[ Version ( since = "0.4.0" ) ]
public int length { get; set; }
Indicates an advisory length of the linked content in octets.
<code class="literal">-1</code> means the length is unspecified.
For more information, see the <ulink type="http" url="http://www.atomenabled.org/developers/syndication/atom-format-spec.php#element.link">Atom specification</ulink>.