写入XML 十六进制值 是无效的字符错误 解决方法

处理方法：在产生xml文件的时候，过滤低位非打印字符

 

public static string ReplaceLowOrderASCIICharacters(string tmp)
        {
            StringBuilder info = new StringBuilder();
            foreach (char cc in tmp)
            {
                int ss = (int)cc;
                if (((ss >= 0) && (ss <= 8)) || ((ss >= 11) && (ss <= 12)) || ((ss >= 14) && (ss <= 32)))
                    info.AppendFormat(" ", ss);//&#x{0:X};
                else info.Append(cc);
            }
            return info.ToString();
        }