XML: How to read one file into another

Question

I have a file: A.xml containing something like this:

<?xml version="1.0"?>
<headernode>

</headernode>

Inside of the headernode i need to be able to dynamically load the contents of another xml file called B.xml containing the following

<?xml version="1.0"?>
<token>
<a>0</a>
</token>

My question is how do i get the contents of B.xml inside the header node of a.xml?

Thanks!

Answer 1

This seems to work:

var header = XDocument.Load("a.xml");
var token = XElement.Load("b.xml");

var headerNode = header.Elements("headernode").First();
headerNode.Add(token);

Console.WriteLine(header.ToString()); 
/*
The above prints:

<headernode>
  <token>
    <a>0</a>
  </token>
</headernode>
*/

Answer 2

If you can use Linq to XML this would be relatively simple:

XDocument doc1 = XDocument.Load("a.xml");
XDocument doc2 = XDocument.Load("b.xml");

doc1.Element("headernode").Add(doc2.Root);

Answer 3

I prefer some of the other answers, but this was the first thing that came to mind:

var a = new XmlDocument();
a.Load("c:\\a.xml");
var b = new XmlDocument();
b.Load("c:\\b.xml");
var node = a.SelectSingleNode("/headernode");
node.AppendChild(a.ImportNode(b.SelectSingleNode("/token"), true));
a.Save("c:\\c.xml"); 

Answer 4

This XQuery:

declare function local:copy-append($element as element()) {
   if ($element instance of element(headernode))
   then
      element headernode {$element/@*,doc('B.xml')}
   else
      element {node-name($element)}
         {$element/@*,
          for $child in $element/node()
          return if ($child instance of element())
                 then local:copy-append($child)
                 else $child
         }
};
local:copy-append(/*)

Output:

<headernode>
    <token>
        <a>0</a>
    </token>
</headernode>

Answer 5

Well, I do not know the exact way to do it in C-Sharp, but basically wouldn't be the default approach to

1. load the DOM of A.xml
2. locate the headernode
3. load B.xml into DOM
4. resolve the root of DOM for B
5. copy root from DOM B
6. put it as child to the located headernode of DOM A
7. rewrite modified DOM A to file or whereever you want ?

Since Im a Java Developer I am not very familiar with the C-Sharp XML API but basically I've seen XMLDocument and XDocument there. And when I'm not wrong XDocument is newer and simpler, but both should do it somehow.

Does this help?

Answer 6

//myXmlToInsert.xml
/*
<?xml version="1.0"?>
<root>
  <child1></child1>
  <child2></child2>
  <token>
      <a>0</a>
  </token>
</root>
*/

//code
XDocument xmlDoc = new XDocument();
xmlDoc.Declaration = new XDeclaration("1.0", "utf-8", "yes");
xmlDoc.Document.Add(new XElement("rootNode",new XElement("headerNode"), new XElement("bodyNode")));
XDocument xmlToInsert = XDocument.Load(@"c:\myXmlToInsert.xml");
XElement tokenNode = xmlToInsert.Root.Element("token");

xmlDoc.Root.Element("headerNode").Add(tokenNode);    

//Result 
/*
<?xml version="1.0"?>
<root>
  <headerNode>
    <token>
       <a>0</a>
    </token>
   </headerNode>
   <bodyNode>
   </bodyNode>
</root>
*/