Question

I would like to complete the below XML so all Parent elements have all 3 child elements.

<Parent>
  <Child1></Child1>
  <Child2></Child2>
  <Child3></Child3>
</Parent>
<Parent>
  <Child3></Child3>
</Parent>
<Parent>
  <Child1></Child1>
  <Child3></Child3>
</Parent>

So i got the below code

var elementsToChange = inputDoc.Descendants(CommonConstant.Parent);
foreach (var element in elementsToChange)
{
   if (element.Element(CommonConstant.Child1) == null) 
   { 
     //add child1 at 1
   }      
   if (element.Element(CommonConstant.Child2) == null) 
   { 
     //add child2 at 2
   }       
}

But i can’t find an Insert() or AddAT() on element. (and since i dont know what childs exist, using add afetr or before self are hard to use.)

Is there a way of adding a child at a certain location?

Answer 1

Try this:

foreach (var element in elementsToChange)
{
  XElement lastChild = null;
  foreach(var childName in Enumerable.Range(1, 3).Select(x => "Child" + x))
  {
    var child = element.Element(childName);
    if(child == null)
    {
      child = new XElement(childName);
      if(lastChild == null)
        element.AddFirst(child);
      else
      {
        lastChild.AddAfterSelf(child);
      }
    }
    lastChild = child;
  }
}