public HtmlNode ReplaceChild(HtmlNode newChild, HtmlNode oldChild)
{
if (newChild == null)
{
return(RemoveChild(oldChild));
}
if (oldChild == null)
{
return(AppendChild(newChild));
}
int index = -1;
if (_childnodes != null)
{
index = _childnodes[oldChild];
}
if (index == -1)
{
throw new ArgumentException(HtmlDocument.HtmlExceptionRefNotChild);
}
if (_childnodes != null)
{
_childnodes.Replace(index, newChild);
}
_ownerdocument.SetIdForNode(null, oldChild.GetId());
_ownerdocument.SetIdForNode(newChild, newChild.GetId());
_outerchanged = true;
_innerchanged = true;
return(newChild);
}
