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Editorial Team
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Asked: 2026-05-29T06:59:50+00:00

I have this problem.. I’m receiving data from a client..Using a socket connection. But

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I have this problem.. I’m receiving data from a client..Using a socket connection. But this is not important. All the data is stored in an XML file using the XDocument object.
Sometimes when calling the XDocument.Save(filestream) and passing to it data with particular characters or symbols, I get an Exception like (invalid Hexadecimal character), it means that the XML file could not have some special characters ?
If so where can I find a list of this special characters that could generate such Exceptions?

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1 Answer

  1. Editorial Team

    Characters in the range [0x0-0x1F] are called control characters and excluding 0x9, 0xA, 0xD they cannot be used in XML.

    Here’s a quote from the XML specification:

    [Definition: A parsed entity contains text, a sequence of characters,
    which may represent markup or character data.] [Definition: A
    character is an atomic unit of text as specified by ISO/IEC 10646:2000
    [ISO/IEC 10646]. Legal characters are tab, carriage return, line feed,
    and the legal characters of Unicode and ISO/IEC 10646. The versions of
    these standards cited in A.1 Normative References were current at the
    time this document was prepared. New characters may be added to these
    standards by amendments or new editions. Consequently, XML processors
    must accept any character in the range specified for Char. ]

    Character Range

    Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] |
    [#xE000-#xFFFD] | [#x10000-#x10FFFF] /* any Unicode character,
    excluding the surrogate blocks, FFFE, and FFFF. */

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