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c#xpathlinq-to-xml
user1806245
user1806245

Reputation: 97

How to write xpath for this XDocument?

    <tags>
    <data mode="add" name="ttt" oldindex="-1" index="-1" oldnumber="1" number="1"               type="VAR_INT" value="72" /> 
     <data mode="delete" name="test3d" oldindex="-1" index="-1" oldnumber="1" number="1"            type="VAR_INT" value="72" /> 
      </tags>

I want to check whether "mode" is present in xml or not

        xdDiffData.XPathSelectElement("//tags[@mode='add']") != null &&        xdDiffData.XPathSelectElement("//tags[@mode='delete']") != null

This always gives false..how to do this... ?

Upvotes: 1

Views: 573

Answers (4)

Dimitre Novatchev
Dimitre Novatchev

Reputation: 243459

I want to check whether "mode" is present in xml or not

Use:

//@mode

if this XPath expression selects a node, this means that an attribute named mode is present in the XML document.

or you could use:

boolean(//@mode)

and this produces a boolean value -- true() or false()

Upvotes: 0

Furqan Safdar
Furqan Safdar

Reputation: 16698

If you want to make sure that mode attribute is present in every data element, then you should better iterate all the data elements to look for the mode attribute this way:

XDocument doc = XDocument.Load("XmlFile.xml");
var nodes = doc.Descendants("data");

foreach (var node in nodes)
{
    var attrMode = node.Attribute("mode");
    if (attrMode == null)
    {
        // mode attribute is not available for this data element
    }
}

Using Linq:

if (nodes.Where(c => c.Attribute("mode") == null).Count() == 0)
{
    var result = nodes.All(e => 
                           e.Attribute("mode").Value.Equals("add") ||
                           e.Attribute("mode").Value.Equals("delete"));
} 
else
{
    // 'mode' attribute is missing for one or more 'data' element(s)
}

If result equals to true, then it means all the data elements have mode attribute either set to value "add" or "delete".

Upvotes: 2

user1806245
user1806245

Reputation: 97

    xdDiffData.XPathSelectElement("/tags/data[@mode='add']") != null

Upvotes: 0

Darren Reid
Darren Reid

Reputation: 2322

You are missing the 'data' element. Try

xdDiffData.XPathSelectElement("//tags/data[@mode='add']") != null &&        xdDiffData.XPathSelectElement("//tags/data[@mode='delete']") != null

Upvotes: 0

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