HtmlAgilityPack.HtmlNode.InsertBefore C# (CSharp) Method

		public HtmlNode InsertBefore(HtmlNode newChild, HtmlNode refChild)
		{
			if (newChild == null)
			{
				throw new ArgumentNullException("newChild");
			}

			if (refChild == null)
			{
				return AppendChild(newChild);
			}

			if (newChild == refChild)
			{
				return newChild;
			}

			int index = -1;

			if (_childnodes != null)
			{
				index = _childnodes[refChild];
			}

			if (index == -1)
			{
				throw new ArgumentException(HtmlDocument.HtmlExceptionRefNotChild);
			}

			_childnodes.Insert(index, newChild);

			_ownerdocument.SetIdForNode(newChild, newChild.GetId());
			_outerchanged = true;
			_innerchanged = true;
			return newChild;
		}