Xml Node Access

[sitemap]

Hello.

I have a problem to accessing the right clindNodes from the xml.
I have many "step" elements with id.
I want to get the attributes from the 5 "matrix" elements, depending on
parent "step" id ( example - if some var(MyVariable) = 2, the code
should get the 5 matrix attributes that have a parent <step id="2" >).
My codea always returning the 5 matrix attributes only from step
id="1", and does not mather that i change the MyVariable to 2, 3 ..
Please help

This is my code:

mainForm.xmldoc = new XmlDocument();
mainForm.xmldoc.Load("file.xml");
XmlNode onode = mainForm.xmldoc.DocumentElement;

XmlNodeList xmlnode =
mainForm.xmldoc.GetElementsByTagName("step");
for (int i = 0; i < xmlnode.Count; i++)
{
XmlAttributeCollection xmlattrc =
xmlnode[i].Attributes;
if (xmlnode[i].Attributes[0].Value.ToString() ==
MyVariable)
{
matnode =
mainForm.xmldoc.GetElementsByTagName("matrix");

for (int a = 0; a < matnode.Count; a++ ) {
matatt = matnode[a].Attributes;

}
}
}
there is the part of the xml:

<?xml version="1.0"?>
<DocRoot>
<steps>
<step id="1">
<matrixs>
<matrix mrp="20" i="100,5" lf="10,2" r="0,3" />
<matrix mrp="40" i="300" lf="50" r="20" />
<matrix mrp="60" i="500" lf="30" r="15" />
<matrix mrp="80" i="900" lf="20" r="8" />
<matrix mrp="100" i="1300" lf="90" r="52" />
</matrixs>
<vals it="0" mrp="20" soe="0" shi="0" irr="0" pp="0" />
</step>
<step id="2">
<matrixs>
<matrix mrp="20" i="100,5" lf="10,2" r="0,3" />
<matrix mrp="40" i="300" lf="50" r="20" />
<matrix mrp="60" i="500" lf="30" r="15" />
<matrix mrp="80" i="900" lf="20" r="8" />
<matrix mrp="100" i="1300" lf="90" r="52" />
</matrixs>
<vals it="0" mrp="20" soe="0" shi="0" irr="0" pp="0" />
</step>
..
..
<DocRoot>
Thanks in advance

[Larry Lard]

sitemap wrote:

Hello.

I have a problem to accessing the right clindNodes from the xml.
I have many "step" elements with id.
I want to get the attributes from the 5 "matrix" elements, depending on
parent "step" id ( example - if some var(MyVariable) = 2, the code
should get the 5 matrix attributes that have a parent <step id="2" >).
My codea always returning the 5 matrix attributes only from step
id="1", and does not mather that i change the MyVariable to 2, 3 ..
Please help

This is my code:

mainForm.xmldoc = new XmlDocument();
mainForm.xmldoc.Load("file.xml");
XmlNode onode = mainForm.xmldoc.DocumentElement;

XmlNodeList xmlnode =
mainForm.xmldoc.GetElementsByTagName("step");
for (int i = 0; i < xmlnode.Count; i++)
{
XmlAttributeCollection xmlattrc =
xmlnode[i].Attributes;
if (xmlnode[i].Attributes[0].Value.ToString() ==
MyVariable)
{
matnode =
mainForm.xmldoc.GetElementsByTagName("matrix");

This line is wrong. It means you are always getting the first matrix
nodes from the *document*, not from underneath the particular step node
you've just found. I think you want to cast xmlnode[i] to XmlElement,
then invoke GetElementsByTagName on that, rather than on xmldoc.

Or you could just use XPath on the original document, couldn't you?
--
Larry Lard
Knows enough XML to be dangerous
Replies to group please

[sitemap]

Thank you Larry.

I never beeen using the Xpath in the C# - only in my Perl codes and i
think that it will be dificult for me.
May be i will try the other way. but i cannot find the info, how to
cast xmlnode to XmlElement. Can you tell me - from where i can find the
info in the net or msdn - url or name of the method or other?

Larry Lard wrote:

sitemap wrote:

Hello.

I have a problem to accessing the right clindNodes from the xml.
I have many "step" elements with id.
I want to get the attributes from the 5 "matrix" elements, depending on
parent "step" id ( example - if some var(MyVariable) = 2, the code
should get the 5 matrix attributes that have a parent <step id="2" >).
My codea always returning the 5 matrix attributes only from step
id="1", and does not mather that i change the MyVariable to 2, 3 ..
Please help

This is my code:

mainForm.xmldoc = new XmlDocument();
mainForm.xmldoc.Load("file.xml");
XmlNode onode = mainForm.xmldoc.DocumentElement;

XmlNodeList xmlnode =
mainForm.xmldoc.GetElementsByTagName("step");
for (int i = 0; i < xmlnode.Count; i++)
{
XmlAttributeCollection xmlattrc =
xmlnode[i].Attributes;
if (xmlnode[i].Attributes[0].Value.ToString() ==
MyVariable)
{
matnode =
mainForm.xmldoc.GetElementsByTagName("matrix");

This line is wrong. It means you are always getting the first matrix
nodes from the *document*, not from underneath the particular step node
you've just found. I think you want to cast xmlnode[i] to XmlElement,
then invoke GetElementsByTagName on that, rather than on xmldoc.

Or you could just use XPath on the original document, couldn't you?
--
Larry Lard
Knows enough XML to be dangerous
Replies to group please

[Larry Lard]

sitemap wrote:

Thank you Larry.

I never beeen using the Xpath in the C# - only in my Perl codes and i
think that it will be dificult for me.
May be i will try the other way. but i cannot find the info, how to
cast xmlnode to XmlElement.

Just change

matnode =
mainForm.xmldoc.GetElementsByTagName("matrix");

to

matnode =
((XmlElement)xmlnode[i]).GetElementsByTagName("matrix");

And you should really take fifteen minutes to look up the syntax for
using XPath - what you are doing here is what XPath is for. Even I've
managed to get some XPath stuff working, and I'm just a dumb VB
programmer.

--
Larry Lard
Replies to group please

[sitemap]

Thank you!!

but i found ather way to do this ( it is little longer .. but works :)
)

private XmlAttributeCollection _a;
public XmlAttributeCollection popvals(int ind)
{
mainForm.xmldoc = new XmlDocument();
mainForm.xmldoc.Load(mainForm.pdir);
XmlNode onode = mainForm.xmldoc.DocumentElement;
XmlAttributeCollection xmlattrc;
XmlNodeList xmlnode =
mainForm.xmldoc.GetElementsByTagName("step");
for (int i = 0; i < xmlnode.Count; i++)
{
xmlattrc = xmlnode[i].Attributes;
if (xmlnode[i].Attributes[0].Value.ToString() ==
ind.ToString())
{
_a = xmlnode[i].ChildNodes[1].Attributes;
}
}
mainForm.xmldoc = null;
return _a;
}

Thank you again.
Niky
Larry Lard wrote:

sitemap wrote:

Thank you Larry.

I never beeen using the Xpath in the C# - only in my Perl codes and i
think that it will be dificult for me.
May be i will try the other way. but i cannot find the info, how to
cast xmlnode to XmlElement.

Just change

matnode =
mainForm.xmldoc.GetElementsByTagName("matrix");

to

matnode =
((XmlElement)xmlnode[i]).GetElementsByTagName("matrix");

And you should really take fifteen minutes to look up the syntax for
using XPath - what you are doing here is what XPath is for. Even I've
managed to get some XPath stuff working, and I'm just a dumb VB
programmer.

--
Larry Lard
Replies to group please