Reading xml

[praveenkumar palla]

In my XML, for every node one optional attribute is there. I am trying to find that, specific node has that optional attribute or not at runtime but there are some issues Please help me on this Thanks in advance Praveenkumar Palla

[Scott Dorman]

What are the issues? You can't expect to get help if you don't identify the problem.

Scott.

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[praveenkumar palla]

my xml is like this In the above xml there two child nodes for node "tabular" . In that one node has "pwd" attribute and another one don't have, it is optional one. So I want to know that for the specific node the attribute is there or not at runtime----I tried like this XmlDocument xmldoc2 = new XmlDocument(); xmldoc2.LoadXml(objXmlTasks.decrypt()); XmlNodeList xmlchildnodelst = xmldoc2.SelectNodes("/lasers/laser [@LaserName='" + laseridval + "']/properties/tabular/property[@name='" + childLaserSelectedName + "']"); Password= xmlchildnodelst[0].Attributes.GetNamedItem("pwd").Value; But there is now pwd attribute for second one so exception "object reference null" PraveenKumar Palla

[praveenkumar palla]

my xml is like this In the above xml there two child nodes for node "tabular" . In that one node has "pwd" attribute and another one don't have, it is optional one. So I want to know that for the specific node the attribute is there or not at runtime----I tried like this XmlDocument xmldoc2 = new XmlDocument(); xmldoc2.LoadXml(objXmlTasks.decrypt()); XmlNodeList xmlchildnodelst = xmldoc2.SelectNodes("/lasers/laser [@LaserName='" + laseridval + "']/properties/tabular/property[@name='" + childLaserSelectedName + "']"); Password= xmlchildnodelst[0].Attributes.GetNamedItem("pwd").Value; But there is now pwd attribute for second one so exception "object reference null"

[Scott Dorman]

Yes, you can't do it this way. If GetNamedItem fails to find the attribute, it returns null, so the call to Value fails with the null reference exception. Instead, you need to do it like this:

XmlNode node = xmlchildnodelst[0].Attributes.GetNamedItem("pwd");

if (node != null)
{
// attribute exists, so retrieve the value
Password = node.Value;
}
else
{
// attribute doesn't exist
}

Also, please put the code blocks, including the xml, inside <pre> tags, which will keep the formatting and make it much easier to read.

Scott.

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