c# can't read element attribute with xpath

Question

This code can't read a specific attribute - the name attribute more specifically. Instead it read the text of node elements and does a concat on them - result: 1F20 is added to the list

var reader = new StringReader(xml);
            var xmlreader = new XmlTextReader(reader);
            xmlreader.WhitespaceHandling = WhitespaceHandling.None;
            var doc = new XPathDocument(xmlreader);
            var nav = doc.CreateNavigator();
            XPathExpression expr = nav.Compile("/Area/Lights/Light[@Name]");
            XPathNodeIterator iterator = nav.Select(expr);

            var list = new List<string>();
            while (iterator.MoveNext())
            {
                XPathNavigator nav2 = iterator.Current.Clone();
                list.Add(nav2.Value);  
            }

I have also tried: XPathExpression expr = nav.Compile("//Light[@Name]");

which returns blank

This is the xml i am trying to read:

<Light Index="1" SetChannel="72" GetChannel="60" Name="y1 d1">
      <Nodes>1F</Nodes>
      <Nodes>20</Nodes>
    </Light>

What i am doing wrong - first attempt at xpath...

Pharabus · Accepted Answer · 2010-07-28 13:23:59Z

3

is this the full XML? using your snippet here this works

XPathExpression expr = nav.Compile("Light/@Name");

just to add the usage of XPathExpression expr = nav.Compile("/Area/Lights/Light[@Name]"); is a filter, you are asking for a Light node that has an attribute called Name, or you may do something like @Name = 'bob' where you ask for a Light node with an attribute of Name equal to Bob

answered Jul 28, 2010 at 13:23

Pharabus

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Comments

Tomalak · Accepted Answer · 2010-07-28 13:30:09Z

3

You're trying to read all Light-elements with a Name-attribute.

Try //Light[@Name='xyz']/@Name in order to read the Name-attribute from the Light-element where Name='xyz' or //Light/@Name for all Name-attributes.

Remember, [] is for conditions.

edited Jul 28, 2010 at 13:30

Tomalak

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answered Jul 28, 2010 at 13:26

atamanroman

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2 Comments

atamanroman Over a year ago

More copy&paste errors than grammar, but thanks for editing ;D

Tomalak Over a year ago

I just had to correct the "Your", it gave me the creeps. :D

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