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POC# combine XML latest node only
 

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    <p>I've got two XML files, OriginalXML and UpdatesXML that I need to combine and retain only the latest changes. My users essentially get a copy of the OriginalXML, make edits then submit the updates to a web service. I need to only update the OriginalXML with nodes that are newer in the UpdatesXML.</p> <p>I can iterate over the nodes in the UpdatesXML, do a search of the OriginalXML for a match, check the timestamp and replace it if the updates is newer: (something like)</p> <pre><code>var OriginalXML = XDocument.Load("Original.xml"); var UpdatesXML = XDocument.Load("Updates.xml"); foreach (XElement WigitNode in UpdatesXML.Descendants("Wigit")) { //Find the corresponding OriginalXML node based on the Wigit/Subnode1/Id attribute //Replace Original/Wigit with Updates/Wigit if Updates/Wigit/Editstamp/Timestamp attribute is later in Updates than Original } </code></pre> <p>This whole thing seems rather clunky to me, especially if the Updates.xml has a lot of nodes. My use case is probably dozens at a time, so it may not be an issue, but it seems inefficient. Is there a straightforward XPath or xslt transform or something that would be faster or more efficient?</p> <p>My XML looks like this: Original.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;Root&gt; &lt;Wigit&gt; &lt;EditStamp UserId="timmy" Timestamp="2013-09-13T20:22:00" /&gt; &lt;Subnode1 Id="A" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="phil" Timestamp="2013-09-13T21:51:00" /&gt; &lt;Subnode1 Id="B" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="biff" Timestamp="2013-10-13T21:51:00" /&gt; &lt;Subnode1 Id="C" /&gt; &lt;/Wigit&gt; &lt;/Root&gt; </code></pre> <p>Updates.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;Root&gt; &lt;Wigit&gt; &lt;EditStamp UserId="frank" Timestamp="2013-10-13T22:00:00" /&gt; &lt;Subnode1 Id="A" /&gt; &lt;/Wigit&gt; &lt;/Root&gt; </code></pre> <p>And the desired output is:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;Root&gt; &lt;Wigit&gt; &lt;EditStamp UserId="frank" Timestamp="2013-10-13T22:00:00" /&gt; &lt;Subnode1 Id="A" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="phil" Timestamp="2013-09-13T21:51:00" /&gt; &lt;Subnode1 Id="B" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="biff" Timestamp="2013-10-13T21:51:00" /&gt; &lt;Subnode1 Id="C" /&gt; &lt;/Wigit&gt; &lt;/Root&gt; </code></pre> <p><strong>UPDATE: 10-15-2013</strong></p> <p>I did some fiddling using Abhijeet Patel's code below and came up with this:</p> <pre><code>var query = from o in docOriginal.Element("Root").Elements("Wigit") from u in docUpdate.Element("Root").Elements("Wigit") let x = docUpdate.Element("Root") .Elements("Wigit") .SingleOrDefault(e =&gt; (e.Element("Subnode1").Attribute("id").Value == o.Element("Subnode1").Attribute("id").Value &amp;&amp; DateTime.Parse(e.Element("EditStamp").Attribute("Timestamp").Value).Ticks &gt; DateTime.Parse(o.Element("EditStamp").Attribute("Timestamp").Value).Ticks)) ?? o select x; XDocument merged = new XDocument(new XElement("Root", query)); return merged; </code></pre> <p>This gives the proper result except that every node is duplicated:</p> <pre><code>&lt;Root&gt; &lt;Wigit&gt; &lt;EditStamp UserId="frank" Timestamp="2013-10-13T22:00:00" /&gt; &lt;Subnode1 Id="SomeNewThing" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="frank" Timestamp="2013-10-13T22:00:00" /&gt; &lt;Subnode1 Id="SomeNewThing" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="phil" Timestamp="2013-09-13T21:51:00" /&gt; &lt;Subnode1 Id="B" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="phil" Timestamp="2013-09-13T21:51:00" /&gt; &lt;Subnode1 Id="B" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="biff" Timestamp="2013-10-13T21:51:00" /&gt; &lt;Subnode1 Id="C" /&gt; &lt;/Wigit&gt; &lt;Wigit&gt; &lt;EditStamp UserId="biff" Timestamp="2013-10-13T21:51:00" /&gt; &lt;Subnode1 Id="C" /&gt; &lt;/Wigit&gt; &lt;/Root&gt; </code></pre> <p>Any hints on how to not duplicate the results?</p> <p><strong>Update 10-16-2013:</strong></p> <p>The reason I was getting duplicate results is because the Updates doc I was using had two nodes. The code needs to handle multiple changes at once, updating only the nodes with a greater timestamp.</p> <pre><code>string update = @"&lt;?xml version='1.0' encoding='utf-8'?&gt; &lt;Root&gt; &lt;Wigit id='A'&gt; &lt;EditStamp UserId='frank' Timestamp='2013-10-13T22:00:00' /&gt; &lt;Subnode1 Id='SomeNewThing' /&gt; &lt;/Wigit&gt; &lt;Wigit id='B'&gt; &lt;EditStamp UserId='yomamma' Timestamp='2013-09-10T21:51:00' /&gt; &lt;Subnode1 Id='B' /&gt; &lt;/Wigit&gt; &lt;/Root&gt;"; </code></pre>
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