XML Fragment into new XML Document

[gu4y]

Hello All,

What's the most efficient way to do this?

I would like to load an xml file like this:

<?xml version="1.0" encoding="utf-8" ?>
<strings>
<section key="1">
<string>sdfa</string>
<string>qwe</string>
</section>
<section key="2">
<string>iouio</string>
<string>kjhk</string>
</section>
<section key="3">
<string>asjhjk</string>
<string>mnwen</string>
</section>
</strings>

and then based on the "key," create a new xml document (either a string or
XmlDocument) from a fragment of the full document like this:

<?xml version="1.0" encoding="utf-8" ?>
<strings>
<section key="2">
<string>iouio</string>
<string>kjhk</string>
</section>
</strings>

Thanks in advance,

GY

[gu4y]

Here's what I've tried.

It works, but is it the most efficient? (The actual documents are much
larger)

XmlDocument xmlSrc = new XmlDocument();
xmlSrc.Load("myfile.xml");

string xpath = "strings/section[@key='2']";
XmlNode nodeSrc = xmlSrc.SelectSingleNode(xpath);

XmlDocument xmlDest = new XmlDocument();
xmlDest.LoadXml("<strings></strings>");
XmlNode nodeDest = xmlDest.ImportNode(nodeSrc, true);
xmlDest.DocumentElement.AppendChild(nodeDest);

"gu4y" <gu**@hotmail.com> wrote in message
news:#Q**************@TK2MSFTNGP10.phx.gbl...

Hello All,

What's the most efficient way to do this?

I would like to load an xml file like this:

<?xml version="1.0" encoding="utf-8" ?>
<strings>
<section key="1">
<string>sdfa</string>
<string>qwe</string>
</section>
<section key="2">
<string>iouio</string>
<string>kjhk</string>
</section>
<section key="3">
<string>asjhjk</string>
<string>mnwen</string>
</section>
</strings>

and then based on the "key," create a new xml document (either a string or
XmlDocument) from a fragment of the full document like this:

<?xml version="1.0" encoding="utf-8" ?>
<strings>
<section key="2">
<string>iouio</string>
<string>kjhk</string>
</section>
</strings>

Thanks in advance,

GY

[Oleg Tkachenko]

gu4y wrote:

It works, but is it the most efficient? (The actual documents are much
larger)

If you are talking about effectiveness, try to avoid using XmlDocument and
XPathDocument, because they load the whole XML document into the memory. In
your case it's possible to get the job done by simple XmlReader/XmlWriter filter:
namespace Test2 {
class Test {
static void Main(string[] args) {
string xml =
@"<strings>
<section key=""1"">
<string>sdfa</string>
<string>qwe</string>
</section>
<section key=""2"">
<string>iouio</string>
<string>kjhk</string>
</section>
<section key=""3"">
<string>asjhjk</string>
<string>mnwen</string>
</section>
</strings>";
XmlReader reader = new XmlTextReader(new StringReader(xml));

XmlWriter writer = new XmlTextWriter(Console.Out);
while (reader.Read()) {
if (reader.NodeType == XmlNodeType.Element && reader.Name ==
"strings") {
writer.WriteStartElement(reader.Name);
}
if (reader.NodeType == XmlNodeType.Element && reader.Name ==
"section" &&
reader["key"]=="2") {
writer.WriteNode(reader, true);
}
}
}
}
}

--
Oleg Tkachenko
http://www.tkachenko.com/blog
Multiconn Technologies, Israel