Add XElement to another XElement in specific location

Question

Please consider this XML:

<Employees>
    <Person>
        <ID>1000</ID>
        <Name>Nima</Name>
        <LName>Agha</LName>
    </Person>
    <Person>
        <ID>1002</ID>
        <Name>Ligha</Name>
        <LName>Ligha</LName>
    </Person>
    <Person>
        <ID>1003</ID>
        <Name>Jigha</Name>
        <LName>Jigha</LName>
    </Person>
</Employees>

That is content of a XElement variable.Now I have another XElement variable with this content:

<Person>
    <ID>1001</ID>
    <Name>Aba</Name>
    <LName>Aba</LName>
</Person>

I want to add this XEelemnt variable to first XElement in a specific position (for example as second Person tag). How I can do this?

thanks

Answer 1

First you need to load the xml string, second you get the position where you want to insert the xml, then insert the new xml. Here is an example how to do it.

var reader = new StringReader(@"<Employees>
    <Person>
        <ID>1000</ID>
        <Name>Nima</Name>
        <LName>Agha</LName>
    </Person>
    <Person>
        <ID>1002</ID>
        <Name>Ligha</Name>
        <LName>Ligha</LName>
    </Person>
    <Person>
        <ID>1003</ID>
        <Name>Jigha</Name>
        <LName>Jigha</LName>
    </Person>
</Employees>");
var xdoc = XDocument.Load(reader);
xdoc.Element("Employees").
   Elements("Person").
   First().
   AddAfterSelf(new XElement("Person", 
       new XElement("ID", 1001),
       new XElement("Name", "Aba"),
       new XElement("LName", "Aba")));

var sb = new StringBuilder();
var writer = new StringWriter(sb);
xdoc.Save(writer);
Console.WriteLine(sb);

UPDATE

If you want to insert by index, just get the element first. For example you want to insert as second position, then you need to get the first index (index = 0).

var xdoc = XDocument.Load(reader);
xdoc.Element("Employees").
    Elements("Person").
    ElementAt(0).
    AddAfterSelf(new XElement("Person", 
        new XElement("ID", 1001),
        new XElement("Name", "Aba"),
        new XElement("LName", "Aba")));

PS: For simplicity purpose I didn't add nullity check.