public void AddBeforeSelf(HtmlNode content)
{
Requires.NotNull(content, nameof(content));
if (ReferenceEquals(this, content))
{
throw new InvalidOperationException("Cannot add a node as before itself.");
}
if (ReferenceEquals(this, content.Parent))
{
throw new InvalidOperationException("The node has already been added to this node.");
}
if (Parent == null)
{
throw new InvalidOperationException("This node does not have a parent.");
}
AddNodeBefore(Parent, this, content);
}
protected static void AddNodeBefore(HtmlElement parent, HtmlNode nextNode, HtmlNode node)
{
node.RemoveFromParent();
node.Parent = parent;
parent._nodes.AddBefore(nextNode, node);
}
protected static void AddNodeAfter(HtmlElement parent, HtmlNode previousNode, HtmlNode node)
{
node.RemoveFromParent();
node.Parent = parent;
parent._nodes.AddAfter(previousNode, node);
}