Instantiates an AttachmentBase with the specified Stream and media type.
A stream containing the content for this attachment.
The MIME media type of the content.
contentStream is null.
mediaType is not a valid value.
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.