Linq to check child element exist in parent node

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XML

<w:p w:rsidR="00DC605B" w:rsidP="00A60D85" w:rsidRDefault="009A6F33">
      <w:r>
        <w:rPr>
          <w:bCs />
          <w:sz w:val="24" />
          <w:szCs w:val="24" />
        </w:rPr>
        <w:t>Flow rate</w:t>
      </w:r>
      <w:r>
        <w:rPr>
          <w:bCs />
          <w:sz w:val="24" />
          <w:szCs w:val="24" />
        </w:rPr>
        <w:tab />
      </w:r>
      <w:r>
        <w:rPr>
          <w:bCs />
          <w:sz w:val="24" />
          <w:szCs w:val="24" />
        </w:rPr>
        <w:tab />
        <w:t xml:space="preserve">: 0.8 </w:t>
      </w:r>
      <w:r>
        <w:rPr>
          <w:bCs />
          <w:color w:val="000000" />
          <w:sz w:val="24" />
          <w:szCs w:val="24" />
        </w:rPr>
        <w:t>ml/min</w:t>
      </w:r>
    </w:p>

i want to check whether  both 
        w:tab
        w:t xml:space="preserve">: 0.8 w:t
tags exist in  <w:r>

What I have tried:

i have tried many linq queries but not succeeded

Posted 10-Jun-16 20:31pm

kedar001

Updated 10-Jun-16 21:57pm

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Comments

George Jonsson 11-Jun-16 2:58am

Your XML is not valid without a declaration of the namespace 'w'

George Jonsson 11-Jun-16 3:08am

Is it enough to look for the elements <w:tab> and <w:t> or do you need to check the attribute as well?

kedar001 11-Jun-16 3:12am

Thanks for the reply.
No I don't need to check attributes just want to check nodes exist .

2 solutions

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George Jonsson · Answer 1 · 2016-06-10T21:57:00

As you don't state how you want to use the result, I just created a list of booleans

C#

XNamespace xns = "http://www.somesite.com/";
XDocument xdInput = XDocument.Load(@"C:\Temp\input.xml");
XElement xeWP = xdInput.Root.Element(xns + "p");

var existList = from el in xeWP.Elements(xns + "r")
        select (el.Element(xns + "tab") != null && el.Element(xns + "t") != null);

To make it work I enclosed your XML data in a new root element

XML

<root xmlns:w="http://www.somesite.com/">
    <w:p w:rsidR="00DC605B" w:rsidP="00A60D85" w:rsidRDefault="009A6F33">
        ...
    </w:p>
</root>

This snippet just prints out the result:

C#

for (int i = 0; i < existList.Count(); i++)
    Console.WriteLine("Item {0} : {1}", i + 1, existList.ElementAt(i));

RickZeeland · Answer 2 · 2016-06-10T21:35:00

If you must use LINQ (although this would be easier with System.IO.File.ReadAllLines)

C#

//Load xml
XDocument xdoc = XDocument.Load("LinqTest1.xml");

//Run query
var lv1s = from lv1 in xdoc.Descendants("tab")
           select new
           {
               val = lv1.Value
           };

foreach (var lv1 in lv1s)
{
    Debug.Print(lv1.val);
}

This code won't work with your xml, take a look here for information about namespaces:
How to: Control Namespace Prefixes (C#) (LINQ to XML)[^]
I only got it working by reformatting your xml like this:

<p>
<r>
<rPr>
<bCs />
<sz val="24" />
<szCs val="24" />
</rPr>
<t>Flow rate</t>
</r>
<r>
<rPr>
<bCs />
<sz val="24" />
<szCs val="24" />
</rPr>
<tab />
</r>
<r>
<rPr>
<bCs />
<sz val="24" />
<szCs val="24" />
</rPr>
<tab />
<t val="0.8" />
</r>
<r>
<rPr>
<bCs />
<color val="000000" />
<sz val="24" />
<szCs val="24" />
</rPr>
<t>ml/min</t>
</r>
</p>

Linq to check child element exist in parent node

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