private double GetArea(ISpider spider, string link)
{
var estateDetail = spider.Grab(link);
// <dd class="titlew">占地面积</dd>
// <dd class="tidfes">490000平米 </dd>
var regex = new Regex("(?<=<dd\\s*class=\"titlew\">占地面积</dd>(.|\n)*?<dd\\s*class=\"tidfes\">)\\d+(?=平米)", RegexOptions.Compiled);
var match = regex.Match(estateDetail);
return(TryParseDouble(match.Value));
}