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POSelect multiple elements with Linq to XML
 

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    <p>I have a C# application and need to extract multiple elements from a Linq to XML collection.</p> <p>I have the following extract from an XML file</p> <pre><code> &lt;SNS&gt; &lt;uniqueSystem&gt;&lt;system&gt;49&lt;/system&gt;&lt;label&gt;Engines&lt;/label&gt; &lt;uniqueSubsystem&gt;&lt;subsystem&gt;30&lt;/subsystem&gt;&lt;label&gt;APU&lt;/label&gt; &lt;uniqueUnit&gt;&lt;unit&gt;00&lt;/unit&gt;&lt;label&gt;Starter&lt;/label&gt; &lt;/uniqueUnit&gt; &lt;/uniqueSubsystem&gt; &lt;/uniqueSystem&gt; &lt;uniqueSystem&gt;&lt;system&gt;50&lt;/system&gt;&lt;label&gt;Hydraulics&lt;/label&gt; &lt;uniqueSubsystem&gt;&lt;subsystem&gt;30&lt;/subsystem&gt;&lt;label&gt;Reservoir&lt;/label&gt; &lt;uniqueUnit&gt;&lt;unit&gt;00&lt;/unit&gt;&lt;label&gt;Pump&lt;/label&gt; &lt;/uniqueUnit&gt; &lt;/uniqueSubsystem&gt; &lt;/uniqueSystem&gt;&lt;/SNS&gt; </code></pre> <p>I need to extract the values from within each 'uniqueSystem' element. So in the example above, under the 'SNS' element there are 2 'uniqueSystem' elements, and within each of these there are 'uniqueSubsystem' elements and 'uniqueUnit' elements each with 'label' elements. I need to extract this data to build a TreeView.</p> <p>My problem is extracting multiple elements using Linq. How do i do this?</p> <p>At the moment i have </p> <pre><code>var item = from items in doc.Descendants("SNS").Descendants("uniqueSystem").Descendants("system") orderby items.Value select items.Descendants("uniqueSystem"); </code></pre> <p>I think this will give me a collection of the 'uniqueSystem' elements, from which i now need to extract the values of the multiple elements within. Can anybody please help?</p> <p>My next attmpt is as follows, but this is giving me a null reference exception:</p> <pre><code>var item = from items in doc.Descendants("SNS").Descendants("uniqueSystem").Descendants("system") orderby items.Value select items.Descendants("uniqueSystem"); foreach (var e in item) { string sys = e.Descendants("system").FirstOrDefault().Value; string sysLabel = e.Descendants("system").Descendants("label").FirstOrDefault().Value; string subsys = e.Descendants("subsystem").FirstOrDefault().Value; string subsysLabel = e.Descendants("subsystem").Descendants("label").FirstOrDefault().Value; string unit = e.Descendants("unit").FirstOrDefault().Value; string unitLabel = e.Descendants("unit").Descendants("label").FirstOrDefault().Value; buildSystemNodes(sys, sysLabel); //getSubSystems(myitem); } </code></pre>
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    1. USJLRishe
    1. USDaedalus
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    1. COCare to use `XmlSerializer`? Because only `XmlSerializer` that I know
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      1. USFendy
    2. CO@Fendy - i've never used it, is that a solution?
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      1. USDaedalus
    3. COdid you try this link: http://www.codeproject.com/Tips/146324/Reading-XML-documents-using-LINQ
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      1. USSaravanan
 

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