What is the fastest way to combine two xml files into one

Question

If I have two string of xml1 and xml2 which both represent xml in the same format. What is the fastest way to combine these together? The format is not important, but I just want to know how can I get rid off or ?

xml1 :

<?xml version="1.0" encoding="utf-8"?> <AllNodes>    <NodeA>       <NodeB>test1</NodeB>       <NodeB>test2</NodeB>    </NodeA> </AllNodes> 

xm2 :

<?xml version="1.0" encoding="utf-8"?> <AllNodes>    <NodeA>       <NodeB>test6</NodeB>       <NodeB>test7</NodeB>    </NodeA>    <NodeA>       <NodeB>test99</NodeB>       <NodeB>test23</NodeB>    </NodeA> </AllNodes> 

and have something like this :

<?xml version="1.0" encoding="utf-8"?>     <AllNodes>           <NodeA>               <NodeB>test1</NodeB>               <NodeB>test2</NodeB>           </NodeA>          <NodeA>               <NodeB>test6</NodeB>               <NodeB>test7</NodeB>            </NodeA>            <NodeA>               <NodeB>test99</NodeB>               <NodeB>test23</NodeB>            </NodeA>     </AllNodes> 

Answer 1

The easiest way to do this is using LINQ to XML. You can use either Union or Concat depending on your needs.

var xml1 = XDocument.Load("file1.xml"); var xml2 = XDocument.Load("file2.xml");  //Combine and remove duplicates var combinedUnique = xml1.Descendants("AllNodes")                           .Union(xml2.Descendants("AllNodes"));  //Combine and keep duplicates var combinedWithDups = xml1.Descendants("AllNodes")                            .Concat(xml2.Descendants("AllNodes")); 

Answer 2

An XSLT transformation could do it:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">   <xsl:param name="pXml1" select="''" />   <xsl:param name="pXml2" select="''" />   <xsl:param name="pRoot" select="'root'" />    <xsl:template match="/">     <xsl:variable name="vXml1" select="document($pXml1)" />     <xsl:variable name="vXml2" select="document($pXml2)" />      <xsl:element name="{$pRoot}">       <xsl:copy-of select="$vXml1/*/*" />       <xsl:copy-of select="$vXml2/*/*" />     </xsl:element>   </xsl:template>  </xsl:stylesheet> 

Pass in the names of the files as parameters, as well as the name of the new root element.

Apply to any XML document, e.g. an empty one.