the specified list of attributes in the parent class.
Assembly: System (in System.dll)
For duplicate attributes, the last one added to the list is kept.
The IList with the attributes is created once. If there are duplicate attributes in the list, only the first instance is saved; all subsequent duplicate attributes are removed from the list.
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.