weixin
http://gongyi.gmw.cn/2013-12/02/content_9662228_26.htm
System.Object vs interface
http://developer.51cto.com/art/200908/147519.htm
http://www.cnblogs.com/whitewolf/archive/2012/05/23/2514123.html
出处:http://cnblogs.com/daishuguang