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POC# Linq to XML query only returning 1 result
 

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  1. POC# Linq to XML query only returning 1 result
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    <p>I have the following method which queries an XML file. I need it to return the information on ALL files which have the "System" element matching the 'sys' variable which i pass into my method.</p> <p>It works OK, but only returns 1 result, when i know that there is more than 1 match in the XML file.</p> <p>It's as if my Linq query just goes trhough the XML file until it finds a result then stops, whereas i need it to get a collection of ALL matches.</p> <pre><code>public ListViewItem getDMcollection(string sys) { XDocument doc = XDocument.Load(Form1.CSDBpath + Form1.projectName + "\\Data.xml"); var dms = from dm in doc.Descendants("dataModule") where dm.Descendants("system").First().Value == sys select dm; foreach (var module in dms) { ListViewItem item = new ListViewItem(new string[] { module.Element("DMC").Value, module.Element("techName").Value, module.Element("infoName").Value, module.Element("status").Value, module.Element("currentUser").Value, module.Element("validator").Value, module.Element("notes").Value, //dm.Element("size").Value + " kb", //dm.Element("dateMod").Value }); return item; } return null; } </code></pre> <p>This is a sample of the XML file:</p> <pre><code>&lt;DMs&gt; &lt;dataModule&gt; &lt;DMC&gt;DMC-AJ-A-29-13-54-00ZZZ-254Z-B_001-00.XML&lt;/DMC&gt; &lt;techName&gt;Pressure switch&lt;/techName&gt; &lt;infoName&gt;Clean mechanically&lt;/infoName&gt; &lt;system&gt;72&lt;/system&gt; &lt;subsystem&gt;13&lt;/subsystem&gt; &lt;subsubsystem&gt;60&lt;/subsubsystem&gt; &lt;status&gt;Checked Out&lt;/status&gt; &lt;notes&gt;-&lt;/notes&gt; &lt;currentUser&gt;JakeMemery&lt;/currentUser&gt; &lt;validator&gt;-&lt;/validator&gt; &lt;dateMod&gt;-&lt;/dateMod&gt; &lt;size&gt;-&lt;/size&gt; &lt;/dataModule&gt; &lt;dataModule&gt; &lt;DMC&gt;DMC-AJ-A-30-15-62-00AAA-066A-D_001-00.XML&lt;/DMC&gt; &lt;techName&gt;Pressure switch&lt;/techName&gt; &lt;infoName&gt;Support equipment and tools data&lt;/infoName&gt; &lt;system&gt;29&lt;/system&gt; &lt;subsystem&gt;13&lt;/subsystem&gt; &lt;subsubsystem&gt;54&lt;/subsubsystem&gt; &lt;status&gt;Checked In&lt;/status&gt; &lt;notes&gt;-&lt;/notes&gt; &lt;currentUser&gt;-&lt;/currentUser&gt; &lt;validator&gt;-&lt;/validator&gt; &lt;dateMod&gt;-&lt;/dateMod&gt; &lt;size&gt;-&lt;/size&gt; &lt;/dataModule&gt; &lt;dataModule&gt; &lt;DMC&gt;DMC-AJ-A-45-60-12-00AAA-420A-B_001-00.XML&lt;/DMC&gt; &lt;techName&gt;Pressure switch&lt;/techName&gt; &lt;infoName&gt;General fault isolation procedure&lt;/infoName&gt; &lt;system&gt;29&lt;/system&gt; &lt;subsystem&gt;20&lt;/subsystem&gt; &lt;subsubsystem&gt;10&lt;/subsubsystem&gt; &lt;status&gt;Checked In&lt;/status&gt; &lt;notes&gt;-&lt;/notes&gt; &lt;currentUser&gt;-&lt;/currentUser&gt; &lt;validator&gt;-&lt;/validator&gt; &lt;dateMod&gt;-&lt;/dateMod&gt; &lt;size&gt;-&lt;/size&gt; &lt;/dataModule&gt; &lt;/DMs&gt; </code></pre> <p>So as an example, i might pass in the value of 29 to my method. And as you can see the XML file above contains two 'System' 29 matches, but my program only retuns 1 of them - the first one.</p> <p>The method that calls the above and passes in the 'sys' variable is this:</p> <pre><code>public ListViewItem splitSNS(string fullSNSpath) { string sns = new String(fullSNSpath.ToCharArray().Where(c =&gt; Char.IsDigit(c)).ToArray()); if (sns.Length.ToString() == "6") { string sys = sns.Substring(4, 2); string subsys = sns.Substring(2, 2); string unit = sns.Substring(0, 2); ListViewItem dms = getDMcollection(sys, subsys, unit); return dms; } else if (sns.Length.ToString() == "4") { string sys = sns.Substring(2, 2); string subsys = sns.Substring(0, 2); ListViewItem dms = getDMcollection(sys, subsys); return dms; } else if (sns.Length.ToString() == "2") { string sys = sns.Substring(0, 2); ListViewItem dms = getDMcollection(sys); return dms; } return null; } </code></pre> <p>and an extract of the method which calls the above is </p> <pre><code> ListViewItem dms = newFilter.splitSNS(fullSNSpath); if (dms != null) { // showfilteredList(dms); listView1.Items.Add(dms); showStatus(dms); } else { MessageBox.Show("There are no DMs to be displayed"); } </code></pre>
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    1. COthis line here is probably the issue: where dm.Descendants("system").First().Value == sys as you are only asking for the First() item.
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