如何将百分数字符串转换为数值
string   s   =    "80% "; 
 double   d   =   Convert.ToDouble(s);   
 出错. 
 如何实现?
------解决方案--------------------string s =  "80% "; 
 double d = Convert.ToDouble(s.TrimEnd( '% ')) / 100; 
 Text = d.ToString(); 
------解决方案--------------------Convert.ToDecimal(s.TrimEnd( '% '))/100