hexadecimal value 0x0C, is an invalid character-如何去除XML无效字符

public static string CleanInvalidXmlChars(string text)  
  {  
      // From xml spec valid chars:  
      // #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]    #x2  
      // any Unicode character, excluding the surrogate blocks, FFFE, and FFFF.  
      string re = @"[^\x09\x0A\x0D\x20-\xD7FF\xE000-\xFFFD\x10000-x10FFFF]";  
      return Regex.Replace(text, re, "");  
  } 

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