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.NET Forum / Languages / C# / August 2006

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DataSet.XmlReader hangs when & is in string within XML file

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SteveT - 18 Aug 2006 22:13 GMT
I am trying to create a dataset from an XML file.  When calling
myDataSet.ReadXml("sample.xml") the code produces an exception error.  The
XML file has many strings that identify pnp ids on a system.  These string
values contain multiple "&" signs within them (e.g.
<pnpid>PCI\VEN_1000&DEV_8000&SUDEV_1008<\pnpid>).  How can I correctly read
these pnp ids into a dataset?

I've tried using ReadXml with various stream readers(StreamReader or
TextReader) but they cause the same error.
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-----------
Thanks,
Steve

Marc Gravell - 18 Aug 2006 22:23 GMT
Well, the data simply isn't XML. Rather than trying to "fix" the reader
*correctly* telling you this, I'd fix whatever is writing the invalid
"XML" files. It should read:
<pnpid>PCI\VEN_1000&amp;DEV_8000&amp;SUDEV_1008<\pnpid>

Which is read as an element "pnpid" with text content
"PCI\VEN_1000&DEV_8000&SUDEV_1008"

This is often caused by people using string concatenation to write
"xml", instead of (e.g.) XmlWriter (which would have dealt with this
automatically).

Marc
Marc Gravell - 18 Aug 2006 22:25 GMT
Eeks it gets worse: I didn't spot it first time: the trailing slash is
in the wrong direction too!!!!

<pnpid>PCI\VEN_1000&amp;DEV_8000&amp;SUDEV_1008</pnpid>

Marc
SteveT - 18 Aug 2006 22:38 GMT
This makes a lot of sense.  I changed my sample file to & and it worked just
fine.  I will be creating the "writer" as well so this will be taken into
account.  Thanks very much.
Signature

-----------
Thanks,
Steve

> Eeks it gets worse: I didn't spot it first time: the trailing slash is
> in the wrong direction too!!!!
>
> <pnpid>PCI\VEN_1000&DEV_8000&SUDEV_1008</pnpid>
>
> Marc
Kevin Yu [MSFT] - 21 Aug 2006 02:09 GMT
Hi Steve,

Yes, as Marc said, the & char is a reserved word in XML. So it will be
better to use an XmlWriter or XmlDocument to generate XML files. They will
automatically escape the reserved words for you.

Kevin Yu
Microsoft Online Community Support

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