///
 /// 截前后字符(串)
 ///
 ///原字符串
 ///要截掉的字符串
 ///是否贪婪
 ///
        private string GetString(string val,string str,bool all)
        {
            return Regex.Replace(val, @"(^(" + str + ")" + (all ? "*" : "") + "|(" + str + ")"+(all ? "*" : "") + "$)", "");
        }

        ///
        ///
        ///
        /// 原字符串
        /// 要截取的字符
        ///
        private string GetString(string val,char c)
        {
            return val.TrimStart(c).TrimEnd(c);
        }