According to the Microsoft documentation, the .NET class
System.Xml.XmlWriter.WriteString() does the following:

"Character values in the range 0x-0x1F (excluding white space characters
0x9, 0xA, and 0xD) are replaced with numeric character entities (�
through &#0x1F)."

However, when we call WriteString() in an application we have written, we
are seeing the following exception being thrown:

System.ArgumentException: '', hexadecimal value 0x12, is an invalid
character.
at System.Xml.XmlUtf8RawTextWriter.InvalidXmlChar(Int 32 ch, Byte*
pDst, Boolean entitize)
at System.Xml.XmlUtf8RawTextWriter.WriteElementTextBl ock(Char* pSrc,
Char* pSrcEnd)
at System.Xml.XmlUtf8RawTextWriter.WriteString(String text)
at System.Xml.XmlUtf8RawTextWriterIndent.WriteString( String text)
at System.Xml.XmlWellFormedWriter.WriteString(String text)

Anyone ever seen anything like this? Any idea what I am doing wrong?

Tom Delany

Tom Delany wrote:
XmlTextWriter in the .NET framework 1.0/1.1 did that and XmlTextWriter
in the .NET framework 2.0 still does that but the normal XmlWriter you
create with e.g. XmlWriter.Create has been fixed to be compliant with
the XML 1.0 specification and to ensure (by default) that the output is
well-formed and even escaping those characters is not allowed in the XML
1.0 specification.
So use new XmlTextWriter to create an XmlTextWriter or if you want to
use XmlWriter.Create, then use XmlWriterSettings with CheckCharacters
set to false e.g.

XmlWriterSettings writerSettings = new XmlWriterSettings();
writerSettings.CheckCharacters = false;
using (XmlWriter xmlWriter = XmlWriter.Create("file.xml",
writerSettings))
{
// ...
}


--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

Tom Delany wrote:
XmlTextWriter in the .NET framework 1.0/1.1 did that and XmlTextWriter
in the .NET framework 2.0 still does that but the normal XmlWriter you
create with e.g. XmlWriter.Create has been fixed to be compliant with
the XML 1.0 specification and to ensure (by default) that the output is
well-formed and even escaping those characters is not allowed in the XML
1.0 specification.
So use new XmlTextWriter to create an XmlTextWriter or if you want to
use XmlWriter.Create, then use XmlWriterSettings with CheckCharacters
set to false e.g.

XmlWriterSettings writerSettings = new XmlWriterSettings();
writerSettings.CheckCharacters = false;
using (XmlWriter xmlWriter = XmlWriter.Create("file.xml",
writerSettings))
{
// ...
}


--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/