Selecting Node from xml file using xpath

Question

My XML file is as:

<?xml version="1.0" encoding="UTF-8"?>
   <Settings>
     <SurveySetting IsServeyOn="false" />
   </Settings>

I want to fetch the value of IsServeyOn.
I write the below code for that:

XmlDocument xmlDoc  = new XmlDocument();
xmlDoc.Load(filepath);
XmlElement root  = xmlDoc.DocumentElement;
XmlNode node  = root.SelectSingleNode("//SurveySetting");
RadiobuttonSurverysetting.SelectedValue  = node.Attributes["IsServeyOn"].Value;

But sometimes it gives me error.. Node not found or NUll.
Is any other way to select the node?

There are other ways, but your XPath expression is valid, and node being null indicates there is no <SurveySetting> element in your document. Are you absolutely sure that element is always present? — Frédéric Hamidi
– Frédéric Hamidi, Commented Sep 2, 2013 at 10:23
As @FrédéricHamidi said,Before setting the RadioButtonSurveySetting, check the Value with null.If it is not null then set it. — Naren
– Naren, Commented Sep 2, 2013 at 10:28
First search this way to avoid NULL.. Use //SurveySetting[not(@IsServeyOn)] — Arup Rakshit
– Arup Rakshit, Commented Sep 2, 2013 at 10:28
@Babai, do you mean //SurveySetting[@IsServeyOn], in case the element exists but its attribute doesn't? — Frédéric Hamidi
– Frédéric Hamidi, Commented Sep 2, 2013 at 10:32

Shreya · Accepted Answer · 2013-09-02 10:55:21Z

1

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(filepath);
XmlElement root = xmlDoc.DocumentElement;
XmlNode node = root.SelectSingleNode("SurveySetting");
if (node != null && node.Attributes.Count > 0 && node.Attributes["IsServeyOn"] != null && !string.IsNullOrEmpty(node.Attributes["IsServeyOn"].Value))
  {
        RadiobuttonSurverysetting.SelectedValue = node.Attributes["IsServeyOn"].Value;
  }

I have tried your code by putting some validations and it works fine in my application

answered Sep 2, 2013 at 10:55

Shreya

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