Iterate through xmldocument depending on value using LINQ in C#

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Hey guys,
I have xml looks like that:

XML

<Root>
  <Categories TopCategory="txt 1" MediumCategory="txt 2" SubCategory="txt 3" />
  <Categories TopCategory="txt 4" MediumCategory="txt 4" SubCategory="txt 5" />
  <Categories TopCategory="txt 7" MediumCategory="txt 8" SubCategory="txt 9" />
  <Categories TopCategory="txt 10" MediumCategory="txt 11" SubCategory="txt 12" />
  <Categories TopCategory="txt 13" MediumCategory="txt 14" SubCategory="txt 15" />
  <Categories TopCategory="txt 16" MediumCategory="txt 17" SubCategory="txt 18" />
</Root>

Now, the xml is passing to an XmlDocument object and what i want is extracting "TopCategory" & "MediumCategory" only where the value of "SubCategory" == "txt 12" (for example) using LINQ.
Any Ideas? please help....

What I have tried:

.......................................................

Posted 23-Feb-17 0:44am

oronsultan

Updated 6-Mar-17 7:34am

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Graeme_Grant · Answer 1 · 2017-02-23T00:52:00

Solution 1

This website will show you how: LINQ To XML Tutorials with Examples | DotNetCurry[^] - see point 5. "How Do I access Specific Element having a Specific Attribute using LINQ to XML" - easy to adapt to your requirements

Posted 23-Feb-17 0:52am

Graeme_Grant

Maciej Los · Answer 2 · 2017-03-06T07:34:00

As an alternative to solution 1 by Graeme_Grant[^], i'd like to say...

MSDN documentation is very good. I'd suggest to start with:
LINQ to XML Overview (C#)[^]
LINQ to XML (C#)[^]
Basic Queries (LINQ to XML) (C#)[^], especially: How to: Find an Element with a Specific Attribute (C#)[^]

I'd resolve your issue this way:

C#

string xcontent = @"<Root>
  <Categories TopCategory='txt 1' MediumCategory='txt 2' SubCategory='txt 3' />
  <Categories TopCategory='txt 4' MediumCategory='txt 4' SubCategory='txt 5' />
  <Categories TopCategory='txt 7' MediumCategory='txt 8' SubCategory='txt 9' />
  <Categories TopCategory='txt 10' MediumCategory='txt 11' SubCategory='txt 12' />
  <Categories TopCategory='txt 13' MediumCategory='txt 14' SubCategory='txt 15' />
  <Categories TopCategory='txt 16' MediumCategory='txt 17' SubCategory='txt 18' />
</Root>";

XmlReader rdr = XmlReader.Create(new StringReader(xcontent));
XDocument xdoc = XDocument.Load(rdr);

var result = xdoc.Descendants()
		.Where(x=>(string)x.Attribute("SubCategory")=="txt 12");

Above code should return (IEnumerable<XElement>):

<Categories TopCategory="txt 10" MediumCategory="txt 11" SubCategory="txt 12" />