xml非法字符过滤

/// <summary>

        /// Whether a given character is allowed by XML 1.0.

        /// </summary>

        public static bool IsLegalXmlChar(int character)

        {

            return

            (

                 character == 0x9 /* == '\t' == 9   */          ||

                 character == 0xA /* == '\n' == 10  */          ||

                 character == 0xD /* == '\r' == 13  */          ||

                (character >= 0x20 && character <= 0xD7FF) ||

                (character >= 0xE000 && character <= 0xFFFD) ||

                (character >= 0x10000 && character <= 0x10FFFF)

            );

        }