c#: how to know if the two element are in a row using xml linq

Question

i have this simple xml

<parent>
    <child>
      <son attribute="1"/>
      <sp>
      <son attribute="2"/>
      <sp>
    </child>
    <child>
      <another child>
        <son attribute ="3"/>
        <sp>
      </another child>
    </child>
    <child>
      <son attribute="5"/>
    </child>
</parent>

here is my code for now. actually i dont know what's next

XDocument doc = XDocument.Parse(string);
foreach (var el in doc.Descendants("child").ToList())
{
}

so the output will be

<parent>
        <child>
          <son attribute="1"/>
          <sp value="1">
          <son attribute="2"/>
          <sp value="2">
        </child>
        <child>
          <another child>
            <son attribute ="3"/>
            <sp value="3">
          </another child>
        </child>
        <child>
          <son attribute="5"/>
        </child>
    </parent>

my problem is how do i check if the son and sp tag are next to each other, if its next to each other, the sp tag will get the attribute value of the son tag

Answer 1

This is how you do it..

var xmldoc = XDocument.Parse(xml);
var getReadyForSp = false;
string sonvalue = "-1";

foreach (var ele1 in xmldoc.Element("parent").Elements("child"))
foreach (var element in ele1.Elements())
{
    if (element.Name == "son")
    {
        getReadyForSp = true;
        sonvalue = element.Attribute("attribute").Value;
    }
    if (getReadyForSp && element.Name == "sp")
    {
        XAttribute attribute = new XAttribute("value", sonvalue);
        element.Add(attribute);
        getReadyForSp = false;
    }

}

But you need to make sure sp element has valid format, which is <sp/>