转转地址:http://www.cnblogs.com/promise-7/archive/2012/11/05/2755515.html
中文转Unicode:HttpUtility.UrlEncodeUnicode(string str);
转换后中文格式:"%uxxxx" 举例:"柳_abc123" 转换结果是:"%u67f3_abc123"
Unicode转中文1:HttpUtility.UrlDecode(string str);
str格式:"%uxxxx" ,举例:"%u67f3_abc123"
Unicode转中文2:Regex.Unescape(string str);
str格式:"sdfasdf\uxxxx" ,举例:"sdfasdf(\uxxxx对应的中文)"